diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6596d17..0d5e3d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: deps
         run: |
@@ -44,7 +44,7 @@ jobs:
           compiler: { CC: "gcc", CXX: "g++" }
     runs-on: ${{ matrix.platform }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         submodules: 'true'
     - name: Install ICU (Ubuntu)
@@ -97,7 +97,7 @@ jobs:
           - "3.11"
     runs-on: ${{ matrix.platform }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python }}
@@ -134,7 +134,7 @@ jobs:
         build-shared: ["0", "1"]
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         submodules: 'true'
     - name: Enable ASan Sanitizers
@@ -179,7 +179,7 @@ jobs:
           - "3.11"
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 637719e..937e2af 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,7 +10,7 @@ jobs:
     name: upload release to PyPI
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - uses: actions/setup-python@v6
       with: