diff --git a/composer.json b/composer.json
index e3554cf..687f9df 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.4 || ^8.0",
-        "silverstripe/cms": "^4.0"
+        "silverstripe/cms": "4.13.x-dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
@@ -42,4 +42,4 @@
     },
     "minimum-stability": "dev",
     "prefer-stable": true
-}
+}
\ No newline at end of file