diff --git a/composer.json b/composer.json
index 805a632..922924a 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
         "php": "^8.3",
         "silverstripe/framework": "^6",
         "silverstripe/admin": "^3",
-        "asyncphp/doorman": "^4"
+        "asyncphp/doorman": "^4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^11.3",