diff --git a/composer.json b/composer.json
index 3b9ebf1e..3c5462b7 100644
--- a/composer.json
+++ b/composer.json
@@ -1,40 +1,49 @@
 {
-    "name": "cboden/ratchet"
-  , "type": "library"
-  , "description": "PHP WebSocket library"
-  , "keywords": ["WebSockets", "Server", "Ratchet", "Sockets", "WebSocket"]
-  , "homepage": "http://socketo.me"
-  , "license": "MIT"
-  , "authors": [
+    "name": "cboden/ratchet",
+    "type": "library",
+    "description": "PHP WebSocket library",
+    "keywords": [
+        "WebSockets",
+        "Server",
+        "Ratchet",
+        "Sockets",
+        "WebSocket"
+    ],
+    "homepage": "http://socketo.me",
+    "license": "MIT",
+    "authors": [
         {
-            "name": "Chris Boden"
-          , "email": "cboden@gmail.com"
-          , "role": "Developer"
-        }
-      , {
-            "name": "Matt Bonneau"
-          , "role": "Developer"
+            "name": "Chris Boden",
+            "email": "cboden@gmail.com",
+            "role": "Developer"
+        },
+        {
+            "name": "Matt Bonneau",
+            "role": "Developer"
         }
-    ]
-  , "support": {
-        "issues": "https://github.com/ratchetphp/Ratchet/issues"
-      , "chat":    "https://gitter.im/reactphp/reactphp"
-    }
-  , "autoload": {
+    ],
+    "support": {
+        "issues": "https://github.com/ratchetphp/Ratchet/issues",
+        "chat": "https://gitter.im/reactphp/reactphp"
+    },
+    "autoload": {
         "psr-4": {
             "Ratchet\\": "src/Ratchet"
         }
-    }
-  , "require": {
-        "php": ">=5.4.2"
-      , "ratchet/rfc6455": "^0.4.0 | ^0.3.1"
-      , "react/socket": "^1.0 || ^0.8 || ^0.7 || ^0.6 || ^0.5"
-      , "react/event-loop": "^1.0 || ^0.5 || ^0.4"
-      , "guzzlehttp/psr7": "^1.7|^2.0"
-      , "symfony/http-foundation": "^2.6|^3.0|^4.0|^5.0|^6.0|^7.0"
-      , "symfony/routing": "^2.6|^3.0|^4.0|^5.0|^6.0|^7.0"
-    }
-  , "require-dev": {
+    },
+    "require": {
+        "php": ">=5.4.2",
+        "ratchet/rfc6455": "^0.4.0 | ^0.3.1",
+        "react/socket": "^1.0 || ^0.8 || ^0.7 || ^0.6 || ^0.5",
+        "react/event-loop": "^1.0 || ^0.5 || ^0.4",
+        "guzzlehttp/psr7": "^1.7|^2.0",
+        "symfony/http-foundation": "^2.6|^3.0|^4.0|^5.0|^6.0|^7.0",
+        "symfony/routing": "^2.6|^3.0|^4.0|^5.0|^6.0|^7.0"
+    },
+    "require-dev": {
         "phpunit/phpunit": "^9.6 || ^5.7 || ^4.8.36"
+    },
+    "scripts": {
+        "tests": "vendor/bin/phpunit"
     }
 }
diff --git a/src/Ratchet/Server/FlashPolicy.php b/src/Ratchet/Server/FlashPolicy.php
index 4a1b8bdf..d38ceea3 100644
--- a/src/Ratchet/Server/FlashPolicy.php
+++ b/src/Ratchet/Server/FlashPolicy.php
@@ -66,7 +66,7 @@ public function addAllowedAccess($domain, $ports = '*', $secure = false) {
            throw new \UnexpectedValueException('Invalid Port');
         }
 
-        $this->_access[]   = array($domain, $ports, (boolean)$secure);
+        $this->_access[]   = [$domain, $ports, (bool) $secure];
         $this->_cacheValid = false;
 
         return $this;
diff --git a/src/Ratchet/Wamp/ServerProtocol.php b/src/Ratchet/Wamp/ServerProtocol.php
index 2d6d799c..781a5964 100644
--- a/src/Ratchet/Wamp/ServerProtocol.php
+++ b/src/Ratchet/Wamp/ServerProtocol.php
@@ -72,7 +72,7 @@ public function getSubProtocols() {
      */
     public function onOpen(ConnectionInterface $conn) {
         $decor = new WampConnection($conn);
-        $this->connections->attach($conn, $decor);
+        $this->connections->offsetSet($conn, $decor);
 
         $this->_decorating->onOpen($decor);
     }
@@ -125,7 +125,7 @@ public function onMessage(ConnectionInterface $from, $msg) {
             case static::MSG_PUBLISH:
                 $exclude  = (array_key_exists(3, $json) ? $json[3] : null);
                 if (!is_array($exclude)) {
-                    if (true === (boolean)$exclude) {
+                    if (true === (bool)$exclude) {
                         $exclude = [$from->WAMP->sessionId];
                     } else {
                         $exclude = [];
@@ -147,7 +147,7 @@ public function onMessage(ConnectionInterface $from, $msg) {
      */
     public function onClose(ConnectionInterface $conn) {
         $decor = $this->connections[$conn];
-        $this->connections->detach($conn);
+        $this->connections->offsetUnset($conn);
 
         $this->_decorating->onClose($decor);
     }
diff --git a/src/Ratchet/Wamp/Topic.php b/src/Ratchet/Wamp/Topic.php
index 675b236e..a1a0580c 100644
--- a/src/Ratchet/Wamp/Topic.php
+++ b/src/Ratchet/Wamp/Topic.php
@@ -58,7 +58,7 @@ public function broadcast($msg, array $exclude = array(), array $eligible = arra
      * @return boolean
      */
     public function has(ConnectionInterface $conn) {
-        return $this->subscribers->contains($conn);
+        return $this->subscribers->offsetExists($conn);
     }
 
     /**
@@ -66,7 +66,7 @@ public function has(ConnectionInterface $conn) {
      * @return Topic
      */
     public function add(ConnectionInterface $conn) {
-        $this->subscribers->attach($conn);
+        $this->subscribers->offsetSet($conn);
 
         return $this;
     }
@@ -76,8 +76,8 @@ public function add(ConnectionInterface $conn) {
      * @return Topic
      */
     public function remove(ConnectionInterface $conn) {
-        if ($this->subscribers->contains($conn)) {
-            $this->subscribers->detach($conn);
+        if ($this->subscribers->offsetExists($conn)) {
+            $this->subscribers->offsetUnset($conn);
         }
 
         return $this;
diff --git a/src/Ratchet/Wamp/TopicManager.php b/src/Ratchet/Wamp/TopicManager.php
index dd06ada4..e2b2936c 100644
--- a/src/Ratchet/Wamp/TopicManager.php
+++ b/src/Ratchet/Wamp/TopicManager.php
@@ -39,12 +39,12 @@ public function onCall(ConnectionInterface $conn, $id, $topic, array $params) {
     public function onSubscribe(ConnectionInterface $conn, $topic) {
         $topicObj = $this->getTopic($topic);
 
-        if ($conn->WAMP->subscriptions->contains($topicObj)) {
+        if ($conn->WAMP->subscriptions->offsetExists($topicObj)) {
             return;
         }
 
         $this->topicLookup[$topic]->add($conn);
-        $conn->WAMP->subscriptions->attach($topicObj);
+        $conn->WAMP->subscriptions->offsetSet($topicObj);
         $this->app->onSubscribe($conn, $topicObj);
     }
 
@@ -54,7 +54,7 @@ public function onSubscribe(ConnectionInterface $conn, $topic) {
     public function onUnsubscribe(ConnectionInterface $conn, $topic) {
         $topicObj = $this->getTopic($topic);
 
-        if (!$conn->WAMP->subscriptions->contains($topicObj)) {
+        if (!$conn->WAMP->subscriptions->offsetExists($topicObj)) {
             return;
         }
 
@@ -112,8 +112,8 @@ protected function getTopic($topic) {
     }
 
     protected function cleanTopic(Topic $topic, ConnectionInterface $conn) {
-        if ($conn->WAMP->subscriptions->contains($topic)) {
-            $conn->WAMP->subscriptions->detach($topic);
+        if ($conn->WAMP->subscriptions->offsetExists($topic)) {
+            $conn->WAMP->subscriptions->offsetUnset($topic);
         }
 
         $this->topicLookup[$topic->getId()]->remove($conn);
diff --git a/src/Ratchet/WebSocket/WsServer.php b/src/Ratchet/WebSocket/WsServer.php
index 88c56348..67218fe8 100644
--- a/src/Ratchet/WebSocket/WsServer.php
+++ b/src/Ratchet/WebSocket/WsServer.php
@@ -150,7 +150,7 @@ function(FrameInterface $frame) use ($wsConn) {
             $this->ueFlowFactory
         );
 
-        $this->connections->attach($conn, new ConnContext($wsConn, $streamer));
+        $this->connections->offsetSet($conn, new ConnContext($wsConn, $streamer));
 
         return $this->delegate->onOpen($wsConn);
     }
@@ -170,9 +170,9 @@ public function onMessage(ConnectionInterface $from, $msg) {
      * {@inheritdoc}
      */
     public function onClose(ConnectionInterface $conn) {
-        if ($this->connections->contains($conn)) {
+        if ($this->connections->offsetExists($conn)) {
             $context = $this->connections[$conn];
-            $this->connections->detach($conn);
+            $this->connections->offsetUnset($conn);
 
             $this->delegate->onClose($context->connection);
         }
@@ -182,7 +182,7 @@ public function onClose(ConnectionInterface $conn) {
      * {@inheritdoc}
      */
     public function onError(ConnectionInterface $conn, \Exception $e) {
-        if ($this->connections->contains($conn)) {
+        if ($this->connections->offsetExists($conn)) {
             $this->delegate->onError($this->connections[$conn]->connection, $e);
         } else {
             $conn->close();
@@ -215,7 +215,7 @@ public function enableKeepAlive(LoopInterface $loop, $interval = 30) {
 
         $this->pongReceiver = function(FrameInterface $frame, $wsConn) use ($pingedConnections, &$lastPing) {
             if ($frame->getPayload() === $lastPing->getPayload()) {
-                $pingedConnections->detach($wsConn);
+                $pingedConnections->offsetUnset($wsConn);
             }
         };
 
@@ -231,7 +231,7 @@ public function enableKeepAlive(LoopInterface $loop, $interval = 30) {
                 $wsConn  = $this->connections[$conn]->connection;
 
                 $wsConn->send($lastPing);
-                $pingedConnections->attach($wsConn);
+                $pingedConnections->offsetSet($wsConn);
             }
         });
    }
diff --git a/tests/unit/AbstractConnectionDecoratorTest.php b/tests/unit/AbstractConnectionDecoratorTest.php
index 8c5b379c..2ecf10f1 100644
--- a/tests/unit/AbstractConnectionDecoratorTest.php
+++ b/tests/unit/AbstractConnectionDecoratorTest.php
@@ -90,9 +90,9 @@ public function testUnsetLevel2() {
     public function testGetConnection() {
         $class  = new \ReflectionClass('Ratchet\\AbstractConnectionDecorator');
         $method = $class->getMethod('getConnection');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $conn = $method->invokeArgs($this->l1, array());
+        $conn = $method->invokeArgs($this->l1, []);
 
         $this->assertSame($this->mock, $conn);
     }
@@ -100,9 +100,9 @@ public function testGetConnection() {
     public function testGetConnectionLevel2() {
         $class  = new \ReflectionClass('Ratchet\\AbstractConnectionDecorator');
         $method = $class->getMethod('getConnection');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $conn = $method->invokeArgs($this->l2, array());
+        $conn = $method->invokeArgs($this->l2, []);
 
         $this->assertSame($this->l1, $conn);
     }
diff --git a/tests/unit/AppTest.php b/tests/unit/AppTest.php
index b3c879e3..9a4fcbc8 100644
--- a/tests/unit/AppTest.php
+++ b/tests/unit/AppTest.php
@@ -23,7 +23,7 @@ public function testCtorWithoutArgumentsStartsListeningOnDefaultPorts() {
         $app = new App();
 
         $ref = new \ReflectionProperty($app, '_server');
-        $ref->setAccessible(true);
+        // $ref->setAccessible(true);
         $server = $ref->getValue($app);
         assert($server instanceof IoServer);
 
diff --git a/tests/unit/Wamp/ServerProtocolTest.php b/tests/unit/Wamp/ServerProtocolTest.php
index 4e4983fa..a8e9165a 100644
--- a/tests/unit/Wamp/ServerProtocolTest.php
+++ b/tests/unit/Wamp/ServerProtocolTest.php
@@ -79,7 +79,7 @@ public function testSubscribe() {
 
     public function testUnSubscribe() {
         $uri = 'http://example.com/endpoint';
-        $clientMessage = array(6, $uri);
+        $clientMessage = [6, $uri];
 
         $conn = $this->newConn();
 
@@ -190,9 +190,9 @@ public function testOnClosePropagation() {
 
         $class  = new \ReflectionClass('Ratchet\\Wamp\\WampConnection');
         $method = $class->getMethod('getConnection');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $check = $method->invokeArgs($this->_app->last['onClose'][0], array());
+        $check = $method->invokeArgs($this->_app->last['onClose'][0], []);
 
         $this->assertSame($conn, $check);
     }
@@ -207,9 +207,9 @@ public function testOnErrorPropagation() {
 
         $class  = new \ReflectionClass('Ratchet\\Wamp\\WampConnection');
         $method = $class->getMethod('getConnection');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $check = $method->invokeArgs($this->_app->last['onError'][0], array());
+        $check = $method->invokeArgs($this->_app->last['onError'][0], []);
 
         $this->assertSame($conn, $check);
         $this->assertSame($e, $this->_app->last['onError'][1]);
diff --git a/tests/unit/Wamp/TopicManagerTest.php b/tests/unit/Wamp/TopicManagerTest.php
index fd67fdd5..0036d705 100644
--- a/tests/unit/Wamp/TopicManagerTest.php
+++ b/tests/unit/Wamp/TopicManagerTest.php
@@ -34,9 +34,9 @@ public function setUpManager() {
     public function testGetTopicReturnsTopicObject() {
         $class  = new \ReflectionClass('Ratchet\Wamp\TopicManager');
         $method = $class->getMethod('getTopic');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $topic = $method->invokeArgs($this->mngr, array('The Topic'));
+        $topic = $method->invokeArgs($this->mngr, ['The Topic']);
 
         $this->assertInstanceOf('Ratchet\Wamp\Topic', $topic);
     }
@@ -46,9 +46,9 @@ public function testGetTopicCreatesTopicWithSameName() {
 
         $class  = new \ReflectionClass('Ratchet\Wamp\TopicManager');
         $method = $class->getMethod('getTopic');
-        $method->setAccessible(true);
+        //$method->setAccessible(true);
 
-        $topic = $method->invokeArgs($this->mngr, array($name));
+        $topic = $method->invokeArgs($this->mngr, [$name]);
 
         $this->assertEquals($name, $topic->getId());
     }
@@ -56,10 +56,10 @@ public function testGetTopicCreatesTopicWithSameName() {
     public function testGetTopicReturnsSameObject() {
         $class  = new \ReflectionClass('Ratchet\Wamp\TopicManager');
         $method = $class->getMethod('getTopic');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $topic = $method->invokeArgs($this->mngr, array('No copy'));
-        $again = $method->invokeArgs($this->mngr, array('No copy'));
+        $topic = $method->invokeArgs($this->mngr, ['No copy']);
+        $again = $method->invokeArgs($this->mngr, ['No copy']);
 
         $this->assertSame($topic, $again);
     }
@@ -95,13 +95,13 @@ public function testTopicIsInConnectionOnSubscribe() {
 
         $class  = new \ReflectionClass('Ratchet\Wamp\TopicManager');
         $method = $class->getMethod('getTopic');
-        $method->setAccessible(true);
+        // $method->setAccessible(true);
 
-        $topic = $method->invokeArgs($this->mngr, array($name));
+        $topic = $method->invokeArgs($this->mngr, [$name]);
 
         $this->mngr->onSubscribe($this->conn, $name);
 
-        $this->assertTrue($this->conn->WAMP->subscriptions->contains($topic));
+        $this->assertTrue($this->conn->WAMP->subscriptions->offsetExists($topic));
     }
 
     public function testDoubleSubscriptionFiresOnce() {
@@ -135,14 +135,14 @@ public function testUnsubscribeRemovesTopicFromConnection() {
 
         $class  = new \ReflectionClass('Ratchet\Wamp\TopicManager');
         $method = $class->getMethod('getTopic');
-        $method->setAccessible(true);
+        //$method->setAccessible(true);
 
         $topic = $method->invokeArgs($this->mngr, array($name));
 
         $this->mngr->onSubscribe($this->conn, $name);
         $this->mngr->onUnsubscribe($this->conn, $name);
 
-        $this->assertFalse($this->conn->WAMP->subscriptions->contains($topic));
+        $this->assertFalse($this->conn->WAMP->subscriptions->offsetExists($topic));
     }
 
     public function testOnPublishBubbles() {
@@ -167,10 +167,10 @@ public function testOnCloseBubbles() {
     protected function topicProvider($name) {
         $class  = new \ReflectionClass('Ratchet\Wamp\TopicManager');
         $method = $class->getMethod('getTopic');
-        $method->setAccessible(true);
+        //$method->setAccessible(true);
 
         $attribute = $class->getProperty('topicLookup');
-        $attribute->setAccessible(true);
+        //$attribute->setAccessible(true);
 
         $topic = $method->invokeArgs($this->mngr, array($name));