diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index fd6f1413..240d1162 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -14,7 +14,7 @@ jobs:
   deploy-book:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     # Install dependencies
     - name: Setup Miniconda