diff --git a/action.yml b/action.yml
index f02f682..5102e64 100644
--- a/action.yml
+++ b/action.yml
@@ -10,7 +10,7 @@ inputs:
   branch:
     description: Git branch name, where changes should be pushed too.
     required: false
-    default: ${GITHUB_REF:11}
+    default: null
   commit_options:
     description: Commit options (eg. --no-verify)
     required: false