diff --git a/.github/workflows/pr.automerge.yml b/.github/workflows/pr.automerge.yml
index 33fee4a23..fb2f40f46 100644
--- a/.github/workflows/pr.automerge.yml
+++ b/.github/workflows/pr.automerge.yml
@@ -51,7 +51,7 @@ jobs:
           echo "diff: $(which diff)"
 
       - name: Download Master Site
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: site
           path: tmp/
diff --git a/.github/workflows/site.links.yml b/.github/workflows/site.links.yml
index 95198230a..2e1ce6b16 100644
--- a/.github/workflows/site.links.yml
+++ b/.github/workflows/site.links.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: site
 
diff --git a/.github/workflows/site.validate.yml b/.github/workflows/site.validate.yml
index 73fa5f6da..38648cc26 100644
--- a/.github/workflows/site.validate.yml
+++ b/.github/workflows/site.validate.yml
@@ -15,7 +15,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: site
 
diff --git a/.github/workflows/src.build.yml b/.github/workflows/src.build.yml
index 4214040f9..862398f43 100644
--- a/.github/workflows/src.build.yml
+++ b/.github/workflows/src.build.yml
@@ -49,7 +49,7 @@ jobs:
           fi
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Fetch all commit history.
           ref: ${{ steps.get-ref.outputs.ref }}
diff --git a/.github/workflows/src.deploy.yml b/.github/workflows/src.deploy.yml
index 2cce6cc9c..d35214d8a 100644
--- a/.github/workflows/src.deploy.yml
+++ b/.github/workflows/src.deploy.yml
@@ -38,7 +38,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Fetch all commit history.
 
diff --git a/.github/workflows/src.lint.yml b/.github/workflows/src.lint.yml
index 4655a6d49..6604e2b6c 100644
--- a/.github/workflows/src.lint.yml
+++ b/.github/workflows/src.lint.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Check out Git repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Node.js
         uses: actions/setup-node@v6
diff --git a/.github/workflows/src.test.yml b/.github/workflows/src.test.yml
index 40751c96b..54e4fcae8 100644
--- a/.github/workflows/src.test.yml
+++ b/.github/workflows/src.test.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Check out Git repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Node.js
         uses: actions/setup-node@v6