diff --git a/composer.json b/composer.json
index c2e67ea..34fd146 100755
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
 	],
 	"type": "silverstripe-module",
 	"require": {
-		"silverstripe/cms": ">=3.1.0",
+		"silverstripe/cms": "~3.1",
 		"silverstripe/lumberjack": "~1.1",
 		"silverstripe/tagfield": "~1.0.0"
 	},