diff --git a/.github/workflows/black.yaml b/.github/workflows/black.yaml
index 5a30bdb..d9fa028 100644
--- a/.github/workflows/black.yaml
+++ b/.github/workflows/black.yaml
@@ -10,6 +10,6 @@ jobs:
   black:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: python3 -m pip install --user black==24.4.2
       - run: python3 -m black . --check
diff --git a/.github/workflows/mypy.yaml b/.github/workflows/mypy.yaml
index e2eaa5d..b1c640f 100644
--- a/.github/workflows/mypy.yaml
+++ b/.github/workflows/mypy.yaml
@@ -10,6 +10,6 @@ jobs:
   black:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: python3 -m pip install --user mypy==1.10.0
       - run: python3 -m mypy .
diff --git a/.github/workflows/unittest.yaml b/.github/workflows/unittest.yaml
index f62f18e..f2ec0c5 100644
--- a/.github/workflows/unittest.yaml
+++ b/.github/workflows/unittest.yaml
@@ -10,5 +10,5 @@ jobs:
   unittest:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: python3 -m unittest