diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index ea976f66..483d087e 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -6,6 +6,9 @@
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 
+/**
+ * @internal
+ */
 class Configuration implements ConfigurationInterface
 {
     public function getConfigTreeBuilder(): TreeBuilder
diff --git a/src/DependencyInjection/StofDoctrineExtensionsExtension.php b/src/DependencyInjection/StofDoctrineExtensionsExtension.php
index 3cd28fbe..1f0fb1eb 100644
--- a/src/DependencyInjection/StofDoctrineExtensionsExtension.php
+++ b/src/DependencyInjection/StofDoctrineExtensionsExtension.php
@@ -5,12 +5,15 @@
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\Alias;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Config\Definition\Processor;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
+/**
+ * @internal
+ */
 class StofDoctrineExtensionsExtension extends Extension
 {
     private const LISTENER_EVENTS = array(