diff --git a/composer.json b/composer.json
index 1cf7da4..854530a 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
     "require": {
         "league/iso3166": "^4.0",
         "giggsey/locale": "^2.0",
-        "statamic/cms": "^3.0"
+        "statamic/cms": "^3.0|^4.0"
     },
     "extra": {
         "statamic": {