diff --git a/composer.json b/composer.json
index fd31a97..2d12076 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "neos-package",
     "require": {
         "ext-pdo": "*",
-        "neos/flow": "^5.3.0 || ^6.3.5",
+        "neos/flow": "^6.3.5",
         "php": ">=7.4"
     },
     "require-dev": {