diff --git a/.github/workflows/post-process.yml b/.github/workflows/post-process.yml
index f1db4ce5..720c99ff 100644
--- a/.github/workflows/post-process.yml
+++ b/.github/workflows/post-process.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       max-parallel: 1
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Python
@@ -45,7 +45,7 @@ jobs:
           - macos-14
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index cf17ea33..da73cee3 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,7 +39,7 @@ jobs:
       id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/testing.yaml b/.github/workflows/testing.yaml
index b1435902..1a7f1bd2 100644
--- a/.github/workflows/testing.yaml
+++ b/.github/workflows/testing.yaml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       max-parallel: 1
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Python
@@ -50,7 +50,7 @@ jobs:
             python-version: "3.12"
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
@@ -71,7 +71,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/upgrade_dependencies.yml b/.github/workflows/upgrade_dependencies.yml
index ef54cf12..628e1895 100644
--- a/.github/workflows/upgrade_dependencies.yml
+++ b/.github/workflows/upgrade_dependencies.yml
@@ -18,7 +18,7 @@ jobs:
         package: ["."]
         python-version: ["3.10", "3.11", "3.12"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v6
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: upgrade
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: detect auto-upgrade-dependency branches