diff --git a/.github/workflows/black.yaml b/.github/workflows/black.yaml
index 81e6a94..1dcb706 100644
--- a/.github/workflows/black.yaml
+++ b/.github/workflows/black.yaml
@@ -6,5 +6,5 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: psf/black@stable
diff --git a/.github/workflows/bot.yaml b/.github/workflows/bot.yaml
index 6182d0c..d708763 100644
--- a/.github/workflows/bot.yaml
+++ b/.github/workflows/bot.yaml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     
diff --git a/.github/workflows/codemeta2cff.yml b/.github/workflows/codemeta2cff.yml
index 62d9668..fd44d9c 100644
--- a/.github/workflows/codemeta2cff.yml
+++ b/.github/workflows/codemeta2cff.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Convert CFF
         uses: caltechlibrary/codemeta2cff@main
       - name: Install jq for JSON parsing
diff --git a/.github/workflows/iga.yaml b/.github/workflows/iga.yaml
index f70bddb..565d4c0 100644
--- a/.github/workflows/iga.yaml
+++ b/.github/workflows/iga.yaml
@@ -79,7 +79,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.ref }}
       - name: Install sde
@@ -96,7 +96,7 @@ jobs:
     needs: add_doi_codemeta
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.ref }}
       - name: Convert CFF
diff --git a/.github/workflows/pypi-publish.yaml b/.github/workflows/pypi-publish.yaml
index 2460d6c..d442d67 100644
--- a/.github/workflows/pypi-publish.yaml
+++ b/.github/workflows/pypi-publish.yaml
@@ -9,7 +9,7 @@ jobs:
   build-n-publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Set up Python 3.9
         uses: actions/setup-python@v6
         with: