diff --git a/composer.json b/composer.json
index 19c3bcadd6b..49daa7d1e6d 100644
--- a/composer.json
+++ b/composer.json
@@ -133,7 +133,8 @@
     "symfony/symfony": "*",
     "doctrine/doctrine-migrations-bundle": "3.1.0",
     "sabre/dav": "4.2.2",
-    "thecodingmachine/safe": "<2.0"
+    "thecodingmachine/safe": "<2.0",
+    "pimcore/admin-ui-classic-bundle": "<1.2"
   },
   "require-dev": {
     "codeception/codeception": "^5.0.3",