diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df66769..01b3518 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         python-version: ["3.11", "3.12"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
@@ -73,7 +73,7 @@ jobs:
       actions: read
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: github/codeql-action/init@v3
         with:
           languages: python
diff --git a/.github/workflows/container.yml b/.github/workflows/container.yml
index 2a2a36a..db3d42c 100644
--- a/.github/workflows/container.yml
+++ b/.github/workflows/container.yml
@@ -27,7 +27,7 @@ jobs:
     name: Build and smoke-test container
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Build image
         run: docker build --pull -t devcd:ci .
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 77650f3..6feb0f5 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -23,7 +23,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/publish-pypi.yml b/.github/workflows/publish-pypi.yml
index c87e65a..169fccb 100644
--- a/.github/workflows/publish-pypi.yml
+++ b/.github/workflows/publish-pypi.yml
@@ -21,7 +21,7 @@ jobs:
     name: Build, verify, and publish to PyPI
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           # On release events use the tag that triggered the release;
           # on manual dispatch use the explicitly provided ref.
diff --git a/.github/workflows/publish-test-pypi.yml b/.github/workflows/publish-test-pypi.yml
index 5e65dd8..019be16 100644
--- a/.github/workflows/publish-test-pypi.yml
+++ b/.github/workflows/publish-test-pypi.yml
@@ -17,7 +17,7 @@ jobs:
     name: Build, verify, and publish to TestPyPI
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: "${{ inputs.ref }}"
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index fff9182..cb82954 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,7 +13,7 @@ jobs:
     name: Create GitHub Release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0