diff --git a/.github/workflows/upy.yml b/.github/workflows/upy.yml
index 74102bbe..f87554ab 100644
--- a/.github/workflows/upy.yml
+++ b/.github/workflows/upy.yml
@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Checkout Repository master branch
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
@@ -20,6 +20,12 @@ jobs:
       - name: Build static files
         run: hugo --minify --environment production
 
+      - name: Check build output
+        run: ls -R public
+
+      - name: List workspace contents
+        run: ls -la /github/workspace
+
       - name: Deploy
         uses: her-cat/upyun-deployer@v1.0.3
         with: