diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e2bf3f7..a096bcf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
@@ -30,7 +30,7 @@ jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Set up Python 3.11
         uses: actions/setup-python@v5
         with:
@@ -65,7 +65,7 @@ jobs:
     needs: unittest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Set up Python 3.11
         uses: actions/setup-python@v5
         with:
@@ -91,7 +91,7 @@ jobs:
     needs: unittest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Set up Python 3.11
         uses: actions/setup-python@v5
         with: