diff --git a/composer.json b/composer.json
index 701b53a..e0e46c0 100644
--- a/composer.json
+++ b/composer.json
@@ -27,5 +27,9 @@
     "suggest": {
         "silverstripe/queuedjobs": "Automatically schedules content review emails to be sent, only requiring one crontask to be created"
     },
-    "extra": []
+    "extra": {
+        "branch-alias": {
+            "dev-master": "4.0.x-dev"
+        }
+    }
 }