diff --git a/composer.json b/composer.json
index e5b3849..7e00093 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
         }
     },
     "require": {
-        "statamic/cms": "~3.1.0 || ~3.2.0 || ^3.3"
+        "statamic/cms": "~3.1.0 || ~3.2.0 || ^3.3 || ^4.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2",