diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aabfb2c0..6ef7468e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build image
         run: docker build -t crypto101 docker/
       - name: Generate documents