diff --git a/.github/workflows/blank.yml b/.github/workflows/blank.yml
index 74a1cfd..04668d4 100644
--- a/.github/workflows/blank.yml
+++ b/.github/workflows/blank.yml
@@ -1,4 +1,4 @@
-name: CI
+name: github pages
 
 on:
   push:
@@ -7,17 +7,17 @@ on:
 
 jobs:
   build-deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v2
-        
+
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1.1.4
+        uses: peaceiris/actions-mdbook@v1
         with:
           mdbook-version: 'latest'
-        
+
       - run: mdbook build
-      
+
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v2
         env: