diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index ccff966..48ba19a 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install Python
       uses: actions/setup-python@v4