diff --git a/composer.json b/composer.json
index d35d2fe..3340db1 100644
--- a/composer.json
+++ b/composer.json
@@ -12,19 +12,19 @@
     ],
     "require": {
         "php": ">=5.5.9",
-        "symfony/config": "~2.8|~3.0|~4.0",
-        "symfony/dependency-injection": "~2.8|~3.0|~4.0",
-        "symfony/framework-bundle": "~2.8|~3.0|~4.0",
-        "symfony/http-foundation": "~2.8|~3.0|~4.0",
-        "symfony/http-kernel": "~2.8|~3.0|~4.0",
-        "symfony/routing": "~2.8|~3.0|~4.0"
+        "symfony/config": "~4.0|~5.0",
+        "symfony/dependency-injection": "~4.0|~5.0",
+        "symfony/framework-bundle": "~4.0|~5.0",
+        "symfony/http-foundation": "~4.0|~5.0",
+        "symfony/http-kernel": "~4.0|~5.0",
+        "symfony/routing": "~4.0|~5.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",
-        "symfony/asset": "~2.8|~3.0|~4.0",
-        "symfony/browser-kit": "~2.8|~3.0|~4.0",
-        "symfony/filesystem": "~2.8|~3.0|~4.0",
-        "symfony/http-foundation": "~2.8|~3.0|~4.0"
+        "symfony/asset": "~4.0|~5.0",
+        "symfony/browser-kit": "~4.0|~5.0",
+        "symfony/filesystem": "~4.0|~5.0",
+        "symfony/http-foundation": "~4.0|~5.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 8c6a51d..e6df1c2 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -22,8 +22,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $treeBuilder->root('phpmentors_session_configuration');
+        $treeBuilder = new TreeBuilder('phpmentors_session_configuration');
+        $treeBuilder->getRootNode();
 
         return $treeBuilder;
     }
diff --git a/src/EventListener/SessionConfigurationListener.php b/src/EventListener/SessionConfigurationListener.php
index 3188168..45e3b6f 100644
--- a/src/EventListener/SessionConfigurationListener.php
+++ b/src/EventListener/SessionConfigurationListener.php
@@ -15,7 +15,7 @@
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
 use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
 use Symfony\Component\Routing\RouterInterface;
 
 class SessionConfigurationListener
@@ -41,9 +41,9 @@ public function __construct(RouterInterface $router, SessionStorageInterface $se
     }
 
     /**
-     * @param GetResponseEvent $event
+     * @param RequestEvent $event
      */
-    public function onKernelRequest(GetResponseEvent $event)
+    public function onKernelRequest(RequestEvent $event)
     {
         if ($this->sessionStorage === null) {
             return;