diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index ba026fea..0810ce2a 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -58,4 +58,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v3
+        uses: actions/deploy-pages@v4