diff --git a/composer.json b/composer.json
index 6cd5c8fd..c0287b85 100644
--- a/composer.json
+++ b/composer.json
@@ -31,10 +31,6 @@
         "phpunit/phpunit": "^5.7"
     },
     "extra": {
-        "branch-alias": {
-            "4.x-dev": "4.2.x-dev",
-            "dev-master": "5.x-dev"
-        },
         "expose": [
             "javascript"
         ]
@@ -51,4 +47,4 @@
     },
     "minimum-stability": "dev",
     "prefer-stable": true
-}
+}
\ No newline at end of file