diff --git a/composer.json b/composer.json
index 45eca2c..cbf61e9 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
   "require": {
     "guzzlehttp/psr7": "^2.0",
     "php": "^8.1",
-    "neos/neos": "^8.3"
+    "neos/neos": "^8.3|^9.0"
   },
   "require-dev": {
     "phpstan/phpstan": "^2.1",