diff --git a/composer.json b/composer.json
index fcdde70..8f0b7da 100644
--- a/composer.json
+++ b/composer.json
@@ -20,16 +20,16 @@
     },
     "require": {
         "php": ">=5.5.1",
-        "symfony/framework-bundle": "~2.7|~3.0|~4.0",
-        "symfony/dependency-injection": "~2.7|~3.0|~4.0",
-        "symfony/yaml": "~2.7|~3.0|~4.0",
+        "symfony/framework-bundle": "~2.7|~3.0|~4.0|~5.0",
+        "symfony/dependency-injection": "~2.7|~3.0|~4.0|~5.0",
+        "symfony/yaml": "~2.7|~3.0|~4.0|~5.0",
         "lightsaml/lightsaml": "~1.1"
     },
     "require-dev": {
-        "symfony/browser-kit": "~2.7|~3.0|~4.0",
-        "symfony/finder": "~2.7|~3.0|~4.0",
-        "symfony/filesystem": "~2.7|~3.0|~4.0",
-        "symfony/routing": "~2.7|~3.0|~4.0",
+        "symfony/browser-kit": "~2.7|~3.0|~4.0|~5.0",
+        "symfony/finder": "~2.7|~3.0|~4.0|~5.0",
+        "symfony/filesystem": "~2.7|~3.0|~4.0|~5.0",
+        "symfony/routing": "~2.7|~3.0|~4.0|~5.0",
         "phpunit/phpunit": "^5.7"
     },
     "config": {
diff --git a/src/LightSaml/SymfonyBridgeBundle/DependencyInjection/Configuration.php b/src/LightSaml/SymfonyBridgeBundle/DependencyInjection/Configuration.php
index a4cc7d6..28b62f2 100644
--- a/src/LightSaml/SymfonyBridgeBundle/DependencyInjection/Configuration.php
+++ b/src/LightSaml/SymfonyBridgeBundle/DependencyInjection/Configuration.php
@@ -23,8 +23,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $root = $treeBuilder->root('light_saml_symfony_bridge');
+        $treeBuilder = new TreeBuilder('light_saml_symfony_bridge');
+        $root = $treeBuilder->getRootNode();
 
         $root->children()
             ->arrayNode('own')