diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9bb48f6..7a8af73 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -88,7 +88,7 @@ jobs:
         if: github.ref == 'refs/heads/main'
         uses: peaceiris/actions-mdbook@v1.1.13
         with:
-          mdbook-version: '0.3.7'
+          mdbook-version: '0.4.5'
 
       - name: Build site
         if: github.ref == 'refs/heads/main'
diff --git a/README.md b/README.md
index c94f537..e9029b7 100644
--- a/README.md
+++ b/README.md
@@ -931,7 +931,7 @@ jobs:
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
         with:
-          mdbook-version: '0.3.7'
+          mdbook-version: '0.4.5'
           # mdbook-version: 'latest'
 
       - run: mdbook build