diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 2d8fd20..3a09d75 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -59,8 +59,12 @@ public function getConfigTreeBuilder()
 
     private function buildConfigTree()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('braincrafted_bootstrap');
+        $treeBuilder = new TreeBuilder('braincrafted_bootstrap');
+        if (method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            $rootNode = $treeBuilder->root('braincrafted_bootstrap');
+        }
 
         $rootNode
             ->children()
diff --git a/Form/Extension/ButtonTypeExtension.php b/Form/Extension/ButtonTypeExtension.php
index 177608d..b935a31 100644
--- a/Form/Extension/ButtonTypeExtension.php
+++ b/Form/Extension/ButtonTypeExtension.php
@@ -48,4 +48,15 @@ public function getExtendedType()
         // map old class to new one using LegacyFormHelper
         return LegacyFormHelper::getType('button');
     }
-}
\ No newline at end of file
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function getExtendedTypes()
+    {
+        return array(
+            // map old class to new one using LegacyFormHelper
+            LegacyFormHelper::getType('button')
+        );
+    }
+}
diff --git a/Form/Extension/InputGroupButtonExtension.php b/Form/Extension/InputGroupButtonExtension.php
index 51a7c20..5aee63b 100644
--- a/Form/Extension/InputGroupButtonExtension.php
+++ b/Form/Extension/InputGroupButtonExtension.php
@@ -40,6 +40,17 @@ public function getExtendedType()
         return LegacyFormHelper::getType('text');
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function getExtendedTypes()
+    {
+        return array(
+            // map old class to new one using LegacyFormHelper
+            LegacyFormHelper::getType('text')
+        );
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/Form/Extension/StaticControlExtension.php b/Form/Extension/StaticControlExtension.php
index e82a3aa..c9dabb3 100644
--- a/Form/Extension/StaticControlExtension.php
+++ b/Form/Extension/StaticControlExtension.php
@@ -63,4 +63,15 @@ public function getExtendedType()
         // map old class to new one using LegacyFormHelper
         return LegacyFormHelper::getType('form');
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function getExtendedTypes()
+    {
+        return array(
+            // map old class to new one using LegacyFormHelper
+            LegacyFormHelper::getType('form')
+        );
+    }
 }
diff --git a/Form/Extension/TypeSetterExtension.php b/Form/Extension/TypeSetterExtension.php
index 26a24c7..e63d1c0 100644
--- a/Form/Extension/TypeSetterExtension.php
+++ b/Form/Extension/TypeSetterExtension.php
@@ -40,4 +40,15 @@ public function getExtendedType()
         // map old class to new one using LegacyFormHelper
         return LegacyFormHelper::getType('form');
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function getExtendedTypes()
+    {
+        return array(
+            // map old class to new one using LegacyFormHelper
+            LegacyFormHelper::getType('form')
+        );
+    }
 }