diff --git a/composer.json b/composer.json
index ac2df07..68c4f65 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
 	],
 	"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"
 	}
-}
\ No newline at end of file
+}