diff --git a/composer.json b/composer.json
index 7f70c67..e779515 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
 		"email": "sam@silverstripe.com"
 	}],
 	"require": {
-		"silverstripe/framework": ">=3.1",
-		"silverstripe/cms": ">=3.1"
+		"silverstripe/framework": ">=3.1.x-dev,<4.0",
+		"silverstripe/cms": ">=3.1.x-dev,<4.0"
 	}
 }