diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index ce8bcced1c793..8835d56fb86dd 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -37,6 +37,7 @@
         'header_comment' => ['header' => $fileHeaderComment],
         'modernize_strpos' => true,
         'get_class_to_class_keyword' => true,
+        'nullable_type_declaration' => true,
     ])
     ->setRiskyAllowed(true)
     ->setFinder(
diff --git a/src/Symfony/Component/DependencyInjection/Attribute/Autoconfigure.php b/src/Symfony/Component/DependencyInjection/Attribute/Autoconfigure.php
index dec8726ac2087..4560ed696183e 100644
--- a/src/Symfony/Component/DependencyInjection/Attribute/Autoconfigure.php
+++ b/src/Symfony/Component/DependencyInjection/Attribute/Autoconfigure.php
@@ -29,7 +29,7 @@ public function __construct(
         public ?bool $autowire = null,
         public ?array $properties = null,
         public array|string|null $configurator = null,
-        public string|null $constructor = null,
+        public ?string $constructor = null,
     ) {
     }
 }
diff --git a/src/Symfony/Component/Dotenv/Command/DotenvDumpCommand.php b/src/Symfony/Component/Dotenv/Command/DotenvDumpCommand.php
index 2ca01c531247e..051f4b05a04b3 100644
--- a/src/Symfony/Component/Dotenv/Command/DotenvDumpCommand.php
+++ b/src/Symfony/Component/Dotenv/Command/DotenvDumpCommand.php
@@ -30,7 +30,7 @@
 final class DotenvDumpCommand extends Command
 {
     private string $projectDir;
-    private string|null $defaultEnv;
+    private ?string $defaultEnv;
 
     public function __construct(string $projectDir, string $defaultEnv = null)
     {
diff --git a/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php b/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php
index 828218a452c8c..a7a40779bbac1 100644
--- a/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php
+++ b/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php
@@ -32,7 +32,7 @@ class OrderedHashMapIterator implements \Iterator
     private int $cursorId;
     /** @var array<int, int> */
     private array $managedCursors;
-    private string|null $key = null;
+    private ?string $key = null;
     /** @var TValue|null */
     private mixed $current = null;
 
diff --git a/src/Symfony/Component/Notifier/Bridge/Novu/NovuOptions.php b/src/Symfony/Component/Notifier/Bridge/Novu/NovuOptions.php
index 16bd950096062..728c03e5d8bc8 100644
--- a/src/Symfony/Component/Notifier/Bridge/Novu/NovuOptions.php
+++ b/src/Symfony/Component/Notifier/Bridge/Novu/NovuOptions.php
@@ -19,13 +19,13 @@
 class NovuOptions implements MessageOptionsInterface
 {
     public function __construct(
-        private readonly string|null $subscriberId = null,
-        private readonly string|null $firstName = null,
-        private readonly string|null $lastName = null,
-        private readonly string|null $email = null,
-        private readonly string|null $phone = null,
-        private readonly string|null $avatar = null,
-        private readonly string|null $locale = null,
+        private readonly ?string $subscriberId = null,
+        private readonly ?string $firstName = null,
+        private readonly ?string $lastName = null,
+        private readonly ?string $email = null,
+        private readonly ?string $phone = null,
+        private readonly ?string $avatar = null,
+        private readonly ?string $locale = null,
         private readonly array $options = [],
     ) {
     }
diff --git a/src/Symfony/Component/Notifier/Bridge/Novu/NovuSubscriberRecipient.php b/src/Symfony/Component/Notifier/Bridge/Novu/NovuSubscriberRecipient.php
index 027c39876e017..d1358145e2dda 100644
--- a/src/Symfony/Component/Notifier/Bridge/Novu/NovuSubscriberRecipient.php
+++ b/src/Symfony/Component/Notifier/Bridge/Novu/NovuSubscriberRecipient.php
@@ -20,12 +20,12 @@ class NovuSubscriberRecipient implements RecipientInterface
 {
     public function __construct(
         private readonly string $subscriberId,
-        private readonly string|null $firstName = null,
-        private readonly string|null $lastName = null,
-        private readonly string|null $email = null,
-        private readonly string|null $phone = null,
-        private readonly string|null $avatar = null,
-        private readonly string|null $locale = null,
+        private readonly ?string $firstName = null,
+        private readonly ?string $lastName = null,
+        private readonly ?string $email = null,
+        private readonly ?string $phone = null,
+        private readonly ?string $avatar = null,
+        private readonly ?string $locale = null,
     ) {
     }
 

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