diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 886be1c3..60d40f1c 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -9,7 +9,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: peaceiris/actions-mdbook@v2
         with:
           mdbook-version: 'latest'