diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
index b4829942f2ded..7f4f5890fa899 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
@@ -49,6 +49,7 @@
             <tag name="container.hot_path" />
         </service>
         <service id="Symfony\Component\EventDispatcher\EventDispatcherInterface" alias="event_dispatcher" />
+        <service id="Symfony\Contracts\EventDispatcher\EventDispatcherInterface" alias="event_dispatcher" />
 
         <service id="http_kernel" class="Symfony\Component\HttpKernel\HttpKernel" public="true">
             <argument type="service" id="event_dispatcher" />
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php
index d9a7b59d46ba6..4743460e6ee5b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php
@@ -13,7 +13,7 @@
 
 use Doctrine\Common\Annotations\Reader;
 use Psr\Cache\CacheItemPoolInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class AutowiredServices
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 57a7e256234cf..853711aca32cd 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -20,7 +20,7 @@
         "ext-xml": "*",
         "symfony/cache": "~4.3",
         "symfony/config": "~4.2",
-        "symfony/contracts": "^1.0.2",
+        "symfony/contracts": "^1.1",
         "symfony/dependency-injection": "^4.3",
         "symfony/http-foundation": "^4.3",
         "symfony/http-kernel": "^4.3",
diff --git a/src/Symfony/Bundle/SecurityBundle/EventListener/FirewallListener.php b/src/Symfony/Bundle/SecurityBundle/EventListener/FirewallListener.php
index 1a3712c7507c4..3dca451d9ab17 100644
--- a/src/Symfony/Bundle/SecurityBundle/EventListener/FirewallListener.php
+++ b/src/Symfony/Bundle/SecurityBundle/EventListener/FirewallListener.php
@@ -30,6 +30,8 @@ class FirewallListener extends Firewall
 
     public function __construct(FirewallMapInterface $map, EventDispatcherInterface $dispatcher, LogoutUrlGenerator $logoutUrlGenerator)
     {
+        // the type-hint will be updated to the "EventDispatcherInterface" from symfony/contracts in 5.0
+
         $this->map = $map;
         $this->logoutUrlGenerator = $logoutUrlGenerator;
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php
index 209248cc85bd0..7e583facf7b09 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php
@@ -17,7 +17,6 @@
 use Symfony\Bundle\SecurityBundle\Security\FirewallConfig;
 use Symfony\Bundle\SecurityBundle\Security\FirewallMap;
 use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\RequestEvent;
@@ -34,6 +33,7 @@
 use Symfony\Component\Security\Core\Role\SwitchUserRole;
 use Symfony\Component\Security\Http\FirewallMapInterface;
 use Symfony\Component\Security\Http\Logout\LogoutUrlGenerator;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class SecurityDataCollectorTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Application.php b/src/Symfony/Component/Console/Application.php
index fcb334a8a1756..667be07b5afd8 100644
--- a/src/Symfony/Component/Console/Application.php
+++ b/src/Symfony/Component/Console/Application.php
@@ -91,6 +91,9 @@ public function __construct(string $name = 'UNKNOWN', string $version = 'UNKNOWN
         $this->defaultCommand = 'list';
     }
 
+    /**
+     * @final since Symfony 4.3, the type-hint will be updated to the interface from symfony/contracts in 5.0
+     */
     public function setDispatcher(EventDispatcherInterface $dispatcher)
     {
         $this->dispatcher = LegacyEventDispatcherProxy::decorate($dispatcher);
diff --git a/src/Symfony/Component/Console/composer.json b/src/Symfony/Component/Console/composer.json
index 8eff5b7458e4c..b8033b2272fec 100644
--- a/src/Symfony/Component/Console/composer.json
+++ b/src/Symfony/Component/Console/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/contracts": "^1.0",
+        "symfony/contracts": "^1.1",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/polyfill-php73": "^1.8"
     },
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
index 6a9c9237682fc..5aa6680e7e01d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
@@ -226,16 +226,7 @@ private function autowireMethod(\ReflectionFunctionAbstract $reflectionMethod, a
                     if ($parameter->isDefaultValueAvailable()) {
                         $value = $parameter->getDefaultValue();
                     } elseif (!$parameter->allowsNull()) {
-                        if (\function_exists('xdebug_disable')) {
-                            xdebug_disable();
-                        }
-                        try {
-                            throw new AutowiringFailedException($this->currentId, $failureMessage);
-                        } finally {
-                            if (\function_exists('xdebug_enable')) {
-                                xdebug_enable();
-                            }
-                        }
+                        throw new AutowiringFailedException($this->currentId, $failureMessage);
                     }
                 }
 
diff --git a/src/Symfony/Component/DependencyInjection/Exception/AutowiringFailedException.php b/src/Symfony/Component/DependencyInjection/Exception/AutowiringFailedException.php
index be2bd26dcad1d..99a5b17ccd044 100644
--- a/src/Symfony/Component/DependencyInjection/Exception/AutowiringFailedException.php
+++ b/src/Symfony/Component/DependencyInjection/Exception/AutowiringFailedException.php
@@ -23,6 +23,10 @@ public function __construct(string $serviceId, $message = '', int $code = 0, \Ex
     {
         $this->serviceId = $serviceId;
 
+        if ($message instanceof \Closure && \function_exists('xdebug_is_enabled') && xdebug_is_enabled()) {
+            $message = $message();
+        }
+
         if (!$message instanceof \Closure) {
             parent::__construct($message, $code, $previous);
 
diff --git a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
index 0a0dde4230d0d..f40dfa4bef982 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\EventDispatcher\Debug;
 
+use Psr\EventDispatcher\StoppableEventInterface;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -133,7 +134,7 @@ public function dispatch($event/*, string $eventName = null*/)
 
         $eventName = 1 < \func_num_args() ? \func_get_arg(1) : null;
 
-        if ($event instanceof Event) {
+        if (\is_object($event)) {
             $eventName = $eventName ?? \get_class($event);
         } else {
             @trigger_error(sprintf('Calling the "%s::dispatch()" method with the event name as first argument is deprecated since Symfony 4.3, pass it second and provide the event object first instead.', EventDispatcherInterface::class), E_USER_DEPRECATED);
@@ -146,13 +147,13 @@ public function dispatch($event/*, string $eventName = null*/)
             }
         }
 
-        if (null !== $this->logger && $event->isPropagationStopped()) {
+        if (null !== $this->logger && ($event instanceof Event || $event instanceof StoppableEventInterface) && $event->isPropagationStopped()) {
             $this->logger->debug(sprintf('The "%s" event is already stopped. No listeners have been called.', $eventName));
         }
 
         $this->preProcess($eventName);
         try {
-            $this->preDispatch($eventName, $event);
+            $this->beforeDispatch($eventName, $event);
             try {
                 $e = $this->stopwatch->start($eventName, 'section');
                 try {
@@ -163,7 +164,7 @@ public function dispatch($event/*, string $eventName = null*/)
                     }
                 }
             } finally {
-                $this->postDispatch($eventName, $event);
+                $this->afterDispatch($eventName, $event);
             }
         } finally {
             $this->postProcess($eventName);
@@ -262,18 +263,32 @@ public function __call($method, $arguments)
     /**
      * Called before dispatching the event.
      *
-     * @param string $eventName The event name
-     * @param Event  $event     The event
+     * @param object $event
      */
-    protected function preDispatch($eventName, Event $event)
+    protected function beforeDispatch(string $eventName, $event)
     {
+        $this->preDispatch($eventName, $event);
     }
 
     /**
      * Called after dispatching the event.
      *
-     * @param string $eventName The event name
-     * @param Event  $event     The event
+     * @param object $event
+     */
+    protected function afterDispatch(string $eventName, $event)
+    {
+        $this->postDispatch($eventName, $event);
+    }
+
+    /**
+     * @deprecated since Symfony 4.3, will be removed in 5.0, use beforeDispatch instead
+     */
+    protected function preDispatch($eventName, Event $event)
+    {
+    }
+
+    /**
+     * @deprecated since Symfony 4.3, will be removed in 5.0, use afterDispatch instead
      */
     protected function postDispatch($eventName, Event $event)
     {
diff --git a/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php b/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
index 8aa3f80a76713..5342fc88a1a54 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\EventDispatcher\Debug;
 
+use Psr\EventDispatcher\StoppableEventInterface;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Stopwatch\Stopwatch;
@@ -18,6 +19,8 @@
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @final since Symfony 4.3: the "Event" type-hint on __invoke() will be replaced by "object" in 5.0
  */
 class WrappedListener
 {
@@ -120,7 +123,7 @@ public function __invoke(Event $event, $eventName, EventDispatcherInterface $dis
             $e->stop();
         }
 
-        if ($event->isPropagationStopped()) {
+        if (($event instanceof Event || $event instanceof StoppableEventInterface) && $event->isPropagationStopped()) {
             $this->stoppedPropagation = true;
         }
     }
diff --git a/src/Symfony/Component/EventDispatcher/EventDispatcher.php b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
index 80b3105e6a66c..d6a78d1871cb7 100644
--- a/src/Symfony/Component/EventDispatcher/EventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\EventDispatcher;
 
+use Psr\EventDispatcher\StoppableEventInterface;
+
 /**
  * The EventDispatcherInterface is the central point of Symfony's event listener system.
  *
@@ -48,7 +50,7 @@ public function dispatch($event/*, string $eventName = null*/)
     {
         $eventName = 1 < \func_num_args() ? \func_get_arg(1) : null;
 
-        if ($event instanceof Event) {
+        if (\is_object($event)) {
             $eventName = $eventName ?? \get_class($event);
         } else {
             @trigger_error(sprintf('Calling the "%s::dispatch()" method with the event name as first argument is deprecated since Symfony 4.3, pass it second and provide the event object first instead.', EventDispatcherInterface::class), E_USER_DEPRECATED);
@@ -223,12 +225,22 @@ public function removeSubscriber(EventSubscriberInterface $subscriber)
      *
      * @param callable[] $listeners The event listeners
      * @param string     $eventName The name of the event to dispatch
-     * @param Event      $event     The event object to pass to the event handlers/listeners
+     * @param object     $event     The event object to pass to the event handlers/listeners
+     */
+    protected function callListeners(iterable $listeners, string $eventName, $event)
+    {
+        $this->doDispatch($listeners, $eventName, $event);
+    }
+
+    /**
+     * @deprecated since Symfony 4.3, use callListeners() instead
      */
     protected function doDispatch($listeners, $eventName, Event $event)
     {
+        $stoppable = $event instanceof Event || $event instanceof StoppableEventInterface;
+
         foreach ($listeners as $listener) {
-            if ($event->isPropagationStopped()) {
+            if ($stoppable && $event->isPropagationStopped()) {
                 break;
             }
             $listener($event, $eventName, $this);
diff --git a/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php b/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
index 672f5044d720a..ceaa62aeb0472 100644
--- a/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
+++ b/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\EventDispatcher;
 
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface as ContractsEventDispatcherInterface;
+
 /**
  * The EventDispatcherInterface is the central point of Symfony's event listener system.
  * Listeners are registered on the manager and events are dispatched through the
@@ -18,19 +20,8 @@
  *
  * @author Bernhard Schussek <bschussek@gmail.com>
  */
-interface EventDispatcherInterface
+interface EventDispatcherInterface extends ContractsEventDispatcherInterface
 {
-    /**
-     * Dispatches an event to all registered listeners.
-     *
-     * @param Event       $event     The event to pass to the event handlers/listeners
-     * @param string|null $eventName The name of the event to dispatch. If not supplied,
-     *                               the class of $event should be used instead.
-     *
-     * @return Event
-     */
-    public function dispatch($event/*, string $eventName = null*/);
-
     /**
      * Adds an event listener that listens on the specified events.
      *
diff --git a/src/Symfony/Component/EventDispatcher/LegacyEventDispatcherProxy.php b/src/Symfony/Component/EventDispatcher/LegacyEventDispatcherProxy.php
index 8539376206bc7..54de7a44386d1 100644
--- a/src/Symfony/Component/EventDispatcher/LegacyEventDispatcherProxy.php
+++ b/src/Symfony/Component/EventDispatcher/LegacyEventDispatcherProxy.php
@@ -11,6 +11,9 @@
 
 namespace Symfony\Component\EventDispatcher;
 
+use Psr\EventDispatcher\StoppableEventInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+
 /**
  * An helper class to provide BC/FC with the legacy signature of EventDispatcherInterface::dispatch().
  *
@@ -51,7 +54,7 @@ public function dispatch($event/*, string $eventName = null*/)
     {
         $eventName = 1 < \func_num_args() ? \func_get_arg(1) : null;
 
-        if ($event instanceof Event) {
+        if (\is_object($event)) {
             $eventName = $eventName ?? \get_class($event);
         } else {
             @trigger_error(sprintf('Calling the "%s::dispatch()" method with the event name as first argument is deprecated since Symfony 4.3, pass it second and provide the event object first instead.', EventDispatcherInterface::class), E_USER_DEPRECATED);
@@ -65,9 +68,10 @@ public function dispatch($event/*, string $eventName = null*/)
         }
 
         $listeners = $this->getListeners($eventName);
+        $stoppable = $event instanceof Event || $event instanceof StoppableEventInterface;
 
         foreach ($listeners as $listener) {
-            if ($event->isPropagationStopped()) {
+            if ($stoppable && $event->isPropagationStopped()) {
                 break;
             }
             $listener($event, $eventName, $this);
diff --git a/src/Symfony/Component/EventDispatcher/composer.json b/src/Symfony/Component/EventDispatcher/composer.json
index 6cdc762bc301b..163149f412beb 100644
--- a/src/Symfony/Component/EventDispatcher/composer.json
+++ b/src/Symfony/Component/EventDispatcher/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/contracts": "^1.0"
+        "symfony/contracts": "^1.1"
     },
     "require-dev": {
         "symfony/dependency-injection": "~3.4|~4.0",
@@ -29,6 +29,10 @@
     "conflict": {
         "symfony/dependency-injection": "<3.4"
     },
+    "provide": {
+        "psr/event-dispatcher-implementation": "1.0",
+        "symfony/event-dispatcher-implementation": "1.1"
+    },
     "suggest": {
         "symfony/dependency-injection": "",
         "symfony/http-kernel": ""
diff --git a/src/Symfony/Component/Form/Test/TypeTestCase.php b/src/Symfony/Component/Form/Test/TypeTestCase.php
index 19fb5c32a0739..76074d133fa60 100644
--- a/src/Symfony/Component/Form/Test/TypeTestCase.php
+++ b/src/Symfony/Component/Form/Test/TypeTestCase.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\Form\Test;
 
-use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\Form\Test\Traits\ValidatorExtensionTrait;
 
@@ -25,7 +25,7 @@ abstract class TypeTestCase extends FormIntegrationTestCase
     protected $builder;
 
     /**
-     * @var EventDispatcher
+     * @var EventDispatcherInterface
      */
     protected $dispatcher;
 
@@ -33,7 +33,7 @@ private function doSetUp()
     {
         parent::setUp();
 
-        $this->dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        $this->dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
         $this->builder = new FormBuilder('', null, $this->dispatcher, $this->factory);
     }
 
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
index c0de2509405ed..8e84c6acf6973 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher;
 use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\Service\ResetInterface;
 
 /**
diff --git a/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php b/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
index ddf4fa7cecf05..6bd45caa7a02a 100644
--- a/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
+++ b/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
@@ -27,7 +27,7 @@ class TraceableEventDispatcher extends BaseTraceableEventDispatcher
     /**
      * {@inheritdoc}
      */
-    protected function preDispatch($eventName, Event $event)
+    protected function beforeDispatch(string $eventName, $event)
     {
         switch ($eventName) {
             case KernelEvents::REQUEST:
@@ -58,7 +58,7 @@ protected function preDispatch($eventName, Event $event)
     /**
      * {@inheritdoc}
      */
-    protected function postDispatch($eventName, Event $event)
+    protected function afterDispatch(string $eventName, $event)
     {
         switch ($eventName) {
             case KernelEvents::CONTROLLER_ARGUMENTS:
diff --git a/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php b/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
index 9d6d31ea96e64..8e31ecc944e37 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
@@ -54,6 +54,10 @@ public function logKernelException(GetResponseForExceptionEvent $event)
         $this->logException($event->getException(), sprintf('Uncaught PHP Exception %s: "%s" at %s line %s', $e->getClass(), $e->getMessage(), $e->getFile(), $e->getLine()));
     }
 
+    /**
+     * @param string                   $eventName
+     * @param EventDispatcherInterface $eventDispatcher
+     */
     public function onKernelException(GetResponseForExceptionEvent $event)
     {
         if (null === $this->controller) {
diff --git a/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
index bc397438d2488..7d6243552a7bd 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\HttpKernel\Fragment;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -20,6 +19,7 @@
 use Symfony\Component\HttpKernel\HttpCache\SubRequestHandler;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * Implements the inline rendering strategy where the Request is rendered by the current HTTP kernel.
diff --git a/src/Symfony/Component/HttpKernel/HttpKernel.php b/src/Symfony/Component/HttpKernel/HttpKernel.php
index 3de9b0202b530..64e931f2bd40d 100644
--- a/src/Symfony/Component/HttpKernel/HttpKernel.php
+++ b/src/Symfony/Component/HttpKernel/HttpKernel.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\HttpKernel;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
 use Symfony\Component\HttpFoundation\Request;
@@ -32,6 +31,7 @@
 use Symfony\Component\HttpKernel\Exception\ControllerDoesNotReturnResponseException;
 use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * HttpKernel notifies events to convert a Request object to a Response one.
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
index c8b79e8ff3c9e..d6f0ff7771e2b 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
@@ -21,6 +21,7 @@
 use Symfony\Component\HttpKernel\Fragment\InlineFragmentRenderer;
 use Symfony\Component\HttpKernel\HttpKernel;
 use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class InlineFragmentRendererTest extends TestCase
 {
@@ -73,7 +74,7 @@ public function testRenderWithTrustedHeaderDisabled()
      */
     public function testRenderExceptionNoIgnoreErrors()
     {
-        $dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        $dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
         $dispatcher->expects($this->never())->method('dispatch');
 
         $strategy = new InlineFragmentRenderer($this->getKernel($this->throwException(new \RuntimeException('foo'))), $dispatcher);
@@ -87,7 +88,7 @@ public function testRenderExceptionIgnoreErrors()
         $kernel = $this->getKernel($this->throwException($exception));
         $request = Request::create('/');
         $expectedEvent = new ExceptionEvent($kernel, $request, $kernel::SUB_REQUEST, $exception);
-        $dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        $dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
         $dispatcher->expects($this->once())->method('dispatch')->with($expectedEvent, KernelEvents::EXCEPTION);
 
         $strategy = new InlineFragmentRenderer($kernel, $dispatcher);
diff --git a/src/Symfony/Component/HttpKernel/composer.json b/src/Symfony/Component/HttpKernel/composer.json
index b250dd30f702f..ca818d16707ab 100644
--- a/src/Symfony/Component/HttpKernel/composer.json
+++ b/src/Symfony/Component/HttpKernel/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/contracts": "^1.0.2",
+        "symfony/contracts": "^1.1",
         "symfony/event-dispatcher": "^4.3",
         "symfony/http-foundation": "^4.1.1",
         "symfony/debug": "~3.4|~4.0",
diff --git a/src/Symfony/Component/Messenger/Command/ConsumeMessagesCommand.php b/src/Symfony/Component/Messenger/Command/ConsumeMessagesCommand.php
index af916cb785c1c..e49b28705c876 100644
--- a/src/Symfony/Component/Messenger/Command/ConsumeMessagesCommand.php
+++ b/src/Symfony/Component/Messenger/Command/ConsumeMessagesCommand.php
@@ -20,12 +20,12 @@
 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\Component\Messenger\RoutableMessageBus;
 use Symfony\Component\Messenger\Transport\Receiver\StopWhenMemoryUsageIsExceededReceiver;
 use Symfony\Component\Messenger\Transport\Receiver\StopWhenMessageCountIsExceededReceiver;
 use Symfony\Component\Messenger\Transport\Receiver\StopWhenTimeLimitIsReachedReceiver;
 use Symfony\Component\Messenger\Worker;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Samuel Roze <samuel.roze@gmail.com>
diff --git a/src/Symfony/Component/Messenger/Event/AbstractWorkerMessageEvent.php b/src/Symfony/Component/Messenger/Event/AbstractWorkerMessageEvent.php
index 0f2b644139394..237f244758ffd 100644
--- a/src/Symfony/Component/Messenger/Event/AbstractWorkerMessageEvent.php
+++ b/src/Symfony/Component/Messenger/Event/AbstractWorkerMessageEvent.php
@@ -11,13 +11,12 @@
 
 namespace Symfony\Component\Messenger\Event;
 
-use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\Messenger\Envelope;
 
 /**
  * @experimental in 4.3
  */
-abstract class AbstractWorkerMessageEvent extends Event
+abstract class AbstractWorkerMessageEvent
 {
     private $envelope;
     private $receiverName;
diff --git a/src/Symfony/Component/Messenger/Event/SendMessageToTransportsEvent.php b/src/Symfony/Component/Messenger/Event/SendMessageToTransportsEvent.php
index a54622e83cf99..2e11a9209afec 100644
--- a/src/Symfony/Component/Messenger/Event/SendMessageToTransportsEvent.php
+++ b/src/Symfony/Component/Messenger/Event/SendMessageToTransportsEvent.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\Messenger\Event;
 
-use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\Messenger\Envelope;
 
 /**
@@ -23,7 +22,7 @@
  *
  * @author Ryan Weaver <ryan@symfonycasts.com>
  */
-class SendMessageToTransportsEvent extends Event
+class SendMessageToTransportsEvent
 {
     private $envelope;
 
diff --git a/src/Symfony/Component/Messenger/Middleware/SendMessageMiddleware.php b/src/Symfony/Component/Messenger/Middleware/SendMessageMiddleware.php
index e389da910cbf9..ba267ae7d2ca5 100644
--- a/src/Symfony/Component/Messenger/Middleware/SendMessageMiddleware.php
+++ b/src/Symfony/Component/Messenger/Middleware/SendMessageMiddleware.php
@@ -13,13 +13,13 @@
 
 use Psr\Log\LoggerAwareTrait;
 use Psr\Log\NullLogger;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Messenger\Envelope;
 use Symfony\Component\Messenger\Event\SendMessageToTransportsEvent;
 use Symfony\Component\Messenger\Stamp\ReceivedStamp;
 use Symfony\Component\Messenger\Stamp\RedeliveryStamp;
 use Symfony\Component\Messenger\Stamp\SentStamp;
 use Symfony\Component\Messenger\Transport\Sender\SendersLocatorInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Samuel Roze <samuel.roze@gmail.com>
diff --git a/src/Symfony/Component/Messenger/Tests/Middleware/SendMessageMiddlewareTest.php b/src/Symfony/Component/Messenger/Tests/Middleware/SendMessageMiddlewareTest.php
index 8237838a3a0b5..fa2ee76bd5b5c 100644
--- a/src/Symfony/Component/Messenger/Tests/Middleware/SendMessageMiddlewareTest.php
+++ b/src/Symfony/Component/Messenger/Tests/Middleware/SendMessageMiddlewareTest.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\Messenger\Tests\Middleware;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Messenger\Envelope;
 use Symfony\Component\Messenger\Event\SendMessageToTransportsEvent;
 use Symfony\Component\Messenger\Middleware\SendMessageMiddleware;
@@ -24,6 +23,7 @@
 use Symfony\Component\Messenger\Tests\Fixtures\DummyMessageInterface;
 use Symfony\Component\Messenger\Transport\Sender\SenderInterface;
 use Symfony\Component\Messenger\Transport\Sender\SendersLocator;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class SendMessageMiddlewareTest extends MiddlewareTestCase
 {
diff --git a/src/Symfony/Component/Messenger/Tests/WorkerTest.php b/src/Symfony/Component/Messenger/Tests/WorkerTest.php
index cd833b223dce2..4ecb7719cbaef 100644
--- a/src/Symfony/Component/Messenger/Tests/WorkerTest.php
+++ b/src/Symfony/Component/Messenger/Tests/WorkerTest.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Messenger\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Messenger\Envelope;
 use Symfony\Component\Messenger\Event\WorkerMessageFailedEvent;
 use Symfony\Component\Messenger\Event\WorkerMessageHandledEvent;
@@ -26,6 +25,7 @@
 use Symfony\Component\Messenger\Tests\Fixtures\CallbackReceiver;
 use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
 use Symfony\Component\Messenger\Worker;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class WorkerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Messenger/Worker.php b/src/Symfony/Component/Messenger/Worker.php
index 19c5a4b0fafea..72319c014c9ba 100644
--- a/src/Symfony/Component/Messenger/Worker.php
+++ b/src/Symfony/Component/Messenger/Worker.php
@@ -12,8 +12,6 @@
 namespace Symfony\Component\Messenger;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\Event;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Messenger\Event\WorkerMessageFailedEvent;
 use Symfony\Component\Messenger\Event\WorkerMessageHandledEvent;
 use Symfony\Component\Messenger\Event\WorkerMessageReceivedEvent;
@@ -25,6 +23,7 @@
 use Symfony\Component\Messenger\Stamp\RedeliveryStamp;
 use Symfony\Component\Messenger\Stamp\SentStamp;
 use Symfony\Component\Messenger\Transport\Receiver\ReceiverInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Samuel Roze <samuel.roze@gmail.com>
@@ -141,7 +140,7 @@ public function run()
         });
     }
 
-    private function dispatchEvent(Event $event)
+    private function dispatchEvent($event)
     {
         if (null === $this->eventDispatcher) {
             return;
diff --git a/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php b/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
index fca4add09c3a3..9a64565c523a0 100644
--- a/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
+++ b/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
@@ -51,6 +51,9 @@ public function __construct(iterable $providers, bool $eraseCredentials = true)
         $this->eraseCredentials = $eraseCredentials;
     }
 
+    /**
+     * @final since Symfony 4.3, the type-hint will be updated to the interface from symfony/contracts in 5.0
+     */
     public function setEventDispatcher(EventDispatcherInterface $dispatcher)
     {
         $this->eventDispatcher = LegacyEventDispatcherProxy::decorate($dispatcher);
diff --git a/src/Symfony/Component/Security/Core/Authorization/Voter/TraceableVoter.php b/src/Symfony/Component/Security/Core/Authorization/Voter/TraceableVoter.php
index 6dbff4466a746..e5ce1f696be36 100644
--- a/src/Symfony/Component/Security/Core/Authorization/Voter/TraceableVoter.php
+++ b/src/Symfony/Component/Security/Core/Authorization/Voter/TraceableVoter.php
@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\Security\Core\Authorization\Voter;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Event\VoteEvent;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * Decorates voter classes to send result events.
@@ -30,14 +31,14 @@ class TraceableVoter implements VoterInterface
     public function __construct(VoterInterface $voter, EventDispatcherInterface $eventDispatcher)
     {
         $this->voter = $voter;
-        $this->eventDispatcher = $eventDispatcher;
+        $this->eventDispatcher = LegacyEventDispatcherProxy::decorate($eventDispatcher);
     }
 
     public function vote(TokenInterface $token, $subject, array $attributes)
     {
         $result = $this->voter->vote($token, $subject, $attributes);
 
-        $this->eventDispatcher->dispatch('debug.security.authorization.vote', new VoteEvent($this->voter, $subject, $attributes, $result));
+        $this->eventDispatcher->dispatch(new VoteEvent($this->voter, $subject, $attributes, $result), 'debug.security.authorization.vote');
 
         return $result;
     }
diff --git a/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/TraceableVoterTest.php b/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/TraceableVoterTest.php
index 99bf1f6eff90a..53e6a277453f5 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/TraceableVoterTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/TraceableVoterTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Security\Core\Tests\Authorization\Voter;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authorization\Voter\TraceableVoter;
 use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 use Symfony\Component\Security\Core\Event\VoteEvent;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class TraceableVoterTest extends TestCase
 {
@@ -44,7 +44,7 @@ public function testVote()
         $eventDispatcher
             ->expects($this->once())
             ->method('dispatch')
-            ->with('debug.security.authorization.vote', new VoteEvent($voter, 'anysubject', ['attr1'], VoterInterface::ACCESS_DENIED));
+            ->with(new VoteEvent($voter, 'anysubject', ['attr1'], VoterInterface::ACCESS_DENIED), 'debug.security.authorization.vote');
 
         $sut = new TraceableVoter($voter, $eventDispatcher);
         $result = $sut->vote($token, 'anysubject', ['attr1']);
diff --git a/src/Symfony/Component/Security/Core/composer.json b/src/Symfony/Component/Security/Core/composer.json
index 42691b86c38aa..05c1c3dbbe835 100644
--- a/src/Symfony/Component/Security/Core/composer.json
+++ b/src/Symfony/Component/Security/Core/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/contracts": "^1.0"
+        "symfony/contracts": "^1.1"
     },
     "require-dev": {
         "psr/container": "^1.0",
diff --git a/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php b/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php
index 780dd93b44049..f146f59fd685e 100644
--- a/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php
+++ b/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\Security\Guard;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -22,6 +21,7 @@
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * A utility class that does much of the *work* during the guard authentication process.
diff --git a/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php b/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php
index 9b513c42f941c..8cca27f875fae 100644
--- a/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php
+++ b/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php
@@ -14,11 +14,15 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Guard\AuthenticatorInterface;
 use Symfony\Component\Security\Guard\GuardAuthenticatorHandler;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
+use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class GuardAuthenticatorHandlerTest extends TestCase
 {
@@ -158,11 +162,11 @@ public function testSessionStrategyIsNotCalledWhenStateless()
 
     protected function setUp()
     {
-        $this->tokenStorage = $this->getMockBuilder('Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface')->getMock();
-        $this->dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
-        $this->token = $this->getMockBuilder('Symfony\Component\Security\Core\Authentication\Token\TokenInterface')->getMock();
+        $this->tokenStorage = $this->getMockBuilder(TokenStorageInterface::class)->getMock();
+        $this->dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
+        $this->token = $this->getMockBuilder(TokenInterface::class)->getMock();
         $this->request = new Request([], [], [], [], [], []);
-        $this->sessionStrategy = $this->getMockBuilder('Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface')->getMock();
+        $this->sessionStrategy = $this->getMockBuilder(SessionAuthenticationStrategyInterface::class)->getMock();
         $this->guardAuthenticator = $this->getMockBuilder(AuthenticatorInterface::class)->getMock();
     }
 
diff --git a/src/Symfony/Component/Security/Http/Firewall.php b/src/Symfony/Component/Security/Http/Firewall.php
index bff8e3e884c49..7cd51ce21e872 100644
--- a/src/Symfony/Component/Security/Http/Firewall.php
+++ b/src/Symfony/Component/Security/Http/Firewall.php
@@ -38,6 +38,8 @@ class Firewall implements EventSubscriberInterface
 
     public function __construct(FirewallMapInterface $map, EventDispatcherInterface $dispatcher)
     {
+        // the type-hint will be updated to the "EventDispatcherInterface" from symfony/contracts in 5.0
+
         $this->map = $map;
         $this->dispatcher = $dispatcher;
         $this->exceptionListeners = new \SplObjectStorage();
diff --git a/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php
index 06a3b2d2a7eb3..58e188cc4c567 100644
--- a/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -31,6 +30,7 @@
 use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * The AbstractAuthenticationListener is the preferred base class for all
diff --git a/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php b/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php
index 60817ecd1c63d..500ae43e498bd 100644
--- a/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Event\RequestEvent;
@@ -25,6 +24,7 @@
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * AbstractPreAuthenticatedListener is the base class for all listener that
diff --git a/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php b/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php
index bfd4d5be298a4..76a5a9107b4c2 100644
--- a/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php
@@ -39,7 +39,7 @@
  *
  * @author Fabien Potencier <fabien@symfony.com>
  *
- * @final since Symfony 4.3
+ * @final since Symfony 4.3, EventDispatcherInterface type-hints will be updated to the interface from symfony/contracts in 5.0
  */
 class ExceptionListener
 {
diff --git a/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php b/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php
index 16073859f85b6..ebc03db862952 100644
--- a/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpKernel\Event\RequestEvent;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
@@ -23,6 +22,7 @@
 use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategy;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * RememberMeListener implements authentication capabilities via a cookie.
diff --git a/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php
index d384b2f286179..592e0127e5122 100644
--- a/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * REMOTE_USER authentication listener.
diff --git a/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php b/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
index 092b334ae6ff6..c94eb7e89b380 100644
--- a/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
@@ -30,6 +29,7 @@
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Http\Event\SwitchUserEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * SwitchUserListener allows a user to impersonate another one temporarily
diff --git a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php
index 2b8ab8d09f578..4cc0677af86c5 100644
--- a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
@@ -28,6 +27,7 @@
 use Symfony\Component\Security\Http\HttpUtils;
 use Symfony\Component\Security\Http\ParameterBagUtils;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * UsernamePasswordFormAuthenticationListener is the default implementation of
diff --git a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
index 90a8225b35dca..ab991572f11cf 100644
--- a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;
@@ -35,6 +34,7 @@
 use Symfony\Component\Security\Http\HttpUtils;
 use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * UsernamePasswordJsonAuthenticationListener is a stateless implementation of
diff --git a/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php
index 2d3c26f28c3cd..fc770ae936fb2 100644
--- a/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * X509 authentication listener.
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php
index fe237e3dbf043..1be9bf88e22f7 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php
@@ -18,6 +18,7 @@
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\Firewall\RememberMeListener;
 use Symfony\Component\Security\Http\SecurityEvents;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class RememberMeListenerTest extends TestCase
 {
@@ -447,7 +448,7 @@ protected function getTokenStorage()
 
     protected function getDispatcher()
     {
-        return $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        return $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
     }
 
     private function getSessionStrategy()
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
index c8b3ed245cb67..6fd60c0c02bbd 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
@@ -23,6 +23,7 @@
 use Symfony\Component\Security\Http\Event\SwitchUserEvent;
 use Symfony\Component\Security\Http\Firewall\SwitchUserListener;
 use Symfony\Component\Security\Http\SecurityEvents;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class SwitchUserListenerTest extends TestCase
 {
@@ -138,7 +139,7 @@ public function testExitUserDispatchesEventWithRefreshedUser()
         $this->tokenStorage->setToken(new SwitchUserToken('username', '', 'key', [new SwitchUserRole('ROLE_PREVIOUS', $originalToken, false)], $originalToken));
         $this->request->query->set('_switch_user', SwitchUserListener::EXIT_VALUE);
 
-        $dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        $dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
         $dispatcher
             ->expects($this->once())
             ->method('dispatch')
@@ -165,7 +166,7 @@ public function testExitUserDoesNotDispatchEventWithStringUser()
         $this->tokenStorage->setToken(new SwitchUserToken('username', '', 'key', [new SwitchUserRole('ROLE_PREVIOUS', $originalToken, false)], $originalToken));
         $this->request->query->set('_switch_user', SwitchUserListener::EXIT_VALUE);
 
-        $dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        $dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
         $dispatcher
             ->expects($this->never())
             ->method('dispatch')
@@ -267,7 +268,7 @@ public function testSwitchUserWithReplacedToken()
             ->method('loadUserByUsername')->with('kuba')
             ->will($this->returnValue($user));
 
-        $dispatcher = $this->getMockBuilder('Symfony\Component\EventDispatcher\EventDispatcherInterface')->getMock();
+        $dispatcher = $this->getMockBuilder(EventDispatcherInterface::class)->getMock();
         $dispatcher
             ->expects($this->once())
             ->method('dispatch')
diff --git a/src/Symfony/Component/Security/composer.json b/src/Symfony/Component/Security/composer.json
index fddc5165910f2..7a0e0c23107c3 100644
--- a/src/Symfony/Component/Security/composer.json
+++ b/src/Symfony/Component/Security/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/contracts": "^1.0",
+        "symfony/contracts": "^1.1",
         "symfony/http-foundation": "~3.4|~4.0",
         "symfony/http-kernel": "^4.3",
         "symfony/property-access": "~3.4|~4.0"
diff --git a/src/Symfony/Component/Workflow/StateMachine.php b/src/Symfony/Component/Workflow/StateMachine.php
index ad6a26c2d883c..c9f88a022bfe6 100644
--- a/src/Symfony/Component/Workflow/StateMachine.php
+++ b/src/Symfony/Component/Workflow/StateMachine.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Workflow;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Workflow\MarkingStore\MarkingStoreInterface;
 use Symfony\Component\Workflow\MarkingStore\SingleStateMarkingStore;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
diff --git a/src/Symfony/Component/Workflow/Tests/RegistryTest.php b/src/Symfony/Component/Workflow/Tests/RegistryTest.php
index 867046f7c5db3..a13c43549758e 100644
--- a/src/Symfony/Component/Workflow/Tests/RegistryTest.php
+++ b/src/Symfony/Component/Workflow/Tests/RegistryTest.php
@@ -3,13 +3,13 @@
 namespace Symfony\Component\Workflow\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Workflow\Definition;
 use Symfony\Component\Workflow\MarkingStore\MarkingStoreInterface;
 use Symfony\Component\Workflow\Registry;
 use Symfony\Component\Workflow\SupportStrategy\SupportStrategyInterface;
 use Symfony\Component\Workflow\SupportStrategy\WorkflowSupportStrategyInterface;
 use Symfony\Component\Workflow\Workflow;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 class RegistryTest extends TestCase
 {
diff --git a/src/Symfony/Component/Workflow/Workflow.php b/src/Symfony/Component/Workflow/Workflow.php
index ca6b8f229115a..188d69e7d3c25 100644
--- a/src/Symfony/Component/Workflow/Workflow.php
+++ b/src/Symfony/Component/Workflow/Workflow.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\Workflow;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\Workflow\Event\AnnounceEvent;
 use Symfony\Component\Workflow\Event\CompletedEvent;
@@ -26,6 +25,7 @@
 use Symfony\Component\Workflow\MarkingStore\MarkingStoreInterface;
 use Symfony\Component\Workflow\MarkingStore\MultipleStateMarkingStore;
 use Symfony\Component\Workflow\Metadata\MetadataStoreInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Contracts/CHANGELOG.md b/src/Symfony/Contracts/CHANGELOG.md
index b37bc2a705314..b5f1d76aecda5 100644
--- a/src/Symfony/Contracts/CHANGELOG.md
+++ b/src/Symfony/Contracts/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * added `HttpClient` namespace with contracts for implementing flexible HTTP clients
+ * added `EventDispatcher\EventDispatcherInterface`
 
 1.0.0
 -----
diff --git a/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php b/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php
new file mode 100644
index 0000000000000..9b1a69add2336
--- /dev/null
+++ b/src/Symfony/Contracts/EventDispatcher/EventDispatcherInterface.php
@@ -0,0 +1,58 @@
+<?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\Contracts\EventDispatcher;
+
+use Psr\EventDispatcher\EventDispatcherInterface as PsrEventDispatcherInterface;
+
+if (interface_exists(PsrEventDispatcherInterface::class)) {
+    /**
+     * Allows providing hooks on domain-specific lifecycles by dispatching events.
+     */
+    interface EventDispatcherInterface extends PsrEventDispatcherInterface
+    {
+        /**
+         * Dispatches an event to all registered listeners.
+         *
+         * For BC with Symfony 4, the $eventName argument is not declared explicitly on the
+         * signature of the method. Implementations that are not bound by this BC contraint
+         * MUST declare it explicitly, as allowed by PHP.
+         *
+         * @param object      $event     The event to pass to the event handlers/listeners
+         * @param string|null $eventName The name of the event to dispatch. If not supplied,
+         *                               the class of $event should be used instead.
+         *
+         * @return object The passed $event MUST be returned
+         */
+        public function dispatch($event/*, string $eventName = null*/);
+    }
+} else {
+    /**
+     * Allows providing hooks on domain-specific lifecycles by dispatching events.
+     */
+    interface EventDispatcherInterface
+    {
+        /**
+         * Dispatches an event to all registered listeners.
+         *
+         * For BC with Symfony 4, the $eventName argument is not declared explicitly on the
+         * signature of the method. Implementations that are not bound by this BC contraint
+         * MUST declare it explicitly, as allowed by PHP.
+         *
+         * @param object      $event     The event to pass to the event handlers/listeners
+         * @param string|null $eventName The name of the event to dispatch. If not supplied,
+         *                               the class of $event should be used instead.
+         *
+         * @return object The passed $event MUST be returned
+         */
+        public function dispatch($event/*, string $eventName = null*/);
+    }
+}
diff --git a/src/Symfony/Contracts/composer.json b/src/Symfony/Contracts/composer.json
index f881258dc1a4a..b83e7c0535cfc 100644
--- a/src/Symfony/Contracts/composer.json
+++ b/src/Symfony/Contracts/composer.json
@@ -27,6 +27,7 @@
         "psr/cache": "When using the Cache contracts",
         "psr/container": "When using the Service contracts",
         "symfony/cache-contracts-implementation": "",
+        "symfony/event-dispatcher-implementation": "",
         "symfony/http-client-contracts-implementation": "",
         "symfony/service-contracts-implementation": "",
         "symfony/translation-contracts-implementation": ""

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