diff --git a/composer.json b/composer.json
index 393ec6fd..fae6c4e5 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,6 @@
     "description": "Installation and Upgrade Guide",
     "license": "OPL-1.0",
     "require": {
-      "typo3/cms-core": "^11.0"
+      "typo3/cms-core": "^10.4.9"
     }
 }