diff --git a/composer.json b/composer.json
index a8b92e0..47c4cf8 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/config/routes.php b/config/routes.php
new file mode 100644
index 0000000..7a5e805
--- /dev/null
+++ b/config/routes.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
+use Terminal42\NotificationCenterBundle\BulkyItem\BulkyItemStorage;
+use Terminal42\NotificationCenterBundle\Controller\DownloadBulkyItemController;
+
+return static function (RoutingConfigurator $routes): void {
+    $routes->add('nc_bulky_item_download', '/notifications/download/{voucher}')
+        ->controller(DownloadBulkyItemController::class)
+        ->requirements(['voucher' => BulkyItemStorage::VOUCHER_REGEX])
+    ;
+};
diff --git a/src/ContaoManager/Plugin.php b/src/ContaoManager/Plugin.php
index 64257a6..b05fc5e 100644
--- a/src/ContaoManager/Plugin.php
+++ b/src/ContaoManager/Plugin.php
@@ -27,8 +27,8 @@ 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(__DIR__.'/../../config/routes.php')
+            ->load(__DIR__.'/../../config/routes.php')
         ;
     }
 }
diff --git a/src/Controller/DownloadBulkyItemController.php b/src/Controller/DownloadBulkyItemController.php
index 8cf37ab..0a2e652 100644
--- a/src/Controller/DownloadBulkyItemController.php
+++ b/src/Controller/DownloadBulkyItemController.php
@@ -10,10 +10,8 @@
 use Symfony\Component\HttpFoundation\UriSigner as HttpFoundationUriSigner;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\UriSigner as HttpKernelUriSigner;
-use Symfony\Component\Routing\Attribute\Route;
 use Terminal42\NotificationCenterBundle\BulkyItem\BulkyItemStorage;
 
-#[Route('/notifications/download/{voucher}', 'nc_bulky_item_download', requirements: ['voucher' => BulkyItemStorage::VOUCHER_REGEX])]
 class DownloadBulkyItemController
 {
     public function __construct(