diff --git a/composer.json b/composer.json
index 2095461..3c4c00b 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     ],
     "require":
     {
-        "silverstripe/framework": ">=3.1.x-dev",
-        "silverstripe/cms": ">=3.1.x-dev"
+        "silverstripe/framework": "~3.1",
+        "silverstripe/cms": "~3.1"
     }
 }