diff --git a/composer.json b/composer.json
index 30c85b6..4f6589e 100644
--- a/composer.json
+++ b/composer.json
@@ -18,8 +18,8 @@
         "source": "https://github.com/getkirby/starterkit"
     },
     "require": {
-        "php": ">=7.1.0",
-        "getkirby/cms": "^3.0"
+        "php": ">=7.3.0 <8.1.0",
+        "getkirby/cms": "^3.5"
     },
     "scripts": {
         "start": [