diff --git a/.github/workflows/ets-from-source.yml b/.github/workflows/ets-from-source.yml
index 841c610d..0cdee8f8 100644
--- a/.github/workflows/ets-from-source.yml
+++ b/.github/workflows/ets-from-source.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout the target commit
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up bootstrap Python (3.10)
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/publish-on-pypi.yml b/.github/workflows/publish-on-pypi.yml
index 754c680f..a21511cb 100644
--- a/.github/workflows/publish-on-pypi.yml
+++ b/.github/workflows/publish-on-pypi.yml
@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Check out the release commit
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/test-minimal-dependencies.yml b/.github/workflows/test-minimal-dependencies.yml
index 8dbc4d6d..302d1ab9 100644
--- a/.github/workflows/test-minimal-dependencies.yml
+++ b/.github/workflows/test-minimal-dependencies.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Get apptools source
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/test-with-edm.yml b/.github/workflows/test-with-edm.yml
index cae281db..b5a73935 100644
--- a/.github/workflows/test-with-edm.yml
+++ b/.github/workflows/test-with-edm.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout the target commit
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up bootstrap Python (3.10)
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/test-with-pip.yml b/.github/workflows/test-with-pip.yml
index 4d9b6208..02f4509b 100644
--- a/.github/workflows/test-with-pip.yml
+++ b/.github/workflows/test-with-pip.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Get apptools source
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with: