diff --git a/.github/workflows/autodoc.yml b/.github/workflows/autodoc.yml
index e771998..f5e1d4f 100644
--- a/.github/workflows/autodoc.yml
+++ b/.github/workflows/autodoc.yml
@@ -13,7 +13,7 @@ jobs:
     if: github.event.pull_request.merged == true
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Process markdown files
         run: |
           find . -name '*.md' | xargs perl tools/autodoc.pl
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6643487..fe4c788 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     name: Go ${{ matrix.go }} test
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Check documentation generator
         run: |
           find . -name '*.md' | xargs env AUTODOC_DRYRUN=1 perl tools/autodoc.pl
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 6ffe932..795cc5c 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -8,7 +8,7 @@ jobs:
       matrix:
         go: [1.19]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v3
         with:
           go-version: ${{ matrix.go }}