diff --git a/.github/workflows/deploy-site.yaml b/.github/workflows/deploy-site.yaml
index dcc1e377..f3daeb7a 100644
--- a/.github/workflows/deploy-site.yaml
+++ b/.github/workflows/deploy-site.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # checkout to the commit that has been pushed
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2.6.0
diff --git a/.github/workflows/html-proof.yaml b/.github/workflows/html-proof.yaml
index 84dd0fe1..03de1dea 100644
--- a/.github/workflows/html-proof.yaml
+++ b/.github/workflows/html-proof.yaml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     # checkout to the commit that has been pushed
-    - uses: actions/checkout@v3.0.2
+    - uses: actions/checkout@v4
       with:
         submodules: true  # Fetch Hugo themes (true OR recursive)
         fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
diff --git a/.github/workflows/md-link-check.yaml b/.github/workflows/md-link-check.yaml
index 1828feed..5e9546a4 100644
--- a/.github/workflows/md-link-check.yaml
+++ b/.github/workflows/md-link-check.yaml
@@ -8,6 +8,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     # checkout to latest commit
-    - uses: actions/checkout@v3.0.2
+    - uses: actions/checkout@v4
     # run markdown linter
     - uses: gaurav-nelson/github-action-markdown-link-check@1.0.14
diff --git a/.github/workflows/percy.yml b/.github/workflows/percy.yml
index 33b4597e..9bf7d2f1 100644
--- a/.github/workflows/percy.yml
+++ b/.github/workflows/percy.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.0.2
+        uses: actions/checkout@v4
         with:
           submodules: true  # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
diff --git a/.github/workflows/theme-update.yml b/.github/workflows/theme-update.yml
index e9e8b449..8d7e479e 100644
--- a/.github/workflows/theme-update.yml
+++ b/.github/workflows/theme-update.yml
@@ -8,7 +8,7 @@ jobs:
   update-theme:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.1
+      - uses: actions/checkout@v4
         with:
           ref: main