diff --git a/.github/workflows/publication-integrity.yml b/.github/workflows/publication-integrity.yml
index 60a9746..5780b75 100644
--- a/.github/workflows/publication-integrity.yml
+++ b/.github/workflows/publication-integrity.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/stamp-publications.yml b/.github/workflows/stamp-publications.yml
index 155aac3..b2b7d48 100644
--- a/.github/workflows/stamp-publications.yml
+++ b/.github/workflows/stamp-publications.yml
@@ -20,7 +20,7 @@ jobs:
     if: github.actor != 'github-actions[bot]'
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/upgrade-timestamps.yml b/.github/workflows/upgrade-timestamps.yml
index 062a0db..c9a8dd0 100644
--- a/.github/workflows/upgrade-timestamps.yml
+++ b/.github/workflows/upgrade-timestamps.yml
@@ -14,7 +14,7 @@ jobs:
     if: github.actor != 'github-actions[bot]'
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0