diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 827e897..6da3065 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ on:
       ref:
         description: 'Commit hash, branch name, or tag to run the CI pipeline for'
         required: false
-        default: 'HEAD'
+        default: 'master'
         type: string
 
 jobs: