diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 5e0702d..00f7bcf 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1