diff --git a/composer.json b/composer.json
index 31d7311d..38adbd66 100644
--- a/composer.json
+++ b/composer.json
@@ -25,5 +25,7 @@
         ]
     },
     "minimum-stability": "dev",
-    "version": "5.1.x-dev"
+    "extra": {
+        "branch-version": "5.1-dev"
+    }
 }