diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index af18f13..96b69d9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,7 +44,7 @@ jobs:
   sdist_verify:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: '3.13'
diff --git a/.github/workflows/sub_package_update.yml b/.github/workflows/sub_package_update.yml
index 71bf5b9..60649ec 100644
--- a/.github/workflows/sub_package_update.yml
+++ b/.github/workflows/sub_package_update.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: true
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v6
         with: