diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..de4a392
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/vendor
+/composer.lock
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 461fe3b..b9f9853 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -17,8 +17,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('fkr_simple_pie');
+        $treeBuilder = new TreeBuilder('fkr_simple_pie');
+        $rootNode = \method_exists($treeBuilder, 'getRootNode') ? $treeBuilder->getRootNode() : $treeBuilder->root('fkr_simple_pie');
 
         $rootNode
             ->children()
diff --git a/README.md b/README.md
index 225e073..5530624 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 FkrSimplePieBundle
 ==================
 
-Integrates [SimplePie](https://github.com/simplepie/simplepie) RSS Parser into Symfony2 and setting up caching to the symfony2 cache folder.
+Integrates [SimplePie](https://github.com/simplepie/simplepie) RSS Parser into Symfony and setting up caching to the symfony cache folder.
 
 Installation
 ============
diff --git a/composer.json b/composer.json
index f732274..6f2529a 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
 	"name": "fkr/simplepie-bundle",
 	"type": "symfony-bundle",
-	"description": "Integrates SimplePie into Symfony2",
+	"description": "Integrates SimplePie into Symfony",
 	"keywords": ["SimplePie", "Symfony Bundle", "RSS", "ATOM", "Feed"],
 	"homepage": "https://github.com/fkrauthan/FkrSimplePieBundle",
 	"license": "MIT",
@@ -13,7 +13,7 @@
 	],
 	"require": {
 		"php": ">=5.3.2",
-		"symfony/framework-bundle": "~2.6|~3.0",
+		"symfony/framework-bundle": "~2.6|~3.0|~4.0|~5.0|~6.0",
 		"simplepie/simplepie": "~1.3"
 	},
 	"autoload": {