diff --git a/composer.json b/composer.json
index 4101c2e..e005d9a 100644
--- a/composer.json
+++ b/composer.json
@@ -29,9 +29,5 @@
         ]
     },
     "minimum-stability": "dev",
-    "extra": {
-        "branch-alias": {
-            "dev-master": "5.1-dev"
-        }
-    }
+    "version": "5.1-dev"
 }