diff --git a/.github/workflows/wiby.yaml b/.github/workflows/wiby.yaml
index ae16cfa..e6dea29 100644
--- a/.github/workflows/wiby.yaml
+++ b/.github/workflows/wiby.yaml
@@ -71,7 +71,7 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           repository: ${{ github.event.repository.full_name }}
-          ref: ${{ github.event.pull_request.head.ref }}
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Prepare Node.js
         uses: actions/setup-node@v2
@@ -146,7 +146,7 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           repository: ${{ github.event.repository.full_name }}
-          ref: ${{ github.event.pull_request.head.ref }}
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Prepare Node.js
         uses: actions/setup-node@v2