diff --git a/composer.json b/composer.json
index 3508d5d..69d3bbe 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "require": {
         "ext-json": "*",
         "php": "^7.4 || ^8.0",
-        "neos/flow": "^6.3 || ^7.0 || ^8.0 || @dev",
+        "neos/flow": "^6.3 || ^7.0 || ^8.0 || ^9.0 || @dev",
         "sentry/sdk": "^3.0",
         "jenssegers/agent": "^2.6"
     },