diff --git a/composer.json b/composer.json
index f004cc2..b145680 100644
--- a/composer.json
+++ b/composer.json
@@ -29,10 +29,5 @@
             "CommonMarkTest": "test/",
             "CommonMarkTestWeak": "test/"
         }
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-1.8.x-beta": "1.8.x-dev"
-        }
     }
 }