diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index 04277a31..1a86209e 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -28,7 +28,7 @@ jobs:
       TOXENV: ${{ format('py{0}{1}-{2}', matrix.py-ver-major, matrix.py-ver-minor, matrix.step) }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -88,7 +88,7 @@ jobs:
       TOXENV: ${{ format('py312-{0}', matrix.step) }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -115,7 +115,7 @@ jobs:
     runs-on: ubuntu-24.04
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Singularity
         run: |
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 77078141..26b3c472 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.
diff --git a/.github/workflows/tag_to_publish.yml b/.github/workflows/tag_to_publish.yml
index 20b2ba64..499f8de2 100644
--- a/.github/workflows/tag_to_publish.yml
+++ b/.github/workflows/tag_to_publish.yml
@@ -16,7 +16,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Singularity
         run: |