diff --git a/composer.json b/composer.json
index d1eedbb..343819d 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     ],
     "require": {
         "php": ">=7.4.0",
-        "neos/flow": "^6.3.5 || ^7.0 || ^8.0"
+        "neos/flow": "^6.3.5 || ^7.0 || ^8.0 || ^9.0"
     },
     "require-dev": {
         "mikey179/vfsstream": "^1.6.1",