diff --git a/.travis.yml b/.travis.yml
index 6002f3c..511ede7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -68,7 +68,7 @@ jobs:
     - stage: "Analysis"
       name: "phpstan"
       script:
-        - docker-compose run --no-deps --rm php bin/phpstan analyze -l7 src/ tests/
+        - docker-compose run --no-deps --rm php bin/phpstan analyze --memory-limit -l7 src/ tests/
 
     - stage: "Analysis"
       name: "cs-check"
diff --git a/src/Capsule/Collection.php b/src/Capsule/Collection.php
index f00ee63..2c66a4b 100644
--- a/src/Capsule/Collection.php
+++ b/src/Capsule/Collection.php
@@ -4,13 +4,13 @@
 
 namespace Facile\MongoDbBundle\Capsule;
 
+use Facile\MongoDbBundle\Event\EventDispatcherCheck;
 use Facile\MongoDbBundle\Event\QueryEvent;
 use Facile\MongoDbBundle\Models\Query;
 use MongoDB\Collection as MongoCollection;
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\ReadPreference;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 
 /**
  * Class Collection.
@@ -221,7 +221,7 @@ private function prepareQuery(string $method, $filters = null, $data = null, arr
         );
 
         $event = new QueryEvent($query);
-        if (class_exists(LegacyEventDispatcherProxy::class)) {
+        if (EventDispatcherCheck::isPSR14Compliant()) {
             $this->eventDispatcher->dispatch($event, QueryEvent::QUERY_PREPARED);
         } else {
             $this->eventDispatcher->dispatch(QueryEvent::QUERY_PREPARED, $event);
@@ -261,7 +261,7 @@ private function notifyQueryExecution(Query $queryLog)
         $queryLog->setExecutionTime(microtime(true) - $queryLog->getStart());
 
         $event = new QueryEvent($queryLog);
-        if (class_exists(LegacyEventDispatcherProxy::class)) {
+        if (EventDispatcherCheck::isPSR14Compliant()) {
             $this->eventDispatcher->dispatch($event, QueryEvent::QUERY_EXECUTED);
         } else {
             $this->eventDispatcher->dispatch(QueryEvent::QUERY_EXECUTED, $event);
diff --git a/src/DependencyInjection/MongoDbBundleExtension.php b/src/DependencyInjection/MongoDbBundleExtension.php
index 83bfe3d..4f46ece 100644
--- a/src/DependencyInjection/MongoDbBundleExtension.php
+++ b/src/DependencyInjection/MongoDbBundleExtension.php
@@ -5,6 +5,7 @@
 namespace Facile\MongoDbBundle\DependencyInjection;
 
 use Facile\MongoDbBundle\Event\ConnectionEvent;
+use Facile\MongoDbBundle\Event\EventDispatcherCheck;
 use Facile\MongoDbBundle\Event\QueryEvent;
 use Facile\MongoDbBundle\Services\ClientRegistry;
 use Facile\MongoDbBundle\Services\ConnectionFactory;
@@ -16,6 +17,8 @@
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 /**
@@ -34,6 +37,7 @@ public function load(array $configs, ContainerBuilder $container)
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
         $loader->load('services.xml');
 
+        $this->decorateEventDispatcher($container);
         $this->defineClientRegistry($config, $container->getParameter('kernel.debug'));
         $this->defineConnectionFactory();
         $this->defineConnections($config['connections']);
@@ -118,4 +122,17 @@ private function defineDriverOptionsFactory(array $config)
     {
         return isset($config['driverOptions']) ? new Reference($config['driverOptions']) : null;
     }
+
+    /**
+     * This is needed to avoid the EventDispatcher deprecation from 4.3
+     */
+    private function decorateEventDispatcher(): void
+    {
+        if (EventDispatcherCheck::shouldUseLegacyProxy()) {
+            $definition = $this->containerBuilder->getDefinition('facile_mongo_db.event_dispatcher');
+            $definition->setClass(LegacyEventDispatcherProxy::class);
+            $definition->setFactory([LegacyEventDispatcherProxy::class, 'decorate']);
+            $definition->setArguments([new Definition(EventDispatcher::class)]);
+        }
+    }
 }
diff --git a/src/Event/EventDispatcherCheck.php b/src/Event/EventDispatcherCheck.php
new file mode 100644
index 0000000..9665e93
--- /dev/null
+++ b/src/Event/EventDispatcherCheck.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Facile\MongoDbBundle\Event;
+
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
+
+/**
+ * This class provides the checks needed to avoid the EventDispatcher deprecations from 4.3
+ * The Event class has been removed in Symfony 5, so its absence is used as a trigger to stop using the LegacyEventDispatcherProxy.
+ */
+class EventDispatcherCheck
+{
+    public static function isPSR14Compliant(): bool
+    {
+        return ! class_exists(Event::class) || class_exists(LegacyEventDispatcherProxy::class);
+    }
+
+    public static function shouldUseLegacyProxy(): bool
+    {
+        return class_exists(Event::class) && class_exists(LegacyEventDispatcherProxy::class);
+    }
+}
diff --git a/src/Services/ClientRegistry.php b/src/Services/ClientRegistry.php
index 2dcd638..3409863 100644
--- a/src/Services/ClientRegistry.php
+++ b/src/Services/ClientRegistry.php
@@ -6,11 +6,11 @@
 
 use Facile\MongoDbBundle\Capsule\Client as BundleClient;
 use Facile\MongoDbBundle\Event\ConnectionEvent;
+use Facile\MongoDbBundle\Event\EventDispatcherCheck;
 use Facile\MongoDbBundle\Models\ClientConfiguration;
 use Facile\MongoDbBundle\Services\DriverOptions\DriverOptionsInterface;
 use MongoDB\Client;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 
 /**
  * Class ClientRegistry.
@@ -162,7 +162,7 @@ public function getClient(string $name, string $databaseName = null): Client
             $this->clients[$clientKey] = $this->buildClient($name, $conf->getUri(), $options, $conf->getDriverOptions());
 
             $event = new ConnectionEvent($clientKey);
-            if (class_exists(LegacyEventDispatcherProxy::class)) {
+            if (EventDispatcherCheck::isPSR14Compliant()) {
                 $this->eventDispatcher->dispatch($event, ConnectionEvent::CLIENT_CREATED);
             } else {
                 $this->eventDispatcher->dispatch(ConnectionEvent::CLIENT_CREATED, $event);
diff --git a/tests/Functional/Capsule/CollectionTest.php b/tests/Functional/Capsule/CollectionTest.php
index eee420f..1dcac23 100644
--- a/tests/Functional/Capsule/CollectionTest.php
+++ b/tests/Functional/Capsule/CollectionTest.php
@@ -2,7 +2,10 @@
 
 declare(strict_types=1);
 
+namespace Facile\MongoDbBundle\Tests\Functional\Capsule;
+
 use Facile\MongoDbBundle\Capsule\Collection;
+use Facile\MongoDbBundle\Event\EventDispatcherCheck;
 use Facile\MongoDbBundle\Event\QueryEvent;
 use Facile\MongoDbBundle\Tests\Functional\AppTestCase;
 use MongoDB\Driver\Manager;
@@ -25,9 +28,9 @@ private function getManager(): Manager
     public function test_construction()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
+        $ev = $this->mockEventDispatcher(0);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         self::assertInstanceOf(\MongoDB\Collection::class, $coll);
     }
@@ -35,10 +38,9 @@ public function test_construction()
     public function test_insertOne()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->insertOne(['test' => 1]);
     }
@@ -46,10 +48,9 @@ public function test_insertOne()
     public function test_updateOne()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->updateOne(['filter' => 1], ['$set' => ['testField' => 1]]);
     }
@@ -57,10 +58,9 @@ public function test_updateOne()
     public function test_count()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->count(['test' => 1]);
     }
@@ -68,10 +68,9 @@ public function test_count()
     public function test_find()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->find([]);
     }
@@ -79,10 +78,9 @@ public function test_find()
     public function test_findOne()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->findOne([]);
     }
@@ -90,10 +88,9 @@ public function test_findOne()
     public function test_findOneAndUpdate()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->findOneAndUpdate([], ['$set' => ['country' => 'us']]);
     }
@@ -101,10 +98,9 @@ public function test_findOneAndUpdate()
     public function test_findOneAndDelete()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->findOneAndDelete([]);
     }
@@ -112,10 +108,9 @@ public function test_findOneAndDelete()
     public function test_deleteOne()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->deleteOne([]);
     }
@@ -123,10 +118,9 @@ public function test_deleteOne()
     public function test_replaceOne()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->replaceOne([], []);
     }
@@ -134,10 +128,9 @@ public function test_replaceOne()
     public function test_aggregate()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(5);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->deleteMany([]);
 
@@ -165,10 +158,9 @@ public function test_aggregate()
     public function test_deleteMany()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->deleteMany([]);
     }
@@ -176,25 +168,35 @@ public function test_deleteMany()
     public function test_distinct()
     {
         $manager = $this->getManager();
-        $ev = self::prophesize(EventDispatcherInterface::class);
-        $this->assertEventsDispatching($ev);
+        $ev = $this->mockEventDispatcher(1);
 
-        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev->reveal());
+        $coll = new Collection($manager, 'test_client', 'testdb', 'test_collection', [], $ev);
 
         $coll->distinct('field');
     }
 
-    /**
-     * @param $ev
-     */
-    protected function assertEventsDispatching($ev)
+    private function mockEventDispatcher(int $times): EventDispatcherInterface
     {
-        if (class_exists(LegacyEventDispatcherProxy::class)) {
-            $ev->dispatch(Argument::type(QueryEvent::class), QueryEvent::QUERY_PREPARED)->shouldBeCalled();
-            $ev->dispatch(Argument::type(QueryEvent::class), QueryEvent::QUERY_EXECUTED)->shouldBeCalled();
+        $ed = $this->prophesize(EventDispatcherInterface::class);
+
+        if (EventDispatcherCheck::isPSR14Compliant()) {
+            $ed->dispatch(Argument::type(QueryEvent::class), QueryEvent::QUERY_PREPARED)
+                ->shouldBeCalledTimes($times)
+                ->willReturnArgument(0);
+            $ed->dispatch(Argument::type(QueryEvent::class), QueryEvent::QUERY_EXECUTED)
+                ->shouldBeCalledTimes($times)
+                ->willReturnArgument(0);
         } else {
-            $ev->dispatch(QueryEvent::QUERY_PREPARED, Argument::type(QueryEvent::class))->shouldBeCalled();
-            $ev->dispatch(QueryEvent::QUERY_EXECUTED, Argument::type(QueryEvent::class))->shouldBeCalled();
+            $ed->dispatch(QueryEvent::QUERY_PREPARED, Argument::type(QueryEvent::class))
+                ->shouldBeCalledTimes($times);
+            $ed->dispatch(QueryEvent::QUERY_EXECUTED, Argument::type(QueryEvent::class))
+                ->shouldBeCalledTimes($times);
+        }
+
+        if (EventDispatcherCheck::shouldUseLegacyProxy()) {
+            return LegacyEventDispatcherProxy::decorate($ed->reveal());
         }
+
+        return $ed->reveal();
     }
 }
diff --git a/tests/Functional/Command/LoadFixturesCommandTest.php b/tests/Functional/Command/LoadFixturesCommandTest.php
index 9527257..05070eb 100644
--- a/tests/Functional/Command/LoadFixturesCommandTest.php
+++ b/tests/Functional/Command/LoadFixturesCommandTest.php
@@ -11,7 +11,7 @@
 
 class LoadFixturesCommandTest extends AppTestCase
 {
-    /** @var Database $conn */
+    /** @var Database */
     private $conn;
 
     protected function setUp(): void
diff --git a/tests/Unit/Services/ClientRegistryTest.php b/tests/Unit/Services/ClientRegistryTest.php
index 47b526f..24631c9 100644
--- a/tests/Unit/Services/ClientRegistryTest.php
+++ b/tests/Unit/Services/ClientRegistryTest.php
@@ -5,6 +5,7 @@
 namespace Facile\MongoDbBundle\Tests\Unit\Services;
 
 use Facile\MongoDbBundle\Event\ConnectionEvent;
+use Facile\MongoDbBundle\Event\EventDispatcherCheck;
 use Facile\MongoDbBundle\Services\ClientRegistry;
 use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
@@ -98,7 +99,7 @@ private function mockEventDispatcher(): EventDispatcherInterface
     {
         $ed = $this->prophesize(EventDispatcherInterface::class);
 
-        if (class_exists(LegacyEventDispatcherProxy::class)) {
+        if (EventDispatcherCheck::isPSR14Compliant()) {
             $ed->dispatch(Argument::type(ConnectionEvent::class), ConnectionEvent::CLIENT_CREATED)
                 ->shouldBeCalledOnce()
                 ->willReturnArgument(0);
@@ -107,6 +108,10 @@ private function mockEventDispatcher(): EventDispatcherInterface
                 ->shouldBeCalledOnce();
         }
 
+        if (EventDispatcherCheck::shouldUseLegacyProxy()) {
+            return LegacyEventDispatcherProxy::decorate($ed->reveal());
+        }
+
         return $ed->reveal();
     }
 }