diff --git a/composer.json b/composer.json
index a5cd592..ce3e85b 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
         "php": "^8.1",
         "composer-plugin-api": "^2.0",
         "codefog/contao-haste": "^5.2",
-        "contao/core-bundle": "^4.13.50 || ^5.3.14 || ^5.4.4",
+        "contao/core-bundle": "^4.13.50 || ~5.3.14 || ^5.4.4",
         "doctrine/dbal": "^3.4",
         "doctrine/orm": "^2.19",
         "knplabs/knp-menu": "^3.1",
diff --git a/src/ContaoManager/Plugin.php b/src/ContaoManager/Plugin.php
index 64257a6..4fbfb10 100644
--- a/src/ContaoManager/Plugin.php
+++ b/src/ContaoManager/Plugin.php
@@ -11,6 +11,7 @@
 use Contao\ManagerPlugin\Routing\RoutingPluginInterface;
 use Symfony\Component\Config\Loader\LoaderResolverInterface;
 use Symfony\Component\HttpKernel\KernelInterface;
+use Terminal42\NotificationCenterBundle\Controller\DownloadBulkyItemController;
 use Terminal42\NotificationCenterBundle\Terminal42NotificationCenterBundle;
 
 class Plugin implements BundlePluginInterface, RoutingPluginInterface
@@ -27,8 +28,8 @@ public function getBundles(ParserInterface $parser): array
     public function getRouteCollection(LoaderResolverInterface $resolver, KernelInterface $kernel)
     {
         return $resolver
-            ->resolve(__DIR__.'/../Controller/DownloadBulkyItemController.php', 'attribute')
-            ->load(__DIR__.'/../Controller/DownloadBulkyItemController.php')
+            ->resolve(DownloadBulkyItemController::class)
+            ->load(DownloadBulkyItemController::class)
         ;
     }
 }
diff --git a/src/Controller/DownloadBulkyItemController.php b/src/Controller/DownloadBulkyItemController.php
index d038ef0..06a9cb8 100644
--- a/src/Controller/DownloadBulkyItemController.php
+++ b/src/Controller/DownloadBulkyItemController.php
@@ -9,10 +9,12 @@
 use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpFoundation\UriSigner;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Routing\Annotation\Route;
 use Terminal42\NotificationCenterBundle\BulkyItem\BulkyItemStorage;
 
-#[Route('/notifications/download/{voucher}', 'nc_bulky_item_download', requirements: ['voucher' => BulkyItemStorage::VOUCHER_REGEX])]
+/**
+ * @Route("/notifications/download/{voucher}", name="nc_bulky_item_download", requirements={"voucher"=BulkyItemStorage::VOUCHER_REGEX})
+ */
 class DownloadBulkyItemController
 {
     public function __construct(