diff --git a/composer.json b/composer.json
index 6116271a8..ec27b6f5c 100644
--- a/composer.json
+++ b/composer.json
@@ -23,16 +23,16 @@
         "php": "^8.1",
         "friendsofsymfony/rest-bundle": "^3.0",
         "jms/serializer-bundle": "^4.0|^5.0",
-        "symfony/framework-bundle": "^5.4|^6.4",
-        "symfony/asset": "^5.4|^6.4",
-        "symfony/dependency-injection": "^5.4|^6.4",
-        "symfony/routing": "^5.4|^6.4",
-        "symfony/security-bundle": "^5.4|^6.4",
-        "symfony/yaml": "^5.4|^6.4",
-        "symfony/form": "^5.4|^6.4",
-        "symfony/validator": "^5.4|^6.4",
-        "symfony/twig-bundle": "^5.4|^6.4",
-        "symfony/twig-bridge": "^5.4|^6.4",
+        "symfony/framework-bundle": "^6.4",
+        "symfony/asset": "^6.4",
+        "symfony/dependency-injection": "^6.4",
+        "symfony/routing": "^6.4",
+        "symfony/security-bundle": "^6.4",
+        "symfony/yaml": "^6.4",
+        "symfony/form": "^6.4",
+        "symfony/validator": "^6.4",
+        "symfony/twig-bundle": "^6.4",
+        "symfony/twig-bridge": "^6.4",
         "twig/twig": "^3.0",
         "phpoption/phpoption": "^1.1",
         "doctrine/annotations": "^1.0",
diff --git a/src/Controller/ThreadController.php b/src/Controller/ThreadController.php
index 45bc82fbf..d8c5f6242 100644
--- a/src/Controller/ThreadController.php
+++ b/src/Controller/ThreadController.php
@@ -346,7 +346,7 @@ public function getThreadCommentsAction(Request $request, string $id): Response
             $thread->setPermalink($permalink);
 
             // Validate the entity
-            $errors = $this->get('validator')->validate($thread, null, ['NewThread']);
+            $errors = $this->container->get('core.validator')->validate($thread, null, ['NewThread']);
             if (count($errors) > 0) {
                 $view = View::create()
                     ->setStatusCode(Response::HTTP_BAD_REQUEST)
@@ -410,7 +410,7 @@ public function getThreadCommentsAction(Request $request, string $id): Response
                 return new Response($handler->renderTemplate($view, 'rss'), Response::HTTP_OK, $view->getHeaders());
             };
 
-            $this->get('fos_rest.view_handler')->registerHandler('rss', $templatingHandler);
+            $this->container->get('fos_rest.view_handler')->registerHandler('rss', $templatingHandler);
         }
 
         return $this->handleView($view);
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index ce7a7cc2a..d0fc0f462 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -28,7 +28,7 @@ class Configuration implements ConfigurationInterface
      *
      * @return NodeInterface
      */
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('fos_comment');