diff --git a/composer.json b/composer.json
index 4ac5810..fd12548 100644
--- a/composer.json
+++ b/composer.json
@@ -11,6 +11,7 @@
   "require": {
     "php": "^8.3",
     "contao/core-bundle": "^5.7",
+    "contao/calendar-bundle": "^5.7",
     "contao/manager-plugin": "^2.0",
     "numero2/contao-tags": "^0.5"
   },