diff --git a/composer.json b/composer.json
index 3b8921c..a219347 100644
--- a/composer.json
+++ b/composer.json
@@ -17,24 +17,24 @@
     "require": {
         "php": ">=5.3.9",
         "doctrine/annotations": "~1.0",
-        "symfony/config": "~2.8|~3.0|~4.0",
-        "symfony/dependency-injection": "~2.8|~3.0|~4.0",
-        "symfony/http-kernel": "~2.8|~3.0|~4.0",
-        "symfony/validator": "~2.8|~3.0|~4.0"
+        "symfony/config": "~4.0|~5.0",
+        "symfony/dependency-injection": "~4.0|~5.0",
+        "symfony/http-kernel": "~4.0|~5.0",
+        "symfony/validator": "~4.0|~5.0"
     },
     "require-dev": {
         "phpmentors/domain-kata": "~1.3",
         "phpmentors/pageflower-bundle": "~1.3",
         "phpunit/phpunit": "~4.0",
-        "symfony/browser-kit": "~2.8|~3.0|~4.0",
-        "symfony/css-selector": "~2.8|~3.0|~4.0",
-        "symfony/filesystem": "~2.8|~3.0|~4.0",
-        "symfony/form": "~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/monolog-bundle": "~2.8|~3.0|~4.0",
-        "symfony/templating": "~2.8|~3.0|~4.0",
-        "symfony/twig-bundle": "~2.8|~3.0|~4.0"
+        "symfony/browser-kit": "~4.0|~5.0",
+        "symfony/css-selector": "~4.0|~5.0",
+        "symfony/filesystem": "~4.0|~5.0",
+        "symfony/form": "~4.0|~5.0",
+        "symfony/framework-bundle": "~4.0|~5.0",
+        "symfony/http-foundation": "~4.0|~5.0",
+        "symfony/monolog-bundle": "~4.0|~5.0",
+        "symfony/templating": "~4.0|~5.0",
+        "symfony/twig-bundle": "~4.0|~5.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/DependencyInjection/Compiler/ReplaceFileLoadersPass.php b/src/DependencyInjection/Compiler/ReplaceFileLoadersPass.php
index a4760b0..5f9fadd 100644
--- a/src/DependencyInjection/Compiler/ReplaceFileLoadersPass.php
+++ b/src/DependencyInjection/Compiler/ReplaceFileLoadersPass.php
@@ -54,7 +54,7 @@ public function process(ContainerBuilder $container)
                 case 'addYamlMappings':
                     $metadataFactoryFactoryDefinition->addMethodCall($method, $arguments);
                     break;
-                case 'enableAnnotationMapping':
+                case 'setDoctrineAnnotationReader':
                     $metadataFactoryFactoryDefinition->addMethodCall('setAnnotationReader', array(clone $arguments[0]));
                     break;
                 case 'setMetadataCache':
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index d721353..07de0e8 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -30,8 +30,8 @@ class Configuration implements ConfigurationInterface
     public function getConfigTreeBuilder()
     {
         $defaultConstraintNamespaces = self::$defaultConstraintNamespaces;
-        $treeBuilder = new TreeBuilder();
-        $treeBuilder->root('phpmentors_validator')
+        $treeBuilder = new TreeBuilder('phpmentors_validator');
+        $treeBuilder->getRootNode()
             ->children()
                 ->arrayNode('constraint')
                     ->addDefaultsIfNotSet()