diff --git a/upgrade.md b/UPGRADE.md
similarity index 100%
rename from upgrade.md
rename to UPGRADE.md
diff --git a/composer.json b/composer.json
index 4a48a7d..c72ddd3 100644
--- a/composer.json
+++ b/composer.json
@@ -54,7 +54,7 @@
     ],
     "extra": {
         "branch-alias": {
-            "dev-master": "2.x-dev"
+            "dev-master": "4.x-dev"
         }
     }
 }