diff --git a/README.md b/README.md
index 1dc737c..38fb6b6 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ jobs:
   build-deploy:
     runs-on: ubuntu-18.04
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Setup mdBook
       uses: peaceiris/actions-mdbook@v1