diff --git a/composer.json b/composer.json
index aa57523e..8eac45f8 100644
--- a/composer.json
+++ b/composer.json
@@ -13,12 +13,18 @@
     ],
     "require": {
         "php": ">=5.3",
-        "ext-json": "*"
+        "ext-json": "*",
+        "phpunit/phpunit": "^4.8"
     },
     "autoload": {
         "psr-4": {
             "Flasher\\": "src/"
         }
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "dev",
+    "config": {
+        "platform": {
+            "php": "5.4"
+        }
+    }
 }
diff --git a/src/Laravel/composer.json b/src/Laravel/composer.json
index 9a48098d..cdd4a7b2 100644
--- a/src/Laravel/composer.json
+++ b/src/Laravel/composer.json
@@ -32,6 +32,9 @@
         "illuminate/support": "^4.0|^5.0|^6.0|^7.0|^8.0",
         "php-flasher/flasher": "dev-main"
     },
+    "require-dev": {
+        "orchestra/testbench": "^2.0|^3.0|^4.0|^5.0|^6.0"
+    },
     "autoload": {
         "psr-4": {
             "Flasher\\Laravel\\": "",
diff --git a/src/Prime/Stamp/HopsStamp.php b/src/Prime/Stamp/HopsStamp.php
index c9caea2d..e28c5319 100644
--- a/src/Prime/Stamp/HopsStamp.php
+++ b/src/Prime/Stamp/HopsStamp.php
@@ -2,7 +2,7 @@
 
 namespace Flasher\Prime\Stamp;
 
-final class HopsStamp implements StampInterface
+final class HopsStamp implements StampInterface, \Flasher\Prime\Stamp\OrderableStampInterface
 {
     /**
      * @var int
diff --git a/src/Prime/Tests/Config/ConfigTest.php b/src/Prime/Tests/Config/ConfigTest.php
index 7c5088ea..a8073984 100644
--- a/src/Prime/Tests/Config/ConfigTest.php
+++ b/src/Prime/Tests/Config/ConfigTest.php
@@ -2,7 +2,7 @@
 
 namespace Flasher\Prime\Tests\Config;
 
-use Notify\Config\Config;
+use Flasher\Prime\Config\Config;
 use PHPUnit\Framework\TestCase;
 
 final class ConfigTest extends TestCase
@@ -11,9 +11,9 @@ final class ConfigTest extends TestCase
     {
         $config = new Config(
             array(
-                'default' => 'notify',
+                'default' => 'default_flasher',
                 'drivers' => array(
-                    'notify' => array(
+                    'toastr' => array(
                         'scripts' => array('script.js'),
                         'styles'  => array('styles.css'),
                         'options' => array()
@@ -22,14 +22,14 @@ final class ConfigTest extends TestCase
             )
         );
 
-        $this->assertEquals('notify', $config->get('default'));
+        $this->assertEquals('default_flasher', $config->get('default'));
         $this->assertEquals(
             array(
                 'scripts' => array('script.js'),
                 'styles'  => array('styles.css'),
                 'options' => array()
             ),
-            $config->get('drivers.notify')
+            $config->get('drivers.toastr')
         );
         $this->assertEquals(array('styles.css'), $config->get('drivers.flasher.styles'));
         $this->assertEquals(array(), $config->get('drivers.flasher.options'));
diff --git a/src/Prime/Tests/Envelope/EnvelopeTest.php b/src/Prime/Tests/Envelope/EnvelopeTest.php
index 426b3e5e..80910194 100644
--- a/src/Prime/Tests/Envelope/EnvelopeTest.php
+++ b/src/Prime/Tests/Envelope/EnvelopeTest.php
@@ -67,7 +67,7 @@ final class EnvelopeTest extends TestCase
             $this->getMockBuilder('Flasher\Prime\Stamp\StampInterface')->getMock(),
         );
 
-        $envelope = new \Flasher\Prime\Envelope($notification, $stamps);
+        $envelope = new Envelope($notification, $stamps);
 
         $this->assertSame($notification, $envelope->getNotification());
 
diff --git a/src/Prime/Tests/Envelope/Stamp/CreatedAtStampTest.php b/src/Prime/Tests/Envelope/Stamp/CreatedAtStampTest.php
index 4c340e65..e2d688a5 100644
--- a/src/Prime/Tests/Envelope/Stamp/CreatedAtStampTest.php
+++ b/src/Prime/Tests/Envelope/Stamp/CreatedAtStampTest.php
@@ -22,8 +22,8 @@ final class CreatedAtStampTest extends TestCase
 
     public function testCompare()
     {
-        $createdAt1 = new \Flasher\Prime\Stamp\CreatedAtStamp(new \DateTime('+2 h'));
-        $createdAt2 = new \Flasher\Prime\Stamp\CreatedAtStamp(new \DateTime('+1 h'));
+        $createdAt1 = new CreatedAtStamp(new \DateTime('+2 h'));
+        $createdAt2 = new CreatedAtStamp(new \DateTime('+1 h'));
 
         $this->assertFalse($createdAt1->compare($createdAt2));
         $this->assertSame(0, $createdAt1->compare(new HopsStamp(1)));
diff --git a/src/Prime/Tests/Envelope/Stamp/LifeStampTest.php b/src/Prime/Tests/Envelope/Stamp/HopsStampTest.php
similarity index 82%
rename from src/Prime/Tests/Envelope/Stamp/LifeStampTest.php
rename to src/Prime/Tests/Envelope/Stamp/HopsStampTest.php
index f39b55ac..86dcd6d8 100644
--- a/src/Prime/Tests/Envelope/Stamp/LifeStampTest.php
+++ b/src/Prime/Tests/Envelope/Stamp/HopsStampTest.php
@@ -3,14 +3,15 @@
 namespace Flasher\Prime\Tests\Envelope\Stamp;
 
 use Flasher\Prime\Envelope;
+use Flasher\Prime\Stamp\HopsStamp;
 use PHPUnit\Framework\TestCase;
 
-final class LifeStampTest extends TestCase
+final class HopsStampTest extends TestCase
 {
     public function testConstruct()
     {
         $notification = $this->getMockBuilder('Flasher\Prime\Notification\NotificationInterface')->getMock();
-        $stamp        = new \Flasher\Prime\Stamp\HopsStamp(5);
+        $stamp        = new HopsStamp(5);
 
         $envelop = new Envelope($notification, array($stamp));
 
diff --git a/src/Prime/Tests/Envelope/Stamp/PriorityStampTest.php b/src/Prime/Tests/Envelope/Stamp/PriorityStampTest.php
index 92ba7a7a..f6469b1a 100644
--- a/src/Prime/Tests/Envelope/Stamp/PriorityStampTest.php
+++ b/src/Prime/Tests/Envelope/Stamp/PriorityStampTest.php
@@ -3,6 +3,7 @@
 namespace Flasher\Prime\Tests\Envelope\Stamp;
 
 use Flasher\Prime\Envelope;
+use Flasher\Prime\Stamp\HopsStamp;
 use Flasher\Prime\Stamp\PriorityStamp;
 use PHPUnit\Framework\TestCase;
 
@@ -23,9 +24,9 @@ final class PriorityStampTest extends TestCase
     public function testCompare()
     {
         $stamp1 = new PriorityStamp(1);
-        $stamp2 = new \Flasher\Prime\Stamp\PriorityStamp(2);
+        $stamp2 = new PriorityStamp(2);
 
         $this->assertFalse($stamp1->compare($stamp2));
-        $this->assertSame(0, $stamp1->compare(new \Flasher\Prime\Stamp\HopsStamp(1)));
+        $this->assertSame(0, $stamp1->compare(new HopsStamp(1)));
     }
 }
diff --git a/src/Prime/Tests/Envelope/Stamp/RendererStampTest.php b/src/Prime/Tests/Envelope/Stamp/RendererStampTest.php
index d5661546..5ca1ba5f 100644
--- a/src/Prime/Tests/Envelope/Stamp/RendererStampTest.php
+++ b/src/Prime/Tests/Envelope/Stamp/RendererStampTest.php
@@ -3,6 +3,7 @@
 namespace Flasher\Prime\Tests\Envelope\Stamp;
 
 use Flasher\Prime\Envelope;
+use Flasher\Prime\Stamp\HandlerStamp;
 use PHPUnit\Framework\TestCase;
 
 final class RendererStampTest extends TestCase
@@ -10,7 +11,7 @@ final class RendererStampTest extends TestCase
     public function testConstruct()
     {
         $notification = $this->getMockBuilder('Flasher\Prime\Notification\NotificationInterface')->getMock();
-        $stamp        = new \Flasher\Prime\Stamp\HandlerStamp('toastr');
+        $stamp        = new HandlerStamp('toastr');
 
         $envelop = new Envelope($notification, array($stamp));
 
diff --git a/src/Prime/Tests/Envelope/Stamp/UuidStampTest.php b/src/Prime/Tests/Envelope/Stamp/UuidStampTest.php
index b1a2ef3c..92fb432d 100644
--- a/src/Prime/Tests/Envelope/Stamp/UuidStampTest.php
+++ b/src/Prime/Tests/Envelope/Stamp/UuidStampTest.php
@@ -3,6 +3,7 @@
 namespace Flasher\Prime\Tests\Envelope\Stamp;
 
 use Flasher\Prime\Envelope;
+use Flasher\Prime\Stamp\UuidStamp;
 use PHPUnit\Framework\TestCase;
 
 final class UuidStampTest extends TestCase
@@ -10,7 +11,7 @@ final class UuidStampTest extends TestCase
     public function testConstruct()
     {
         $notification = $this->getMockBuilder('Flasher\Prime\Notification\NotificationInterface')->getMock();
-        $stamp        = new \Flasher\Prime\Stamp\UuidStamp();
+        $stamp        = new UuidStamp();
 
         $envelop = new Envelope($notification, array($stamp));
 
diff --git a/src/Prime/Tests/Filter/CriteriaBuilderTest.php b/src/Prime/Tests/Filter/CriteriaBuilderTest.php
index a661b648..ecd2d94b 100644
--- a/src/Prime/Tests/Filter/CriteriaBuilderTest.php
+++ b/src/Prime/Tests/Filter/CriteriaBuilderTest.php
@@ -10,14 +10,12 @@ final class CriteriaBuilderTest extends TestCase
 {
     public function testCriteria()
     {
-        $criteria = new CriteriaBuilder(
-            new FilterBuilder(), array(
-                                   'priority' => 1,
-                                   'life'     => 2,
-                                   'limit'    => 2,
-                                   'order_by' => 'Flasher\Prime\Stamp\HopsStamp',
-        )
-        );
+        $criteria = new CriteriaBuilder(new FilterBuilder(), array(
+            'priority' => 1,
+            'life'     => 2,
+            'limit'    => 2,
+            'order_by' => 'Flasher\Prime\Stamp\HopsStamp',
+        ));
 
         $this->assertInstanceOf('Flasher\Prime\Filter\FilterBuilder', $criteria->build());
         $this->assertNotEmpty($criteria->build()->getSpecification());
diff --git a/src/Prime/Tests/Filter/DefaultFilterTest.php b/src/Prime/Tests/Filter/DefaultFilterTest.php
index bbe974fd..feaec16e 100644
--- a/src/Prime/Tests/Filter/DefaultFilterTest.php
+++ b/src/Prime/Tests/Filter/DefaultFilterTest.php
@@ -2,7 +2,7 @@
 
 namespace Flasher\Prime\Tests\Filter;
 
-use Notify\Config\Config;
+use Flasher\Prime\Config\Config;
 use Flasher\Prime\Envelope;
 use Flasher\Prime\Middleware\AddCreatedAtStampMiddleware;
 use Flasher\Prime\Middleware\AddPriorityStampMiddleware;
diff --git a/src/Prime/Tests/Filter/FilterManagerTest.php b/src/Prime/Tests/Filter/FilterManagerTest.php
index 29ef137c..1184858f 100644
--- a/src/Prime/Tests/Filter/FilterManagerTest.php
+++ b/src/Prime/Tests/Filter/FilterManagerTest.php
@@ -2,13 +2,13 @@
 
 namespace Flasher\Prime\Tests\Filter;
 
-use Notify\Config\Config;
+use Flasher\Prime\Config\Config;
 use Flasher\Prime\Envelope;
 use Flasher\Prime\Filter\FilterBuilder;
 use Flasher\Prime\Filter\Specification\PrioritySpecification;
 use Flasher\Prime\Middleware\AddCreatedAtStampMiddleware;
 use Flasher\Prime\Middleware\AddPriorityStampMiddleware;
-use Flasher\Prime\MiddlewareFlasher\PrimeBus;
+use Flasher\Prime\Middleware\FlasherBus;
 use Flasher\Prime\Stamp\PriorityStamp;
 use PHPUnit\Framework\TestCase;
 
@@ -54,7 +54,7 @@ final class FilterManagerTest extends TestCase
             )
         );
 
-        $middleware = new NotifyBus($config);
+        $middleware = new FlasherBus($config);
 
         $envelopes = array();
         foreach ($notifications as $notification) {
diff --git a/src/Prime/Tests/Manager/ManagerTest.php b/src/Prime/Tests/Manager/ManagerTest.php
index d37b1677..f200a426 100644
--- a/src/Prime/Tests/Manager/ManagerTest.php
+++ b/src/Prime/Tests/Manager/ManagerTest.php
@@ -2,32 +2,32 @@
 
 namespace Flasher\Prime\Tests\Manager;
 
-use NotifyFlasher\Prime;
+use Flasher\Prime\Flasher;
 use Flasher\Prime\Tests\TestCase;
 
 final class ManagerTest extends TestCase
 {
     public function testDefaultDriver()
     {
-        $config = $this->getMockBuilder('Notify\Config\ConfigInterface')->getMock();
+        $config = $this->getMockBuilder('Flasher\Prime\Config\ConfigInterface')->getMock();
         $config->method('get')
             ->with('default')
             ->willReturn('default_notifier');
 
-        $manager = new Notify($config);
+        $manager = new Flasher($config);
         $this->assertEquals('default_notifier', $manager->getDefaultDriver());
     }
 
     public function testMakeDriver()
     {
-        $config = $this->getMockBuilder('Notify\Config\ConfigInterface')->getMock();
+        $config = $this->getMockBuilder('Flasher\Prime\Config\ConfigInterface')->getMock();
         $config->method('get')
             ->with('default')
             ->willReturn('default_notifier');
 
-        $manager = new Notify($config);
+        $manager = new Flasher($config);
 
-        $producer = $this->getMockBuilder('NotifyFlasher\PrimeFactory')->getMock();
+        $producer = $this->getMockBuilder('Flasher\Prime\Factory\FlasherFactoryInterface')->getMock();
         $producer->method('supports')->willReturn(true);
         $manager->addDriver($producer);
 
@@ -38,14 +38,14 @@ final class ManagerTest extends TestCase
     {
         $this->setExpectedException('InvalidArgumentException', 'Driver [test_driver] not supported.');
 
-        $config = $this->getMockBuilder('Notify\Config\ConfigInterface')->getMock();
+        $config = $this->getMockBuilder('Flasher\Prime\Config\ConfigInterface')->getMock();
         $config->method('get')
             ->with('default')
             ->willReturn('default_notifier');
 
-        $manager = new Notify($config);
+        $manager = new Flasher($config);
 
-        $producer = $this->getMockBuilder('NotifyFlasher\PrimeFactory')->getMock();
+        $producer = $this->getMockBuilder('Flasher\Prime\Factory\FlasherFactoryInterface')->getMock();
         $manager->addDriver($producer);
 
         $manager->make('test_driver');
diff --git a/src/Prime/Tests/Middleware/MiddlewareStackTest.php b/src/Prime/Tests/Middleware/FlasherBusTest.php
similarity index 93%
rename from src/Prime/Tests/Middleware/MiddlewareStackTest.php
rename to src/Prime/Tests/Middleware/FlasherBusTest.php
index c7a40056..69a3d39e 100644
--- a/src/Prime/Tests/Middleware/MiddlewareStackTest.php
+++ b/src/Prime/Tests/Middleware/FlasherBusTest.php
@@ -6,11 +6,11 @@ use Flasher\Prime\Config\Config;
 use Flasher\Prime\Envelope;
 use Flasher\Prime\Middleware\AddCreatedAtStampMiddleware;
 use Flasher\Prime\Middleware\AddPriorityStampMiddleware;
-use Flasher\Prime\Middleware\MiddlewareManager;
+use Flasher\Prime\Middleware\FlasherBus;
 use Flasher\Prime\Stamp\PriorityStamp;
 use PHPUnit\Framework\TestCase;
 
-final class MiddlewareStackTest extends TestCase
+final class FlasherBusTest extends TestCase
 {
     public function testHandle()
     {
@@ -29,7 +29,7 @@ final class MiddlewareStackTest extends TestCase
             )
         ));
 
-        $stack = new MiddlewareManager($config);
+        $stack = new FlasherBus($config);
 
         $notification = $this->getMockBuilder('Flasher\Prime\Notification\NotificationInterface')->getMock();
         $envelope     = new Envelope($notification);
@@ -66,7 +66,7 @@ final class MiddlewareStackTest extends TestCase
             )
         ));
 
-        $stack = new MiddlewareManager($config);
+        $stack = new FlasherBus($config);
 
         $notification = $this->getMockBuilder('Flasher\Prime\Notification\NotificationInterface')->getMock();
         $stamps       = array(
diff --git a/src/Prime/Tests/Producer/ProducerManagerTest.php b/src/Prime/Tests/Producer/ProducerManagerTest.php
deleted file mode 100644
index ab0874a5..00000000
--- a/src/Prime/Tests/Producer/ProducerManagerTest.php
+++ /dev/null
@@ -1,72 +0,0 @@
-<?php
-
-namespace Flasher\Prime\Tests\Factory;
-
-use Flasher\Prime\EventDispatcher\Event\BeforeFilter;
-use Flasher\Prime\EventDispatcher\EventDispatcher;
-use Flasher\Prime\EventDispatcher\FlusherEvents;
-use Flasher\Prime\Notification\Notification;
-use Flasher\Prime\Tests\TestCase;
-use ReflectionClass;
-
-final class ProducerManagerTest extends TestCase
-{
-    public function testExtendToAddMoreNotifiersFactory()
-    {
-        $config  = $this->getMockBuilder('Notify\Config\ConfigInterface')->getMock();
-        $manager = new Flasher\PrimeFlasher\Prime($config);
-
-        $producer = $this->getMockBuilder('NotifyFlasher\PrimeFactory')->getMock();
-        $producer->method('supports')->willReturn(true);
-        $manager->addDriver($producer);
-
-        $reflection = new ReflectionClass(get_class($manager));
-        $extensions = $reflection->getProperty('drivers');
-        $extensions->setAccessible(true);
-
-        $drivers = $extensions->getValue($manager);
-        $this->assertCount(1, $drivers);
-
-        $producer1 = $manager->make('producer_1');
-        $this->assertSame($producer, $producer1);
-    }
-
-    public function testNullDriver()
-    {
-        $this->setExpectedException('InvalidArgumentException', 'Driver [] not supported.');
-
-        $config = $this->getMockBuilder('Notify\Config\ConfigInterface')->getMock();
-        $config->method('get')->willReturn(null);
-
-        $manager = new \Flasher\PrimeFlasher\Prime($config);
-
-        $producer = $this->getMockBuilder('NotifyFlasher\PrimeFactory')->getMock();
-        $manager->addDriver($producer);
-
-        $this->assertSame($producer, $manager->make());
-    }
-
-    public function testNotSupportedDriver()
-    {
-        $this->setExpectedException('InvalidArgumentException', 'Driver [not_supported] not supported.');
-
-        $config  = $this->getMockBuilder('Notify\Config\ConfigInterface')->getMock();
-        $manager = new Flasher\PrimeFlasher\Prime($config);
-
-        $producer = $this->getMockBuilder('NotifyFlasher\PrimeFactory')->getMock();
-        $manager->addDriver($producer);
-
-        $this->assertSame($producer, $manager->make('not_supported'));
-    }
-
-    public function testDispatcher()
-    {
-        $dispatcher = new EventDispatcher();
-        $dispatcher->addListener(FlusherEvents::NOTIFICATION_CLEARED, function ($event) {
-
-            return $event;
-        });
-
-        $dispatcher->dispatch(new Notification());
-    }
-}
diff --git a/src/Prime/Tests/Storage/StorageManagerTest.php b/src/Prime/Tests/Storage/StorageManagerTest.php
index 9ef22b1f..5d81d3fb 100644
--- a/src/Prime/Tests/Storage/StorageManagerTest.php
+++ b/src/Prime/Tests/Storage/StorageManagerTest.php
@@ -3,6 +3,7 @@
 namespace Flasher\Prime\Tests\Storage;
 
 use Flasher\Prime\Envelope;
+use Flasher\Prime\EventDispatcher\EventDispatcher;
 use Flasher\Prime\Notification\Notification;
 use Flasher\Prime\Stamp\HopsStamp;
 use Flasher\Prime\Stamp\UuidStamp;
@@ -14,7 +15,7 @@ class StorageManagerTest extends TestCase
 {
     public function testAll()
     {
-        $storageManager = new StorageManager(new ArrayStorage());
+        $storageManager = new StorageManager(new ArrayStorage(), new EventDispatcher());
         $envelopes      = array();
 
         foreach (range(0, 4) as $index) {
@@ -27,7 +28,7 @@ class StorageManagerTest extends TestCase
 
     public function testClear()
     {
-        $storageManager = new StorageManager(new ArrayStorage());
+        $storageManager = new StorageManager(new ArrayStorage(), new EventDispatcher());
         $envelopes      = array();
 
         foreach (range(0, 4) as $index) {
@@ -42,7 +43,7 @@ class StorageManagerTest extends TestCase
 
     public function testAdd()
     {
-        $storageManager = new StorageManager(new ArrayStorage());
+        $storageManager = new StorageManager(new ArrayStorage(),new EventDispatcher());
         $storageManager->add(new Envelope(new Notification('success')));
 
         $envelopes = $storageManager->all();
@@ -55,7 +56,7 @@ class StorageManagerTest extends TestCase
 
     public function testFlush()
     {
-        $storageManager = new StorageManager(new ArrayStorage());
+        $storageManager = new StorageManager(new ArrayStorage(), new EventDispatcher());
 
         $envelope = new Envelope(
             new Notification('error message', 'error'),
diff --git a/src/Prime/Tests/Stubs/Producer/FakeProducer.php b/src/Prime/Tests/Stubs/Producer/FakeProducer.php
deleted file mode 100644
index 51687b69..00000000
--- a/src/Prime/Tests/Stubs/Producer/FakeProducer.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-namespace Flasher\Prime\Tests\Stubs\Factory;
-
-use Flasher\Prime\AbstractFlasher;
-
-class FakeProducer extends AbstractFlasher
-{
-    public function getRenderer()
-    {
-        return 'fake';
-    }
-}
diff --git a/src/Prime/Tests/Stubs/Renderer/FakeRenderer.php b/src/Prime/Tests/Stubs/Renderer/FakeRenderer.php
deleted file mode 100644
index 71936657..00000000
--- a/src/Prime/Tests/Stubs/Renderer/FakeRenderer.php
+++ /dev/null
@@ -1,37 +0,0 @@
-<?php
-
-namespace Flasher\Prime\Tests\Stubs\Renderer;
-
-use Flasher\Prime\Envelope;
-use Flasher\Prime\Renderer\HasGlobalOptionsInterface;
-use Flasher\Prime\Renderer\HasScriptsInterface;
-use Flasher\Prime\Renderer\HasStylesInterface;
-use Flasher\Prime\Renderer\RendererInterface;
-
-class FakeRenderer implements RendererInterface, HasScriptsInterface, HasGlobalOptionsInterface, HasStylesInterface
-{
-    public function renderOptions()
-    {
-        return 'fake.options = []';
-    }
-
-    public function getScripts()
-    {
-        return array('jquery.min.js', 'fake.min.js');
-    }
-
-    public function getStyles()
-    {
-        return array('fake.min.css');
-    }
-
-    public function render(Envelope $envelope)
-    {
-        return sprintf(
-            "fake.%s('%s', '%s');",
-            $envelope->getType(),
-            $envelope->getMessage(),
-            $envelope->getTitle()
-        );
-    }
-}
diff --git a/src/Prime/composer.json b/src/Prime/composer.json
index b42998f6..385fbf44 100644
--- a/src/Prime/composer.json
+++ b/src/Prime/composer.json
@@ -27,6 +27,9 @@
     "require": {
         "php": ">=5.3"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^4.8|^5.0|^6.0|^7.0|^8.0|^9.0"
+    },
     "autoload": {
         "psr-4": {
             "Flasher\\Prime\\": "",
diff --git a/src/Symfony/composer.json b/src/Symfony/composer.json
index cf6e9d4a..ad04c89d 100644
--- a/src/Symfony/composer.json
+++ b/src/Symfony/composer.json
@@ -36,7 +36,6 @@
         "symfony/yaml": "^2.7|^3.0|^4.0|^5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8|^5.7|^6.0|^7.0|^8.3|^9.0",
         "twig/twig": "^1.34|^2.0|^3.0"
     },
     "suggest": {