diff --git a/.github/workflows/docs-to-gh-pages.yml b/.github/workflows/docs-to-gh-pages.yml
index f3a4c73a..fd9bc891 100644
--- a/.github/workflows/docs-to-gh-pages.yml
+++ b/.github/workflows/docs-to-gh-pages.yml
@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
diff --git a/.github/workflows/fresh-to-vercel-pr-deployment.yml b/.github/workflows/fresh-to-vercel-pr-deployment.yml
index 45db0aaa..90c5d522 100644
--- a/.github/workflows/fresh-to-vercel-pr-deployment.yml
+++ b/.github/workflows/fresh-to-vercel-pr-deployment.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Download hugo build
         uses: actions/github-script@v6.4.1
diff --git a/.github/workflows/fresh-to-vercel-pr.yml b/.github/workflows/fresh-to-vercel-pr.yml
index a2ec8aa7..e54e60be 100644
--- a/.github/workflows/fresh-to-vercel-pr.yml
+++ b/.github/workflows/fresh-to-vercel-pr.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
diff --git a/.github/workflows/fresh-to-vercel.yml b/.github/workflows/fresh-to-vercel.yml
index c2ecfba9..8a849683 100644
--- a/.github/workflows/fresh-to-vercel.yml
+++ b/.github/workflows/fresh-to-vercel.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
diff --git a/.github/workflows/htmltest.yml b/.github/workflows/htmltest.yml
index 0893046f..398d9d17 100644
--- a/.github/workflows/htmltest.yml
+++ b/.github/workflows/htmltest.yml
@@ -17,7 +17,7 @@ jobs:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps:
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod