diff --git a/.appveyor.yml b/.appveyor.yml
index 35847e4fc3727..1a14319db7c73 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -12,7 +12,6 @@ init:
     - SET SYMFONY_DEPRECATIONS_HELPER=strict
     - SET ANSICON=121x90 (121x90)
     - SET SYMFONY_PHPUNIT_DISABLE_RESULT_CACHE=1
-    - SET SYMFONY_DEPRECATIONS_HELPER=max[direct]=1
     - REG ADD "HKEY_CURRENT_USER\Software\Microsoft\Command Processor" /v DelayedExpansion /t REG_DWORD /d 1 /f
 
 install:
@@ -20,8 +19,8 @@ install:
     - appveyor DownloadFile https://github.com/symfony/binary-utils/releases/download/v0.1/php-7.2.5-Win32-VC15-x86.zip
     - 7z x php-7.2.5-Win32-VC15-x86.zip -y >nul
     - cd ext
-    - appveyor DownloadFile https://github.com/symfony/binary-utils/releases/download/v0.1/php_apcu-5.1.17-7.2-ts-vc15-x86.zip
-    - 7z x php_apcu-5.1.17-7.2-ts-vc15-x86.zip -y >nul
+    - appveyor DownloadFile https://github.com/symfony/binary-utils/releases/download/v0.1/php_apcu-5.1.19-7.2-ts-vc15-x86.zip
+    - 7z x php_apcu-5.1.19-7.2-ts-vc15-x86.zip -y >nul
     - cd ..
     - copy /Y php.ini-development php.ini-min
     - echo memory_limit=-1 >> php.ini-min
diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index c4559a084a466..0820ae8d918b3 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -157,7 +157,6 @@ jobs:
       - name: Run tests
         run: ./phpunit --group integration -v
         env:
-          SYMFONY_DEPRECATIONS_HELPER: max[direct]=1 # to be removed once DbalLogger is compatible with dbal 3.2+
           REDIS_HOST: localhost
           REDIS_CLUSTER_HOSTS: 'localhost:7000 localhost:7001 localhost:7002 localhost:7003 localhost:7004 localhost:7005'
           REDIS_SENTINEL_HOSTS: 'localhost:26379'
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 685d08e1b1d9d..c60d92ba61cce 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -63,7 +63,6 @@ jobs:
           echo COLUMNS=120 >> $GITHUB_ENV
           echo PHPUNIT="$(readlink -f ./phpunit) --exclude-group tty,benchmark,intl-data" >> $GITHUB_ENV
           echo COMPOSER_UP='composer update --no-progress --ansi' >> $GITHUB_ENV
-          echo SYMFONY_DEPRECATIONS_HELPER=max[direct]=1 >> $GITHUB_ENV # to be removed once DbalLogger is compatible with dbal 3.2+
 
           SYMFONY_VERSIONS=$(git ls-remote -q --heads | cut -f2 | grep -o '/[1-9][0-9]*\.[0-9].*' | sort -V)
           SYMFONY_VERSION=$(grep ' VERSION = ' src/Symfony/Component/HttpKernel/Kernel.php | grep -P -o '[0-9]+\.[0-9]+')
diff --git a/CHANGELOG-5.3.md b/CHANGELOG-5.3.md
index f73800bc11f80..ceeefa8cad098 100644
--- a/CHANGELOG-5.3.md
+++ b/CHANGELOG-5.3.md
@@ -7,6 +7,15 @@ in 5.3 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v5.3.0...v5.3.1
 
+* 5.3.12 (2021-11-24)
+
+ * security #cve-2021-41268 [SecurityBundle] Default signature_properties to the previous behavior (wouterj)
+ * security #cve-2021-41267 [HttpKernel] Fix missing extra trusted header in sub-request (jderusse)
+ * security #cve-2021-41270 [Serializer] Use single quote to escape formulas (jderusse)
+ * bug #44232 [Cache] fix connecting to local Redis sockets (nicolas-grekas)
+ * bug #44204 [HttpClient] fix closing curl multi handle when destructing client (nicolas-grekas)
+ * bug #44208 [Process] exclude argv/argc from possible default env vars (nicolas-grekas)
+
 * 5.3.11 (2021-11-22)
 
  * bug #44188 [VarExporter] fix exporting declared but unset properties when __sleep() is implemented (nicolas-grekas)
diff --git a/CHANGELOG-5.4.md b/CHANGELOG-5.4.md
index 98ea5ab9c9e74..5ba6dab3b6129 100644
--- a/CHANGELOG-5.4.md
+++ b/CHANGELOG-5.4.md
@@ -7,6 +7,20 @@ in 5.4 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v5.4.0...v5.4.1
 
+* 5.4.0 (2021-11-29)
+
+ * bug #44309 [Messenger] Leverage DBAL's getNativeConnection() method (derrabus)
+ * bug #44300 [FrameworkBundle] Fix property-info phpstan extractor discovery (1ed)
+ * feature #44271 [Notifier] add Vonage bridge to replace the Nexmo one (nicolas-grekas)
+ * bug #44187 [Translation] [Loco] Fix idempotency of LocoProvider write method (welcoMattic)
+ * bug #43992 [Security] Do not overwrite already stored tokens for REMOTE_USER authentication (stlrnz)
+ * bug #43876 [Validator] Fix validation for single level domains (HypeMC)
+ * bug #44327 [Debug][ErrorHandler] Increased the reserved memory from 10k to 32k (sakalys)
+ * bug #44261 [Process] intersect with getenv() in case-insensitive manner to get default envs (stable-staple)
+ * bug #44295 [Serializer] fix support for lazy/unset properties (nicolas-grekas)
+ * bug #44277 [Notifier] Fix AllMySms bridge body content (afiocre)
+ * bug #44269 [DoctrineBridge] Revert " add support for the JSON type" (dunglas)
+
 * 5.4.0-RC1 (2021-11-24)
 
  * security #cve-2021-41268 [SecurityBundle] Default signature_properties to the previous behavior (wouterj)
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 92b9b528b9c50..b5e87ad1280f4 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -12,8 +12,8 @@ The Symfony Connect username in parenthesis allows to get more information
  - Tobias Schultze (tobion)
  - Robin Chalas (chalas_r)
  - Christophe Coevoet (stof)
- - Wouter De Jong (wouterj)
  - Jérémy DERUSSÉ (jderusse)
+ - Wouter De Jong (wouterj)
  - Grégoire Pineau (lyrixx)
  - Maxime Steinhausser (ogizanagi)
  - Kévin Dunglas (dunglas)
@@ -58,9 +58,9 @@ The Symfony Connect username in parenthesis allows to get more information
  - Diego Saint Esteben (dosten)
  - Grégoire Paris (greg0ire)
  - Alexandre Salomé (alexandresalome)
+ - Jérôme Tamarelle (gromnan)
  - William Durand (couac)
  - ornicar
- - Jérôme Tamarelle (gromnan)
  - Konstantin Myakshin (koc)
  - Dany Maillard (maidmaid)
  - Francis Besset (francisbesset)
@@ -116,11 +116,11 @@ The Symfony Connect username in parenthesis allows to get more information
  - John Wards (johnwards)
  - Tomas Norkūnas (norkunas)
  - Baptiste Clavié (talus)
+ - HypeMC (hypemc)
  - Antoine Hérault (herzult)
  - Paráda József (paradajozsef)
  - Alexandre Daubois (alexandre-daubois)
  - Vincent Langlet (deviling)
- - HypeMC (hypemc)
  - Massimiliano Arione (garak)
  - Arnaud Le Blanc (arnaud-lb)
  - Przemysław Bogusz (przemyslaw-bogusz)
@@ -825,6 +825,7 @@ The Symfony Connect username in parenthesis allows to get more information
  - Rodrigo Borrego Bernabé (rodrigobb)
  - Emanuele Iannone
  - Jörn Lang (j.lang)
+ - Petr Duda (petrduda)
  - Marcos Rezende (rezehnde)
  - Denis Gorbachev (starfall)
  - Peter van Dommelen
@@ -1350,7 +1351,6 @@ The Symfony Connect username in parenthesis allows to get more information
  - Simon Leblanc (leblanc_simon)
  - Matthieu Mota (matthieumota)
  - Mikhail Prosalov (mprosalov)
- - Petr Duda (petrduda)
  - Ronny López (ronnylt)
  - abdul malik ikhsan (samsonasik)
  - Henry Snoek (snoek09)
diff --git a/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php b/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
index d37a90fa4a20f..6474440f9acb9 100644
--- a/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
+++ b/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
@@ -75,7 +75,7 @@ public static function createChoiceLabel(object $choice): string
      */
     public static function createChoiceName(object $choice, $key, string $value): string
     {
-        return str_replace('-', '_', (string) $value);
+        return str_replace('-', '_', $value);
     }
 
     /**
diff --git a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
index c1eeb5e3ded96..8148ce0d3882d 100644
--- a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
+++ b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
@@ -168,7 +168,6 @@ public function getTypes(string $class, string $property, array $context = [])
                     switch ($typeOfField) {
                         case Types::ARRAY:
                         case 'json_array':
-                        case 'json':
                             return [new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true)];
 
                         case Types::SIMPLE_ARRAY:
@@ -283,7 +282,6 @@ private function getPhpType(string $doctrineType): ?string
             case Types::ARRAY:
             case Types::SIMPLE_ARRAY:
             case 'json_array':
-            case 'json':
                 return Type::BUILTIN_TYPE_ARRAY;
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php b/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php
index d79b7d4998134..710e87a15e0b8 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php
@@ -15,6 +15,9 @@
 use Psr\Log\LoggerInterface;
 use Symfony\Bridge\Doctrine\Logger\DbalLogger;
 
+/**
+ * @group legacy
+ */
 class DbalLoggerTest extends TestCase
 {
     /**
@@ -46,8 +49,8 @@ public function getLogFixtures()
             ['SQL', null, []],
             ['SQL', [], []],
             ['SQL', ['foo' => 'bar'], ['foo' => 'bar']],
-            ['SQL', ['foo' => "\x7F\xFF"], ['foo' => DbalLogger::BINARY_DATA_VALUE]],
-            ['SQL', ['foo' => "bar\x7F\xFF"], ['foo' => DbalLogger::BINARY_DATA_VALUE]],
+            ['SQL', ['foo' => "\x7F\xFF"], ['foo' => '(binary value)']],
+            ['SQL', ['foo' => "bar\x7F\xFF"], ['foo' => '(binary value)']],
             ['SQL', ['foo' => ''], ['foo' => '']],
         ];
     }
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
index 3f0fb80ab04ce..3b9419d174a60 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
@@ -207,7 +207,7 @@ public function typesProvider()
                 new Type(Type::BUILTIN_TYPE_INT),
                 new Type(Type::BUILTIN_TYPE_OBJECT, false, DoctrineRelation::class)
             )]],
-            ['json', [new Type(Type::BUILTIN_TYPE_ARRAY, true, null, true)]],
+            ['json', null],
         ];
 
         return $provider;
diff --git a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php
index 99248c508ccab..4420ef3d0e46c 100644
--- a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php
+++ b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php
@@ -107,7 +107,7 @@ private function __construct(array $thresholds = [], $regex = '', $verboseOutput
             if (!isset($this->verboseOutput[$group])) {
                 throw new \InvalidArgumentException(sprintf('Unsupported verbosity group "%s", expected one of "%s".', $group, implode('", "', array_keys($this->verboseOutput))));
             }
-            $this->verboseOutput[$group] = (bool) $status;
+            $this->verboseOutput[$group] = $status;
         }
 
         if ($generateBaseline && !$baselineFile) {
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
index 2eb1bbce038c6..a0953a2d9f346 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
@@ -57,7 +57,7 @@ protected function setUp(): void
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -66,42 +66,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
index 6c84b32038b6e..b02d859f74856 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
@@ -107,7 +107,7 @@ public function testMoneyWidgetInIso()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -116,42 +116,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
index 5dbb7e5b6c8b8..33e1862afd74a 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
@@ -59,7 +59,7 @@ protected function setUp(): void
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -68,42 +68,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
index 285aa066e691d..41985a8ce2d85 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
@@ -111,7 +111,7 @@ public function testMoneyWidgetInIso()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -120,42 +120,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5HorizontalLayoutTest.php
index 042cbf0e40a7e..ef924884a4751 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5HorizontalLayoutTest.php
@@ -59,7 +59,7 @@ protected function setUp(): void
 
     protected function renderForm(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = []): string
@@ -68,42 +68,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = []):
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true): void
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5LayoutTest.php
index 1bf4a315fab0b..8c0e54744f964 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap5LayoutTest.php
@@ -111,7 +111,7 @@ public function testMoneyWidgetInIso()
 
     protected function renderForm(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = []): string
@@ -120,42 +120,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = []):
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = []): string
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true): void
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
index 3190b4cb74bed..69f0c8f680933 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
@@ -331,7 +331,7 @@ public function testLabelHtmlIsTrue()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -340,42 +340,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
index 48811750a82e0..b70a250e19639 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
@@ -217,7 +217,7 @@ public function testLabelHtmlIsTrue()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -226,42 +226,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php
index 523c481a4ba06..cfc9ae2fbee4c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php
@@ -14,12 +14,15 @@
 use Psr\Container\ContainerInterface;
 use Symfony\Bundle\FrameworkBundle\Console\Helper\DescriptorHelper;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\Service\ServiceProviderInterface;
 
 /**
  * A console command for retrieving information about event dispatcher.
@@ -120,6 +123,31 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         return 0;
     }
 
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($input->mustSuggestArgumentValuesFor('event')) {
+            $dispatcherServiceName = $input->getOption('dispatcher');
+            if ($this->dispatchers->has($dispatcherServiceName)) {
+                $dispatcher = $this->dispatchers->get($dispatcherServiceName);
+                $suggestions->suggestValues(array_keys($dispatcher->getListeners()));
+            }
+
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('dispatcher')) {
+            if ($this->dispatchers instanceof ServiceProviderInterface) {
+                $suggestions->suggestValues(array_keys($this->dispatchers->getProvidedServices()));
+            }
+
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('format')) {
+            $suggestions->suggestValues((new DescriptorHelper())->getFormats());
+        }
+    }
+
     private function searchForEvent(EventDispatcherInterface $dispatcher, string $needle): array
     {
         $output = [];
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 22517ad5c7d3f..9b761dbdd3934 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -16,6 +16,7 @@
 use Doctrine\Common\Annotations\Reader;
 use Http\Client\HttpClient;
 use phpDocumentor\Reflection\DocBlockFactoryInterface;
+use phpDocumentor\Reflection\Types\ContextFactory;
 use PHPStan\PhpDocParser\Parser\PhpDocParser;
 use Psr\Cache\CacheItemPoolInterface;
 use Psr\Container\ContainerInterface as PsrContainerInterface;
@@ -157,6 +158,7 @@
 use Symfony\Component\Notifier\Bridge\Telnyx\TelnyxTransportFactory;
 use Symfony\Component\Notifier\Bridge\TurboSms\TurboSmsTransport;
 use Symfony\Component\Notifier\Bridge\Twilio\TwilioTransportFactory;
+use Symfony\Component\Notifier\Bridge\Vonage\VonageTransportFactory;
 use Symfony\Component\Notifier\Bridge\Yunpian\YunpianTransportFactory;
 use Symfony\Component\Notifier\Bridge\Zulip\ZulipTransportFactory;
 use Symfony\Component\Notifier\Notifier;
@@ -1849,7 +1851,7 @@ private function registerPropertyInfoConfiguration(ContainerBuilder $container,
 
         if (
             ContainerBuilder::willBeAvailable('phpstan/phpdoc-parser', PhpDocParser::class, ['symfony/framework-bundle', 'symfony/property-info'], true)
-            && ContainerBuilder::willBeAvailable('phpdocumentor/type-resolver', PhpDocParser::class, ['symfony/framework-bundle', 'symfony/property-info'], true)
+            && ContainerBuilder::willBeAvailable('phpdocumentor/type-resolver', ContextFactory::class, ['symfony/framework-bundle', 'symfony/property-info'], true)
         ) {
             $definition = $container->register('property_info.phpstan_extractor', PhpStanExtractor::class);
             $definition->addTag('property_info.type_extractor', ['priority' => -1000]);
@@ -2540,6 +2542,7 @@ private function registerNotifierConfiguration(array $config, ContainerBuilder $
             TelnyxTransportFactory::class => 'notifier.transport_factory.telnyx',
             TurboSmsTransport::class => 'notifier.transport_factory.turbo-sms',
             TwilioTransportFactory::class => 'notifier.transport_factory.twilio',
+            VonageTransportFactory::class => 'notifier.transport_factory.vonage',
             YunpianTransportFactory::class => 'notifier.transport_factory.yunpian',
             ZulipTransportFactory::class => 'notifier.transport_factory.zulip',
         ];
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/notifier_transports.php b/src/Symfony/Bundle/FrameworkBundle/Resources/config/notifier_transports.php
index 18620b30832cb..8e3bb4ce2abed 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/notifier_transports.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/notifier_transports.php
@@ -52,6 +52,7 @@
 use Symfony\Component\Notifier\Bridge\Telnyx\TelnyxTransportFactory;
 use Symfony\Component\Notifier\Bridge\TurboSms\TurboSmsTransportFactory;
 use Symfony\Component\Notifier\Bridge\Twilio\TwilioTransportFactory;
+use Symfony\Component\Notifier\Bridge\Vonage\VonageTransportFactory;
 use Symfony\Component\Notifier\Bridge\Yunpian\YunpianTransportFactory;
 use Symfony\Component\Notifier\Bridge\Zulip\ZulipTransportFactory;
 use Symfony\Component\Notifier\Transport\AbstractTransportFactory;
@@ -109,6 +110,11 @@
         ->set('notifier.transport_factory.nexmo', NexmoTransportFactory::class)
             ->parent('notifier.transport_factory.abstract')
             ->tag('texter.transport_factory')
+            ->deprecate('symfony/framework-bundle', '5.4', 'The "%service_id% service is deprecated, use "notifier.transport_factory.vonage" instead.')
+
+        ->set('notifier.transport_factory.vonage', VonageTransportFactory::class)
+            ->parent('notifier.transport_factory.abstract')
+            ->tag('texter.transport_factory')
 
         ->set('notifier.transport_factory.rocket-chat', RocketChatTransportFactory::class)
             ->parent('notifier.transport_factory.abstract')
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/EventDispatcherDebugCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/EventDispatcherDebugCommandTest.php
new file mode 100644
index 0000000000000..ce653c6bfaaaa
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/EventDispatcherDebugCommandTest.php
@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Command\EventDispatcherDebugCommand;
+use Symfony\Component\Console\Tester\CommandCompletionTester;
+use Symfony\Component\DependencyInjection\ServiceLocator;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+
+class EventDispatcherDebugCommandTest extends TestCase
+{
+    /**
+     * @dataProvider provideCompletionSuggestions
+     */
+    public function testComplete(array $input, array $expectedSuggestions)
+    {
+        $tester = $this->createCommandCompletionTester();
+
+        $suggestions = $tester->complete($input);
+
+        $this->assertSame($expectedSuggestions, $suggestions);
+    }
+
+    public function provideCompletionSuggestions()
+    {
+        yield 'event' => [[''], ['Symfony\Component\Mailer\Event\MessageEvent', 'console.command']];
+        yield 'event for other dispatcher' => [['--dispatcher', 'other_event_dispatcher', ''], ['other_event', 'App\OtherEvent']];
+        yield 'dispatcher' => [['--dispatcher='], ['event_dispatcher', 'other_event_dispatcher']];
+        yield 'format' => [['--format='], ['txt', 'xml', 'json', 'md']];
+    }
+
+    private function createCommandCompletionTester(): CommandCompletionTester
+    {
+        $dispatcher = new EventDispatcher();
+        $otherDispatcher = new EventDispatcher();
+
+        $dispatcher->addListener('event', ['Listener']);
+        $otherDispatcher->addListener('other_event', ['OtherListener']);
+
+        $dispatchers = new ServiceLocator([
+            'event_dispatcher' => function () {
+                $dispatcher = new EventDispatcher();
+                $dispatcher->addListener('Symfony\Component\Mailer\Event\MessageEvent', 'var_dump');
+                $dispatcher->addListener('console.command', 'var_dump');
+
+                return $dispatcher;
+            },
+            'other_event_dispatcher' => function () {
+                $dispatcher = new EventDispatcher();
+                $dispatcher->addListener('other_event', 'var_dump');
+                $dispatcher->addListener('App\OtherEvent', 'var_dump');
+
+                return $dispatcher;
+            },
+        ]);
+        $command = new EventDispatcherDebugCommand($dispatchers);
+
+        return new CommandCompletionTester($command);
+    }
+}
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
index 9774c219f1cb3..6fe970f366f3f 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
@@ -1059,7 +1059,7 @@ private function createExpression(ContainerBuilder $container, string $expressio
     private function createRequestMatcher(ContainerBuilder $container, string $path = null, string $host = null, int $port = null, array $methods = [], array $ips = null, array $attributes = []): Reference
     {
         if ($methods) {
-            $methods = array_map('strtoupper', (array) $methods);
+            $methods = array_map('strtoupper', $methods);
         }
 
         if (null !== $ips) {
diff --git a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
index 06f434457771b..6aff151cc8bb8 100644
--- a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
+++ b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
@@ -38,7 +38,7 @@ public function __construct(string $resource, bool $exists = null)
     {
         $this->resource = $resource;
         if (null !== $exists) {
-            $this->exists = [(bool) $exists, null];
+            $this->exists = [$exists, null];
         }
     }
 
diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index 196d44f07edce..9f32b5a62a33f 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -239,12 +239,12 @@ public static function phpize($value)
                 $raw = $value;
                 $cast = (int) $value;
 
-                return '0' == $value[0] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
+                return '0' == $value[0] ? octdec($value) : (($raw === (string) $cast) ? $cast : $raw);
             case isset($value[1]) && '-' === $value[0] && ctype_digit(substr($value, 1)):
                 $raw = $value;
                 $cast = (int) $value;
 
-                return '0' == $value[1] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
+                return '0' == $value[1] ? octdec($value) : (($raw === (string) $cast) ? $cast : $raw);
             case 'true' === $lowercaseValue:
                 return true;
             case 'false' === $lowercaseValue:
diff --git a/src/Symfony/Component/Console/Question/Question.php b/src/Symfony/Component/Console/Question/Question.php
index 0e5202775b187..3a73f04b2383d 100644
--- a/src/Symfony/Component/Console/Question/Question.php
+++ b/src/Symfony/Component/Console/Question/Question.php
@@ -127,7 +127,7 @@ public function isHiddenFallback()
      */
     public function setHiddenFallback(bool $fallback)
     {
-        $this->hiddenFallback = (bool) $fallback;
+        $this->hiddenFallback = $fallback;
 
         return $this;
     }
diff --git a/src/Symfony/Component/DependencyInjection/Definition.php b/src/Symfony/Component/DependencyInjection/Definition.php
index b30137cc9859d..7fc6752554f70 100644
--- a/src/Symfony/Component/DependencyInjection/Definition.php
+++ b/src/Symfony/Component/DependencyInjection/Definition.php
@@ -146,7 +146,7 @@ public function setDecoratedService(?string $id, string $renamedId = null, int $
         if (null === $id) {
             $this->decoratedService = null;
         } else {
-            $this->decoratedService = [$id, $renamedId, (int) $priority];
+            $this->decoratedService = [$id, $renamedId, $priority];
 
             if (ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE !== $invalidBehavior) {
                 $this->decoratedService[] = $invalidBehavior;
diff --git a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index 0d5c36e14e916..d0a016f06a866 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -214,7 +214,7 @@ private function parseDefinition(\DOMElement $service, string $file, Definition
         if ($alias = $service->getAttribute('alias')) {
             $this->validateAlias($service, $file);
 
-            $this->container->setAlias((string) $service->getAttribute('id'), $alias = new Alias($alias));
+            $this->container->setAlias($service->getAttribute('id'), $alias = new Alias($alias));
             if ($publicAttr = $service->getAttribute('public')) {
                 $alias->setPublic(XmlUtils::phpize($publicAttr));
             } elseif ($defaults->getChanges()['public'] ?? false) {
@@ -352,7 +352,7 @@ private function parseDefinition(\DOMElement $service, string $file, Definition
             }
 
             if ('' === $tagName && '' === $tagName = $tag->getAttribute('name')) {
-                throw new InvalidArgumentException(sprintf('The tag name for service "%s" in "%s" must be a non-empty string.', (string) $service->getAttribute('id'), $file));
+                throw new InvalidArgumentException(sprintf('The tag name for service "%s" in "%s" must be a non-empty string.', $service->getAttribute('id'), $file));
             }
 
             $definition->addTag($tagName, $parameters);
@@ -382,7 +382,7 @@ private function parseDefinition(\DOMElement $service, string $file, Definition
             } elseif ('null' === $decorationOnInvalid) {
                 $invalidBehavior = ContainerInterface::NULL_ON_INVALID_REFERENCE;
             } else {
-                throw new InvalidArgumentException(sprintf('Invalid value "%s" for attribute "decoration-on-invalid" on service "%s". Did you mean "exception", "ignore" or "null" in "%s"?', $decorationOnInvalid, (string) $service->getAttribute('id'), $file));
+                throw new InvalidArgumentException(sprintf('Invalid value "%s" for attribute "decoration-on-invalid" on service "%s". Did you mean "exception", "ignore" or "null" in "%s"?', $decorationOnInvalid, $service->getAttribute('id'), $file));
             }
 
             $renameId = $service->hasAttribute('decoration-inner-name') ? $service->getAttribute('decoration-inner-name') : null;
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
index 2c885e3393b92..b1bf77568d4ac 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
@@ -109,7 +109,7 @@ public function set(string $name, $value)
      */
     public function has(string $name)
     {
-        return \array_key_exists((string) $name, $this->parameters);
+        return \array_key_exists($name, $this->parameters);
     }
 
     /**
diff --git a/src/Symfony/Component/ErrorHandler/ErrorHandler.php b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
index 1abafc15289f9..87e508405b734 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorHandler.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
@@ -111,7 +111,7 @@ class ErrorHandler
     public static function register(self $handler = null, bool $replace = true): self
     {
         if (null === self::$reservedMemory) {
-            self::$reservedMemory = str_repeat('x', 10240);
+            self::$reservedMemory = str_repeat('x', 32768);
             register_shutdown_function(__CLASS__.'::handleFatalError');
         }
 
@@ -348,7 +348,7 @@ public function scopeAt(int $levels, bool $replace = false): int
     public function traceAt(int $levels, bool $replace = false): int
     {
         $prev = $this->tracedErrors;
-        $this->tracedErrors = (int) $levels;
+        $this->tracedErrors = $levels;
         if (!$replace) {
             $this->tracedErrors |= $prev;
         }
diff --git a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
index 7e389273f9f42..27589cdd5f57a 100644
--- a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
@@ -64,7 +64,7 @@ public function current()
         // the logic here avoids redoing the same work in all iterations
 
         if (null === $subPathname = $this->subPath) {
-            $subPathname = $this->subPath = (string) $this->getSubPath();
+            $subPathname = $this->subPath = $this->getSubPath();
         }
         if ('' !== $subPathname) {
             $subPathname .= $this->directorySeparator;
diff --git a/src/Symfony/Component/Form/AbstractRendererEngine.php b/src/Symfony/Component/Form/AbstractRendererEngine.php
index 55917de1338c4..5641c420e28c4 100644
--- a/src/Symfony/Component/Form/AbstractRendererEngine.php
+++ b/src/Symfony/Component/Form/AbstractRendererEngine.php
@@ -68,7 +68,7 @@ public function setTheme(FormView $view, $themes, bool $useDefaultThemes = true)
 
         // Do not cast, as casting turns objects into arrays of properties
         $this->themes[$cacheKey] = \is_array($themes) ? $themes : [$themes];
-        $this->useDefaultThemes[$cacheKey] = (bool) $useDefaultThemes;
+        $this->useDefaultThemes[$cacheKey] = $useDefaultThemes;
 
         // Unset instead of resetting to an empty array, in order to allow
         // implementations (like TwigRendererEngine) to check whether $cacheKey
diff --git a/src/Symfony/Component/Form/FormFactory.php b/src/Symfony/Component/Form/FormFactory.php
index 959f6bcf782a8..b3185d1a376c6 100644
--- a/src/Symfony/Component/Form/FormFactory.php
+++ b/src/Symfony/Component/Form/FormFactory.php
@@ -66,7 +66,7 @@ public function createNamedBuilder(string $name, string $type = FormType::class,
 
         $type = $this->registry->getType($type);
 
-        $builder = $type->createBuilder($this, (string) $name, $options);
+        $builder = $type->createBuilder($this, $name, $options);
 
         // Explicitly call buildForm() in order to be able to override either
         // createBuilder() or buildForm() in the resolved form type
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index a5ad4df6d5b38..10e91ca1be30d 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1969,7 +1969,7 @@ protected function preparePathInfo()
             return '/';
         }
 
-        return (string) $pathInfo;
+        return $pathInfo;
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php b/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php
index 2707d64ec7138..8aab3a1228edd 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php
@@ -78,7 +78,7 @@ public function peek(string $type, array $default = [])
      */
     public function peekAll()
     {
-        return \array_key_exists('display', $this->flashes) ? (array) $this->flashes['display'] : [];
+        return \array_key_exists('display', $this->flashes) ? $this->flashes['display'] : [];
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php
index 5535bc96441db..9b0cdeb7fe1d0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php
@@ -21,7 +21,7 @@ class SessionHandlerProxy extends AbstractProxy implements \SessionHandlerInterf
     public function __construct(\SessionHandlerInterface $handler)
     {
         $this->handler = $handler;
-        $this->wrapper = ($handler instanceof \SessionHandler);
+        $this->wrapper = $handler instanceof \SessionHandler;
         $this->saveHandlerName = $this->wrapper ? ini_get('session.save_handler') : 'user';
     }
 
@@ -41,7 +41,7 @@ public function getHandler()
     #[\ReturnTypeWillChange]
     public function open($savePath, $sessionName)
     {
-        return (bool) $this->handler->open($savePath, $sessionName);
+        return $this->handler->open($savePath, $sessionName);
     }
 
     /**
@@ -50,16 +50,16 @@ public function open($savePath, $sessionName)
     #[\ReturnTypeWillChange]
     public function close()
     {
-        return (bool) $this->handler->close();
+        return $this->handler->close();
     }
 
     /**
-     * @return string
+     * @return string|false
      */
     #[\ReturnTypeWillChange]
     public function read($sessionId)
     {
-        return (string) $this->handler->read($sessionId);
+        return $this->handler->read($sessionId);
     }
 
     /**
@@ -68,7 +68,7 @@ public function read($sessionId)
     #[\ReturnTypeWillChange]
     public function write($sessionId, $data)
     {
-        return (bool) $this->handler->write($sessionId, $data);
+        return $this->handler->write($sessionId, $data);
     }
 
     /**
@@ -77,7 +77,7 @@ public function write($sessionId, $data)
     #[\ReturnTypeWillChange]
     public function destroy($sessionId)
     {
-        return (bool) $this->handler->destroy($sessionId);
+        return $this->handler->destroy($sessionId);
     }
 
     /**
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index 6bb0b1808d80f..523f5c957f188 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -163,7 +163,7 @@ public function collect(Request $request, Response $response, \Throwable $except
                     'method' => $request->getMethod(),
                     'controller' => $this->parseController($request->attributes->get('_controller')),
                     'status_code' => $statusCode,
-                    'status_text' => Response::$statusTexts[(int) $statusCode],
+                    'status_text' => Response::$statusTexts[$statusCode],
                 ]),
                 0, '/', null, $request->isSecure(), true, false, 'lax'
             ));
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index f55f5f693dcec..656324a4df7e8 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -78,12 +78,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
      */
     private static $freshCache = [];
 
-    public const VERSION = '5.4.0-RC1';
+    public const VERSION = '5.4.0';
     public const VERSION_ID = 50400;
     public const MAJOR_VERSION = 5;
     public const MINOR_VERSION = 4;
     public const RELEASE_VERSION = 0;
-    public const EXTRA_VERSION = 'RC1';
+    public const EXTRA_VERSION = '';
 
     public const END_OF_MAINTENANCE = '11/2024';
     public const END_OF_LIFE = '11/2025';
diff --git a/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php b/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
index 30479fd3878b1..96b36f97e2a80 100644
--- a/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
+++ b/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
@@ -666,12 +666,12 @@ public function parseProvider()
         return [
             ['prefix1', false, '->parse() does not parse a number with a string prefix.', 0],
             ['prefix1', false, '->parse() does not parse a number with a string prefix.', 0, false],
-            ['1.4suffix', (float) 1.4, '->parse() parses a number with a string suffix.', 3],
-            ['1.4suffix', (float) 1.4, '->parse() parses a number with a string suffix.', 3, false],
+            ['1.4suffix', 1.4, '->parse() parses a number with a string suffix.', 3],
+            ['1.4suffix', 1.4, '->parse() parses a number with a string suffix.', 3, false],
             ['1,234.4suffix', 1234.4, '->parse() parses a number with a string suffix.', 7],
             ['1,234.4suffix', 1.0, '->parse() parses a number with a string suffix.', 1, false],
-            ['-.4suffix', (float) -0.4, '->parse() parses a negative dot float with suffix.', 3],
-            ['-.4suffix', (float) -0.4, '->parse() parses a negative dot float with suffix.', 3, false],
+            ['-.4suffix', -0.4, '->parse() parses a negative dot float with suffix.', 3],
+            ['-.4suffix', -0.4, '->parse() parses a negative dot float with suffix.', 3, false],
             [',4', false, '->parse() does not parse when invalid grouping used.', 0],
             [',4', false, '->parse() does not parse when invalid grouping used.', 0, false],
             ['123,4', false, '->parse() does not parse when invalid grouping used.', 0],
diff --git a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php
index 3106ba3ce4aa0..ff6d4d9f6a023 100644
--- a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php
+++ b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php
@@ -72,7 +72,7 @@ public function escape(string $subject, string $ignore = '', int $flags = 0)
         $value = ldap_escape($subject, $ignore, $flags);
 
         // Per RFC 4514, leading/trailing spaces should be encoded in DNs, as well as carriage returns.
-        if ((int) $flags & \LDAP_ESCAPE_DN) {
+        if ($flags & \LDAP_ESCAPE_DN) {
             if (!empty($value) && ' ' === $value[0]) {
                 $value = '\\20'.substr($value, 1);
             }
diff --git a/src/Symfony/Component/Messenger/Bridge/Doctrine/Transport/PostgreSqlConnection.php b/src/Symfony/Component/Messenger/Bridge/Doctrine/Transport/PostgreSqlConnection.php
index 4c221b7e4d4db..130ca0f9b4195 100644
--- a/src/Symfony/Component/Messenger/Bridge/Doctrine/Transport/PostgreSqlConnection.php
+++ b/src/Symfony/Component/Messenger/Bridge/Doctrine/Transport/PostgreSqlConnection.php
@@ -70,9 +70,13 @@ public function get(): ?array
             $this->listening = true;
         }
 
-        $wrappedConnection = $this->driverConnection->getWrappedConnection();
-        if (!$wrappedConnection instanceof \PDO && $wrappedConnection instanceof DoctrinePdoConnection) {
-            $wrappedConnection = $wrappedConnection->getWrappedConnection();
+        if (method_exists($this->driverConnection, 'getNativeConnection')) {
+            $wrappedConnection = $this->driverConnection->getNativeConnection();
+        } else {
+            $wrappedConnection = $this->driverConnection->getWrappedConnection();
+            if (!$wrappedConnection instanceof \PDO && $wrappedConnection instanceof DoctrinePdoConnection) {
+                $wrappedConnection = $wrappedConnection->getWrappedConnection();
+            }
         }
 
         $notification = $wrappedConnection->pgsqlGetNotify(\PDO::FETCH_ASSOC, $this->configuration['get_notify_timeout']);
diff --git a/src/Symfony/Component/Messenger/Bridge/Redis/Transport/Connection.php b/src/Symfony/Component/Messenger/Bridge/Redis/Transport/Connection.php
index 9a2d12eea25a8..c810f2620b4c1 100644
--- a/src/Symfony/Component/Messenger/Bridge/Redis/Transport/Connection.php
+++ b/src/Symfony/Component/Messenger/Bridge/Redis/Transport/Connection.php
@@ -474,7 +474,7 @@ public function add(string $body, array $headers, int $delayInMs = 0): void
                     throw new TransportException(json_last_error_msg());
                 }
 
-                $score = (int) ($this->getCurrentTimeInMilliseconds() + $delayInMs);
+                $score = $this->getCurrentTimeInMilliseconds() + $delayInMs;
                 $added = $this->connection->zadd($this->queue, ['NX'], $score, $message);
             } else {
                 $message = json_encode([
diff --git a/src/Symfony/Component/Notifier/Bridge/AllMySms/AllMySmsTransport.php b/src/Symfony/Component/Notifier/Bridge/AllMySms/AllMySmsTransport.php
index fab94304bf015..28508bdde3506 100644
--- a/src/Symfony/Component/Notifier/Bridge/AllMySms/AllMySmsTransport.php
+++ b/src/Symfony/Component/Notifier/Bridge/AllMySms/AllMySmsTransport.php
@@ -64,7 +64,7 @@ protected function doSend(MessageInterface $message): SentMessage
         $endpoint = sprintf('https://%s/sms/send/', $this->getEndpoint());
         $response = $this->client->request('POST', $endpoint, [
             'auth_basic' => $this->login.':'.$this->apiKey,
-            'body' => [
+            'json' => [
                 'from' => $this->from,
                 'to' => $message->getPhone(),
                 'text' => $message->getSubject(),
diff --git a/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransport.php b/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransport.php
index 70313fb9f50f9..c69aeb6b4c0f7 100644
--- a/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransport.php
+++ b/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransport.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Notifier\Bridge\Nexmo;
 
+trigger_deprecation('symfony/nexmo-notifier', '5.4', 'The "symfony/nexmo-notifier" package is deprecated, use "symfony/vonage-notifier" instead.');
+
 use Symfony\Component\Notifier\Exception\TransportException;
 use Symfony\Component\Notifier\Exception\UnsupportedMessageTypeException;
 use Symfony\Component\Notifier\Message\MessageInterface;
@@ -23,6 +25,8 @@
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 5.4, use the Vonage bridge instead.
  */
 final class NexmoTransport extends AbstractTransport
 {
diff --git a/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransportFactory.php b/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransportFactory.php
index 6c7287b398658..f00b9232860bf 100644
--- a/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransportFactory.php
+++ b/src/Symfony/Component/Notifier/Bridge/Nexmo/NexmoTransportFactory.php
@@ -18,6 +18,8 @@
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 5.4, use the Vonage bridge instead.
  */
 final class NexmoTransportFactory extends AbstractTransportFactory
 {
diff --git a/src/Symfony/Component/Notifier/Bridge/Nexmo/README.md b/src/Symfony/Component/Notifier/Bridge/Nexmo/README.md
index 71b63069f5c0d..24006aabb35c2 100644
--- a/src/Symfony/Component/Notifier/Bridge/Nexmo/README.md
+++ b/src/Symfony/Component/Notifier/Bridge/Nexmo/README.md
@@ -1,19 +1,7 @@
 Nexmo Notifier
 ==============
 
-Provides [Nexmo](https://nexmo.com) integration for Symfony Notifier.
-
-DSN example
------------
-
-```
-NEXMO_DSN=nexmo://KEY:SECRET@default?from=FROM
-```
-
-where:
- - `KEY` is your Nexmo key
- - `SECRET` is your Nexmo secret
- - `FROM` is your sender
+The Nexmo bridge is deprecated, use the Vonage bridge instead.
 
 Resources
 ---------
diff --git a/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportFactoryTest.php b/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportFactoryTest.php
index a44545b069e5b..907b98e1ccf70 100644
--- a/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportFactoryTest.php
+++ b/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportFactoryTest.php
@@ -15,6 +15,9 @@
 use Symfony\Component\Notifier\Test\TransportFactoryTestCase;
 use Symfony\Component\Notifier\Transport\TransportFactoryInterface;
 
+/**
+ * @group legacy
+ */
 final class NexmoTransportFactoryTest extends TransportFactoryTestCase
 {
     /**
diff --git a/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportTest.php b/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportTest.php
index 8473b3a8888a1..d52014957b1c6 100644
--- a/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportTest.php
+++ b/src/Symfony/Component/Notifier/Bridge/Nexmo/Tests/NexmoTransportTest.php
@@ -19,6 +19,9 @@
 use Symfony\Component\Notifier\Transport\TransportInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
+/**
+ * @group legacy
+ */
 final class NexmoTransportTest extends TransportTestCase
 {
     /**
diff --git a/src/Symfony/Component/Notifier/Bridge/Nexmo/composer.json b/src/Symfony/Component/Notifier/Bridge/Nexmo/composer.json
index 8f2051c4c5ac4..8550289e8542d 100644
--- a/src/Symfony/Component/Notifier/Bridge/Nexmo/composer.json
+++ b/src/Symfony/Component/Notifier/Bridge/Nexmo/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=7.2.5",
+        "symfony/deprecation-contracts": "^2.1|^3",
         "symfony/http-client": "^4.3|^5.0|^6.0",
         "symfony/notifier": "^5.3|^6.0"
     },
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/.gitattributes b/src/Symfony/Component/Notifier/Bridge/Vonage/.gitattributes
new file mode 100644
index 0000000000000..84c7add058fb5
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/.gitattributes
@@ -0,0 +1,4 @@
+/Tests export-ignore
+/phpunit.xml.dist export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/.gitignore b/src/Symfony/Component/Notifier/Bridge/Vonage/.gitignore
new file mode 100644
index 0000000000000..c49a5d8df5c65
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/.gitignore
@@ -0,0 +1,3 @@
+vendor/
+composer.lock
+phpunit.xml
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/CHANGELOG.md b/src/Symfony/Component/Notifier/Bridge/Vonage/CHANGELOG.md
new file mode 100644
index 0000000000000..3a08c7ededfcd
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/CHANGELOG.md
@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+5.4
+---
+
+ * Add the bridge
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/LICENSE b/src/Symfony/Component/Notifier/Bridge/Vonage/LICENSE
new file mode 100644
index 0000000000000..efb17f98e7dd3
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2021 Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/README.md b/src/Symfony/Component/Notifier/Bridge/Vonage/README.md
new file mode 100644
index 0000000000000..5f43d5e0ec6c6
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/README.md
@@ -0,0 +1,24 @@
+Vonage Notifier
+===============
+
+Provides [Vonage](https://vonage.com) integration for Symfony Notifier.
+
+DSN example
+-----------
+
+```
+VONAGE_DSN=vonage://KEY:SECRET@default?from=FROM
+```
+
+where:
+ - `KEY` is your Vonage key
+ - `SECRET` is your Vonage secret
+ - `FROM` is your sender
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/Tests/VonageTransportFactoryTest.php b/src/Symfony/Component/Notifier/Bridge/Vonage/Tests/VonageTransportFactoryTest.php
new file mode 100644
index 0000000000000..b25b549828847
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/Tests/VonageTransportFactoryTest.php
@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Notifier\Bridge\Vonage\Tests;
+
+use Symfony\Component\Notifier\Bridge\Vonage\VonageTransportFactory;
+use Symfony\Component\Notifier\Test\TransportFactoryTestCase;
+use Symfony\Component\Notifier\Transport\TransportFactoryInterface;
+
+final class VonageTransportFactoryTest extends TransportFactoryTestCase
+{
+    /**
+     * @return VonageTransportFactory
+     */
+    public function createFactory(): TransportFactoryInterface
+    {
+        return new VonageTransportFactory();
+    }
+
+    public function createProvider(): iterable
+    {
+        yield [
+            'vonage://host.test?from=0611223344',
+            'vonage://apiKey:apiSecret@host.test?from=0611223344',
+        ];
+    }
+
+    public function supportsProvider(): iterable
+    {
+        yield [true, 'vonage://apiKey:apiSecret@default?from=0611223344'];
+        yield [false, 'somethingElse://apiKey:apiSecret@default?from=0611223344'];
+    }
+
+    public function missingRequiredOptionProvider(): iterable
+    {
+        yield 'missing option: from' => ['vonage://apiKey:apiSecret@default'];
+    }
+
+    public function unsupportedSchemeProvider(): iterable
+    {
+        yield ['somethingElse://apiKey:apiSecret@default?from=0611223344'];
+        yield ['somethingElse://apiKey:apiSecret@default']; // missing "from" option
+    }
+}
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/Tests/VonageTransportTest.php b/src/Symfony/Component/Notifier/Bridge/Vonage/Tests/VonageTransportTest.php
new file mode 100644
index 0000000000000..dc545a02a9d78
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/Tests/VonageTransportTest.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Notifier\Bridge\Vonage\Tests;
+
+use Symfony\Component\Notifier\Bridge\Vonage\VonageTransport;
+use Symfony\Component\Notifier\Message\ChatMessage;
+use Symfony\Component\Notifier\Message\MessageInterface;
+use Symfony\Component\Notifier\Message\SmsMessage;
+use Symfony\Component\Notifier\Test\TransportTestCase;
+use Symfony\Component\Notifier\Transport\TransportInterface;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+
+final class VonageTransportTest extends TransportTestCase
+{
+    /**
+     * @return VonageTransport
+     */
+    public function createTransport(HttpClientInterface $client = null): TransportInterface
+    {
+        return new VonageTransport('apiKey', 'apiSecret', 'sender', $client ?? $this->createMock(HttpClientInterface::class));
+    }
+
+    public function toStringProvider(): iterable
+    {
+        yield ['vonage://rest.nexmo.com?from=sender', $this->createTransport()];
+    }
+
+    public function supportedMessagesProvider(): iterable
+    {
+        yield [new SmsMessage('0611223344', 'Hello!')];
+    }
+
+    public function unsupportedMessagesProvider(): iterable
+    {
+        yield [new ChatMessage('Hello!')];
+        yield [$this->createMock(MessageInterface::class)];
+    }
+}
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/VonageTransport.php b/src/Symfony/Component/Notifier/Bridge/Vonage/VonageTransport.php
new file mode 100644
index 0000000000000..f47f41a70fefc
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/VonageTransport.php
@@ -0,0 +1,90 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Notifier\Bridge\Vonage;
+
+use Symfony\Component\Notifier\Exception\TransportException;
+use Symfony\Component\Notifier\Exception\UnsupportedMessageTypeException;
+use Symfony\Component\Notifier\Message\MessageInterface;
+use Symfony\Component\Notifier\Message\SentMessage;
+use Symfony\Component\Notifier\Message\SmsMessage;
+use Symfony\Component\Notifier\Transport\AbstractTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class VonageTransport extends AbstractTransport
+{
+    // see https://developer.vonage.com/messaging/sms/overview
+    protected const HOST = 'rest.nexmo.com';
+
+    private $apiKey;
+    private $apiSecret;
+    private $from;
+
+    public function __construct(string $apiKey, string $apiSecret, string $from, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null)
+    {
+        $this->apiKey = $apiKey;
+        $this->apiSecret = $apiSecret;
+        $this->from = $from;
+
+        parent::__construct($client, $dispatcher);
+    }
+
+    public function __toString(): string
+    {
+        return sprintf('vonage://%s?from=%s', $this->getEndpoint(), $this->from);
+    }
+
+    public function supports(MessageInterface $message): bool
+    {
+        return $message instanceof SmsMessage;
+    }
+
+    protected function doSend(MessageInterface $message): SentMessage
+    {
+        if (!$message instanceof SmsMessage) {
+            throw new UnsupportedMessageTypeException(__CLASS__, SmsMessage::class, $message);
+        }
+
+        $response = $this->client->request('POST', 'https://'.$this->getEndpoint().'/sms/json', [
+            'body' => [
+                'from' => $this->from,
+                'to' => $message->getPhone(),
+                'text' => $message->getSubject(),
+                'api_key' => $this->apiKey,
+                'api_secret' => $this->apiSecret,
+            ],
+        ]);
+
+        try {
+            $result = $response->toArray(false);
+        } catch (TransportExceptionInterface $e) {
+            throw new TransportException('Could not reach the remote Vonage server.', $response, 0, $e);
+        }
+
+        foreach ($result['messages'] as $msg) {
+            if ($msg['status'] ?? false) {
+                throw new TransportException('Unable to send the SMS: '.$msg['error-text'].sprintf(' (code %s).', $msg['status']), $response);
+            }
+        }
+
+        $success = $response->toArray(false);
+
+        $sentMessage = new SentMessage($message, (string) $this);
+        $sentMessage->setMessageId($success['messages'][0]['message-id']);
+
+        return $sentMessage;
+    }
+}
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/VonageTransportFactory.php b/src/Symfony/Component/Notifier/Bridge/Vonage/VonageTransportFactory.php
new file mode 100644
index 0000000000000..c0f23b2425481
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/VonageTransportFactory.php
@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Notifier\Bridge\Vonage;
+
+use Symfony\Component\Notifier\Exception\UnsupportedSchemeException;
+use Symfony\Component\Notifier\Transport\AbstractTransportFactory;
+use Symfony\Component\Notifier\Transport\Dsn;
+use Symfony\Component\Notifier\Transport\TransportInterface;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class VonageTransportFactory extends AbstractTransportFactory
+{
+    /**
+     * @return VonageTransport
+     */
+    public function create(Dsn $dsn): TransportInterface
+    {
+        $scheme = $dsn->getScheme();
+
+        if ('vonage' !== $scheme) {
+            throw new UnsupportedSchemeException($dsn, 'vonage', $this->getSupportedSchemes());
+        }
+
+        $apiKey = $this->getUser($dsn);
+        $apiSecret = $this->getPassword($dsn);
+        $from = $dsn->getRequiredOption('from');
+        $host = 'default' === $dsn->getHost() ? null : $dsn->getHost();
+        $port = $dsn->getPort();
+
+        return (new VonageTransport($apiKey, $apiSecret, $from, $this->client, $this->dispatcher))->setHost($host)->setPort($port);
+    }
+
+    protected function getSupportedSchemes(): array
+    {
+        return ['vonage'];
+    }
+}
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/composer.json b/src/Symfony/Component/Notifier/Bridge/Vonage/composer.json
new file mode 100644
index 0000000000000..c80b016feaaa5
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/composer.json
@@ -0,0 +1,30 @@
+{
+    "name": "symfony/vonage-notifier",
+    "type": "symfony-notifier-bridge",
+    "description": "Symfony Vonage Notifier Bridge",
+    "keywords": ["sms", "vonage", "notifier"],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Fabien Potencier",
+            "email": "fabien@symfony.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=7.2.5",
+        "symfony/http-client": "^4.3|^5.0|^6.0",
+        "symfony/notifier": "^5.3|^6.0"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Component\\Notifier\\Bridge\\Vonage\\": "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
+    },
+    "minimum-stability": "dev"
+}
diff --git a/src/Symfony/Component/Notifier/Bridge/Vonage/phpunit.xml.dist b/src/Symfony/Component/Notifier/Bridge/Vonage/phpunit.xml.dist
new file mode 100644
index 0000000000000..84bc254ccab03
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Vonage/phpunit.xml.dist
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/5.2/phpunit.xsd"
+         backupGlobals="false"
+         colors="true"
+         bootstrap="vendor/autoload.php"
+         failOnRisky="true"
+         failOnWarning="true"
+>
+    <php>
+        <ini name="error_reporting" value="-1" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Symfony Vonage Notifier Bridge Test Suite">
+            <directory>./Tests/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>./</directory>
+            <exclude>
+                <directory>./Resources</directory>
+                <directory>./Tests</directory>
+                <directory>./vendor</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/src/Symfony/Component/Notifier/Exception/UnsupportedSchemeException.php b/src/Symfony/Component/Notifier/Exception/UnsupportedSchemeException.php
index 0e7628f2f1552..ebe0cef610dfd 100644
--- a/src/Symfony/Component/Notifier/Exception/UnsupportedSchemeException.php
+++ b/src/Symfony/Component/Notifier/Exception/UnsupportedSchemeException.php
@@ -184,6 +184,10 @@ class UnsupportedSchemeException extends LogicException
             'class' => Bridge\Twilio\TwilioTransportFactory::class,
             'package' => 'symfony/twilio-notifier',
         ],
+        'vonage' => [
+            'class' => Bridge\Vonage\VonageTransportFactory::class,
+            'package' => 'symfony/vonage-notifier',
+        ],
         'yunpian' => [
             'class' => Bridge\Yunpian\YunpianTransportFactory::class,
             'package' => 'symfony/yunpian-notifier',
diff --git a/src/Symfony/Component/Notifier/Tests/Exception/UnsupportedSchemeExceptionTest.php b/src/Symfony/Component/Notifier/Tests/Exception/UnsupportedSchemeExceptionTest.php
index 05ef2ed964171..1cd8d4033eb4d 100644
--- a/src/Symfony/Component/Notifier/Tests/Exception/UnsupportedSchemeExceptionTest.php
+++ b/src/Symfony/Component/Notifier/Tests/Exception/UnsupportedSchemeExceptionTest.php
@@ -53,6 +53,7 @@
 use Symfony\Component\Notifier\Bridge\Telnyx\TelnyxTransportFactory;
 use Symfony\Component\Notifier\Bridge\TurboSms\TurboSmsTransportFactory;
 use Symfony\Component\Notifier\Bridge\Twilio\TwilioTransportFactory;
+use Symfony\Component\Notifier\Bridge\Vonage\VonageTransportFactory;
 use Symfony\Component\Notifier\Bridge\Yunpian\YunpianTransportFactory;
 use Symfony\Component\Notifier\Bridge\Zulip\ZulipTransportFactory;
 use Symfony\Component\Notifier\Exception\UnsupportedSchemeException;
@@ -107,6 +108,7 @@ public static function setUpBeforeClass(): void
             TelnyxTransportFactory::class => false,
             TurboSmsTransportFactory::class => false,
             TwilioTransportFactory::class => false,
+            VonageTransportFactory::class => false,
             YunpianTransportFactory::class => false,
             ZulipTransportFactory::class => false,
         ]);
diff --git a/src/Symfony/Component/Notifier/Transport.php b/src/Symfony/Component/Notifier/Transport.php
index a8ca4c91e6fa2..9944573630e68 100644
--- a/src/Symfony/Component/Notifier/Transport.php
+++ b/src/Symfony/Component/Notifier/Transport.php
@@ -45,6 +45,7 @@
 use Symfony\Component\Notifier\Bridge\Telnyx\TelnyxTransportFactory;
 use Symfony\Component\Notifier\Bridge\TurboSms\TurboSmsTransportFactory;
 use Symfony\Component\Notifier\Bridge\Twilio\TwilioTransportFactory;
+use Symfony\Component\Notifier\Bridge\Vonage\VonageTransportFactory;
 use Symfony\Component\Notifier\Bridge\Yunpian\YunpianTransportFactory;
 use Symfony\Component\Notifier\Bridge\Zulip\ZulipTransportFactory;
 use Symfony\Component\Notifier\Exception\UnsupportedSchemeException;
@@ -100,6 +101,7 @@ class Transport
         TelnyxTransportFactory::class,
         TurboSmsTransportFactory::class,
         TwilioTransportFactory::class,
+        VonageTransportFactory::class,
         YunpianTransportFactory::class,
         ZulipTransportFactory::class,
     ];
diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index f31e57358503c..4d811a69c1ea1 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -307,10 +307,10 @@ public function start(callable $callback = null, array $env = [])
         $descriptors = $this->getDescriptors();
 
         if ($this->env) {
-            $env += $this->env;
+            $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->env, $env, 'strcasecmp') : $this->env;
         }
 
-        $env += $this->getDefaultEnv();
+        $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->getDefaultEnv(), $env, 'strcasecmp') : $this->getDefaultEnv();
 
         if (\is_array($commandline = $this->commandline)) {
             $commandline = implode(' ', array_map([$this, 'escapeArgument'], $commandline));
@@ -1649,8 +1649,8 @@ private function replacePlaceholders(string $commandline, array $env)
     private function getDefaultEnv(): array
     {
         $env = getenv();
-        $env = array_intersect_key($env, $_SERVER) ?: $env;
+        $env = ('\\' === \DIRECTORY_SEPARATOR ? array_intersect_ukey($env, $_SERVER, 'strcasecmp') : array_intersect_key($env, $_SERVER)) ?: $env;
 
-        return $_ENV + $env;
+        return $_ENV + ('\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($env, $_ENV, 'strcasecmp') : $env);
     }
 }
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index 411cb8159be71..4a20fe1219b0b 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -1522,6 +1522,18 @@ public function testWaitStoppedDeadProcess()
         $this->assertFalse($process->isRunning());
     }
 
+    public function testEnvCaseInsensitiveOnWindows()
+    {
+        $p = $this->getProcessForCode('print_r([$_SERVER[\'PATH\'] ?? 1, $_SERVER[\'Path\'] ?? 2]);', null, ['PATH' => 'bar/baz']);
+        $p->run(null, ['Path' => 'foo/bar']);
+
+        if ('\\' === \DIRECTORY_SEPARATOR) {
+            $this->assertSame('Array ( [0] => 1 [1] => foo/bar )', preg_replace('/\s++/', ' ', trim($p->getOutput())));
+        } else {
+            $this->assertSame('Array ( [0] => bar/baz [1] => foo/bar )', preg_replace('/\s++/', ' ', trim($p->getOutput())));
+        }
+    }
+
     /**
      * @param string|array $commandline
      * @param mixed        $input
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index ee38448b842d2..223a8e9c4bff8 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -470,7 +470,7 @@ private function readProperty(array $zval, string $property, bool $ignoreInvalid
                         throw $e;
                     }
                 } elseif (PropertyReadInfo::TYPE_PROPERTY === $type) {
-                    if (!method_exists($object, '__get') && !\array_key_exists($name, (array) $object) && (\PHP_VERSION_ID < 70400 || !(new \ReflectionProperty($class, $name))->hasType())) {
+                    if (!method_exists($object, '__get') && !isset($object->$name) && !\array_key_exists($name, (array) $object) && (\PHP_VERSION_ID < 70400 || !(new \ReflectionProperty($class, $name))->hasType())) {
                         throw new UninitializedPropertyException(sprintf('The property "%s::$%s" is not initialized.', $class, $name));
                     }
 
diff --git a/src/Symfony/Component/Security/Http/Authenticator/AbstractPreAuthenticatedAuthenticator.php b/src/Symfony/Component/Security/Http/Authenticator/AbstractPreAuthenticatedAuthenticator.php
index 8e0e32d99f778..e28d669530d71 100644
--- a/src/Symfony/Component/Security/Http/Authenticator/AbstractPreAuthenticatedAuthenticator.php
+++ b/src/Symfony/Component/Security/Http/Authenticator/AbstractPreAuthenticatedAuthenticator.php
@@ -80,6 +80,17 @@ public function supports(Request $request): ?bool
             return false;
         }
 
+        // do not overwrite already stored tokens from the same user (i.e. from the session)
+        $token = $this->tokenStorage->getToken();
+
+        if ($token instanceof PreAuthenticatedToken && $this->firewallName === $token->getFirewallName() && $token->getUserIdentifier() === $username) {
+            if (null !== $this->logger) {
+                $this->logger->debug('Skipping pre-authenticated authenticator as the user already has an existing session.', ['authenticator' => static::class]);
+            }
+
+            return false;
+        }
+
         $request->attributes->set('_pre_authenticated_username', $username);
 
         return true;
diff --git a/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php b/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
index 46454e6aaf86a..89a5776decd29 100644
--- a/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
@@ -13,6 +13,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Authentication\Token\PreAuthenticatedToken;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage;
 use Symfony\Component\Security\Core\User\InMemoryUser;
 use Symfony\Component\Security\Core\User\InMemoryUserProvider;
@@ -37,6 +38,17 @@ public function testSupportNoUser()
         $this->assertFalse($authenticator->supports($this->createRequest([])));
     }
 
+    public function testSupportTokenStorageWithToken()
+    {
+        $tokenStorage = new TokenStorage();
+        $tokenStorage->setToken(new PreAuthenticatedToken(new InMemoryUser('username', null), 'main'));
+
+        $authenticator = new RemoteUserAuthenticator(new InMemoryUserProvider(), $tokenStorage, 'main');
+
+        $this->assertFalse($authenticator->supports($this->createRequest(['REMOTE_USER' => 'username'])));
+        $this->assertTrue($authenticator->supports($this->createRequest(['REMOTE_USER' => 'another_username'])));
+    }
+
     /**
      * @dataProvider provideAuthenticators
      */
diff --git a/src/Symfony/Component/Serializer/Normalizer/PropertyNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/PropertyNormalizer.php
index b81862b570940..38d81d9c9615e 100644
--- a/src/Symfony/Component/Serializer/Normalizer/PropertyNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/PropertyNormalizer.php
@@ -137,14 +137,14 @@ protected function getAttributeValue(object $object, string $attribute, string $
             return $reflectionProperty->getValue($object);
         }
 
-        if (!method_exists($object, '__get')) {
+        if (!method_exists($object, '__get') && !isset($object->$attribute)) {
             $propertyValues = (array) $object;
 
             if (($reflectionProperty->isPublic() && !\array_key_exists($reflectionProperty->name, $propertyValues))
                 || ($reflectionProperty->isProtected() && !\array_key_exists("\0*\0{$reflectionProperty->name}", $propertyValues))
                 || ($reflectionProperty->isPrivate() && !\array_key_exists("\0{$reflectionProperty->class}\0{$reflectionProperty->name}", $propertyValues))
             ) {
-                throw new UninitializedPropertyException(sprintf('The property "%s::$%s" is not initialized.', $reflectionProperty->class, $reflectionProperty->name));
+                throw new UninitializedPropertyException(sprintf('The property "%s::$%s" is not initialized.', \get_class($object), $reflectionProperty->name));
             }
         }
 
diff --git a/src/Symfony/Component/String/composer.json b/src/Symfony/Component/String/composer.json
index 6dc1c46fe31b5..2b88fd529e8b7 100644
--- a/src/Symfony/Component/String/composer.json
+++ b/src/Symfony/Component/String/composer.json
@@ -29,6 +29,9 @@
         "symfony/translation-contracts": "^1.1|^2",
         "symfony/var-exporter": "^4.4|^5.0|^6.0"
     },
+    "conflict": {
+        "symfony/translation-contracts": ">=3.0"
+    },
     "autoload": {
         "psr-4": { "Symfony\\Component\\String\\": "" },
         "files": [ "Resources/functions.php" ],
diff --git a/src/Symfony/Component/Templating/Storage/Storage.php b/src/Symfony/Component/Templating/Storage/Storage.php
index 97844ab6cab7e..c5e0d474a6c3d 100644
--- a/src/Symfony/Component/Templating/Storage/Storage.php
+++ b/src/Symfony/Component/Templating/Storage/Storage.php
@@ -35,7 +35,7 @@ public function __construct(string $template)
      */
     public function __toString()
     {
-        return (string) $this->template;
+        return $this->template;
     }
 
     /**
diff --git a/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php b/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php
index 160d7decb459f..f40e2119f644d 100644
--- a/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php
+++ b/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php
@@ -73,8 +73,15 @@ public function write(TranslatorBagInterface $translatorBag): void
             }
 
             foreach ($catalogue->all() as $domain => $messages) {
-                $ids = $this->getAssetsIds($domain);
-                $this->translateAssets(array_combine($ids, array_values($messages)), $locale);
+                $keysIdsMap = [];
+
+                foreach ($this->getAssetsIds($domain) as $id) {
+                    $keysIdsMap[$this->retrieveKeyFromId($id, $domain)] = $id;
+                }
+
+                $ids = array_intersect_key($keysIdsMap, $messages);
+
+                $this->translateAssets(array_combine(array_values($ids), array_values($messages)), $locale);
             }
         }
     }
@@ -120,11 +127,7 @@ public function read(array $domains, array $locales): TranslatorBag
             $catalogue = new MessageCatalogue($locale);
 
             foreach ($locoCatalogue->all($domain) as $key => $message) {
-                if (str_starts_with($key, $domain.'__')) {
-                    $key = substr($key, \strlen($domain) + 2);
-                }
-
-                $catalogue->set($key, $message, $domain);
+                $catalogue->set($this->retrieveKeyFromId($key, $domain), $message, $domain);
             }
 
             $translatorBag->addCatalogue($catalogue);
@@ -287,4 +290,13 @@ private function getLocales(): array
             return $carry;
         }, []);
     }
+
+    private function retrieveKeyFromId(string $id, string $domain): string
+    {
+        if (str_starts_with($id, $domain.'__')) {
+            return substr($id, \strlen($domain) + 2);
+        }
+
+        return $id;
+    }
 }
diff --git a/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php b/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php
index 09c779324310b..2a2183abf110f 100644
--- a/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php
+++ b/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php
@@ -148,7 +148,7 @@ public function testCompleteWriteProcess()
                 $this->assertSame(['filter' => 'messages'], $options['query']);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
 
-                return new MockResponse('[{"id":"messages__a"}]');
+                return new MockResponse('[{"id":"messages__foo.existing_key"},{"id":"messages__a"}]');
             },
             'translateAsset1' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('POST', $method);
@@ -164,7 +164,7 @@ public function testCompleteWriteProcess()
                 $this->assertSame(['filter' => 'validators'], $options['query']);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
 
-                return new MockResponse('[{"id":"validators__post.num_comments"}]');
+                return new MockResponse('[{"id":"validators__foo.existing_key"},{"id":"validators__post.num_comments"}]');
             },
             'translateAsset2' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('POST', $method);
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 4cc4367de898d..dc0626093f278 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -457,7 +457,7 @@ protected function computeFallbackLocales(string $locale)
      */
     protected function assertValidLocale(string $locale)
     {
-        if (!preg_match('/^[a-z0-9@_\\.\\-]*$/i', (string) $locale)) {
+        if (!preg_match('/^[a-z0-9@_\\.\\-]*$/i', $locale)) {
             throw new InvalidArgumentException(sprintf('Invalid "%s" locale.', $locale));
         }
     }
diff --git a/src/Symfony/Component/Validator/Constraints/UrlValidator.php b/src/Symfony/Component/Validator/Constraints/UrlValidator.php
index 82e07feb6b792..a72eac6aae2b2 100644
--- a/src/Symfony/Component/Validator/Constraints/UrlValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/UrlValidator.php
@@ -25,7 +25,13 @@ class UrlValidator extends ConstraintValidator
             (%s)://                                 # protocol
             (((?:[\_\.\pL\pN-]|%%[0-9A-Fa-f]{2})+:)?((?:[\_\.\pL\pN-]|%%[0-9A-Fa-f]{2})+)@)?  # basic auth
             (
-                ([\pL\pN\pS\-\_]+\.)*(([\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
+                (?:
+                    (?:xn--[a-z0-9-]++\.)*+xn--[a-z0-9-]++            # a domain name using punycode
+                        |
+                    (?:[\pL\pN\pS\pM\-\_]++\.)+[\pL\pN\pM]++          # a multi-level domain name
+                        |
+                    [a-z0-9\-\_]++                                    # a single-level domain name
+                )\.?
                     |                                                 # or
                 \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}                    # an IP address
                     |                                                 # or
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
index 74f445085e47d..9f6667f836f9d 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
@@ -67,7 +67,7 @@ protected function addNamespaceAlias(string $alias, string $namespace)
     protected function newConstraint(string $name, $options = null)
     {
         if (str_contains($name, '\\') && class_exists($name)) {
-            $className = (string) $name;
+            $className = $name;
         } elseif (str_contains($name, ':')) {
             [$prefix, $className] = explode(':', $name, 2);
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
index d88fbff6cd899..8227cd73f1b21 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
@@ -123,6 +123,10 @@ public function getValidUrls()
             ['http://very.long.domain.name.com/'],
             ['http://localhost/'],
             ['http://myhost123/'],
+            ['http://internal-api'],
+            ['http://internal-api.'],
+            ['http://internal-api/'],
+            ['http://internal-api/path'],
             ['http://127.0.0.1/'],
             ['http://127.0.0.1:80/'],
             ['http://[::1]/'],
@@ -169,6 +173,7 @@ public function getValidUrls()
             ['http://symfony.com/#fragment'],
             ['http://symfony.com/#one_more%20test'],
             ['http://example.com/exploit.html?hello[0]=test'],
+            ['http://বিডিআইএ.বাংলা'],
         ];
     }
 
@@ -254,7 +259,14 @@ public function getInvalidUrls()
             ['http://127.0.0.1:aa/'],
             ['ftp://[::1]/'],
             ['http://[::1'],
+            ['http://☎'],
+            ['http://☎.'],
+            ['http://☎/'],
+            ['http://☎/path'],
+            ['http://hello.☎'],
+            ['http://hello.☎.'],
             ['http://hello.☎/'],
+            ['http://hello.☎/path'],
             ['http://:password@symfony.com'],
             ['http://:password@@symfony.com'],
             ['http://username:passwordsymfony.com'],
@@ -271,6 +283,9 @@ public function getInvalidUrls()
             ['http://.m.example.com'],
             ['http://wwww.example..com'],
             ['http://.www.example.com'],
+            ['http://example.co-'],
+            ['http://example.co-/path'],
+            ['http:///path'],
         ];
     }
 
diff --git a/src/Symfony/Component/VarDumper/Cloner/Data.php b/src/Symfony/Component/VarDumper/Cloner/Data.php
index 8d3c518964e46..ea8f0f33abbe1 100644
--- a/src/Symfony/Component/VarDumper/Cloner/Data.php
+++ b/src/Symfony/Component/VarDumper/Cloner/Data.php
@@ -209,7 +209,7 @@ public function __toString()
     public function withMaxDepth(int $maxDepth)
     {
         $data = clone $this;
-        $data->maxDepth = (int) $maxDepth;
+        $data->maxDepth = $maxDepth;
 
         return $data;
     }
@@ -222,7 +222,7 @@ public function withMaxDepth(int $maxDepth)
     public function withMaxItemsPerDepth(int $maxItemsPerDepth)
     {
         $data = clone $this;
-        $data->maxItemsPerDepth = (int) $maxItemsPerDepth;
+        $data->maxItemsPerDepth = $maxItemsPerDepth;
 
         return $data;
     }
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 097b1a332051b..1e76c4fa1a634 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -669,7 +669,7 @@ private static function evaluateScalar(string $scalar, int $flags, array &$refer
             // no break
             case \in_array($scalar[0], ['+', '-', '.'], true) || is_numeric($scalar[0]):
                 if (Parser::preg_match('{^[+-]?[0-9][0-9_]*$}', $scalar)) {
-                    $scalar = str_replace('_', '', (string) $scalar);
+                    $scalar = str_replace('_', '', $scalar);
                 }
 
                 switch (true) {

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