diff --git a/.github/workflows/test-formats.yml b/.github/workflows/test-formats.yml
index ec6d42e1..d5727f29 100644
--- a/.github/workflows/test-formats.yml
+++ b/.github/workflows/test-formats.yml
@@ -18,7 +18,7 @@ jobs:
         format: ["man", "text"]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with:
@@ -42,7 +42,7 @@ jobs:
         format: ["latex"]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 829ef27e..b6aa8c96 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with:
@@ -41,7 +41,7 @@ jobs:
     name: "pytest: py${{ matrix.python-version }}, sphinx${{ matrix.sphinx }}, on ${{ matrix.os }}"
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:
@@ -78,7 +78,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with:
@@ -133,7 +133,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout source
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with:
@@ -156,7 +156,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout source
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python 3.11
       uses: actions/setup-python@v6
       with: