diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 93bb6c38..32887bbc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
   deploy-test:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Read .env
         id: mdbook-version
@@ -27,7 +27,7 @@ jobs:
   doc-test:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Read .env
         id: mdbook-version
@@ -45,7 +45,7 @@ jobs:
   markdown-lint:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Lint all files recursively
         uses: avto-dev/markdown-lint@v1
         with:
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 6c270969..a33dca7c 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Read .env
         id: mdbook-version
diff --git a/.github/workflows/url-check-on-change.yml b/.github/workflows/url-check-on-change.yml
index 95fadd34..3c902dde 100644
--- a/.github/workflows/url-check-on-change.yml
+++ b/.github/workflows/url-check-on-change.yml
@@ -9,7 +9,7 @@ jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: gaurav-nelson/github-action-markdown-link-check@v1
       with:
         use-verbose-mode: 'yes'
diff --git a/.github/workflows/url-check-periodic.yml b/.github/workflows/url-check-periodic.yml
index e5d7c075..00ca9e3b 100644
--- a/.github/workflows/url-check-periodic.yml
+++ b/.github/workflows/url-check-periodic.yml
@@ -9,7 +9,7 @@ jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: gaurav-nelson/github-action-markdown-link-check@v1
       with:
         use-verbose-mode: 'yes'