diff --git a/.gitignore b/.gitignore
index 95f9096..85f75df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 composer.lock
 /vendor/
 phpunit.xml
+.idea
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 9a0b613..b6fd49a 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -17,13 +17,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        if (method_exists(TreeBuilder::class, 'getRootNode')) {
-            $treeBuilder = new TreeBuilder('opensoft_rollout');
-            $rootNode = $treeBuilder->getRootNode();
-        } else {
-            $treeBuilder = new TreeBuilder();
-            $rootNode = $treeBuilder->root('opensoft_rollout');
-        }
+        $treeBuilder = new TreeBuilder('opensoft_rollout');
+        $rootNode = $treeBuilder->getRootNode();
 
         // Here you should define the parameters that are allowed to
         // configure your bundle. See the documentation linked above for
diff --git a/Twig/Extension/RolloutExtension.php b/Twig/Extension/RolloutExtension.php
index 1d8cf56..9f01803 100644
--- a/Twig/Extension/RolloutExtension.php
+++ b/Twig/Extension/RolloutExtension.php
@@ -4,11 +4,13 @@
 
 use Opensoft\Rollout\RolloutUserInterface;
 use Opensoft\RolloutBundle\Rollout\GroupDefinitionAwareRollout;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
 
 /**
  * @author Richard Fullmer <richard.fullmer@opensoftdev.com>
  */
-class RolloutExtension extends \Twig_Extension
+class RolloutExtension extends AbstractExtension
 {
     /**
      * @var GroupDefinitionAwareRollout
@@ -31,7 +33,7 @@ public function __construct(GroupDefinitionAwareRollout $rollout)
     public function getFunctions()
     {
         return array(
-            new \Twig_SimpleFunction('rollout_is_active', function ($feature, RolloutUserInterface $user = null) {
+            new TwigFunction('rollout_is_active', function ($feature, RolloutUserInterface $user = null) {
                 return $this->rollout->isActive($feature, $user);
             })
         );
diff --git a/composer.json b/composer.json
index df0a31c..507d87e 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "opensoft/rollout-bundle",
-    "description": "A Symfony2/3/4 Bundle for opensoft/rollout",
+    "description": "A Symfony2/3/4/5/6 Bundle for opensoft/rollout",
     "license": "MIT",
     "authors": [
         {
@@ -9,8 +9,8 @@
         }
     ],
     "require": {
-        "php": ">=5.3",
-        "symfony/framework-bundle": "~2.1|^3.0|^4.0",
+        "php": ">=5.4",
+        "symfony/framework-bundle": "~2.1|^3.0|^4.0|^5.0|^6.0",
         "opensoft/rollout": "~2.1"
     },
     "require-dev": {