diff --git a/.github/workflows/depup.yml b/.github/workflows/depup.yml
index 77b147e..398468c 100644
--- a/.github/workflows/depup.yml
+++ b/.github/workflows/depup.yml
@@ -10,7 +10,7 @@ jobs:
   reviewdog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haya14busa/action-depup@v1
         id: depup
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0760f6e..cedafde 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,7 +14,7 @@ jobs:
     if: github.event.action != 'labeled'
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Bump version on merging Pull Requests with specific labels.
       # (bump:major,bump:minor,bump:patch)
@@ -55,6 +55,6 @@ jobs:
     if: github.event.action == 'labeled'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Post bumpr status comment
         uses: haya14busa/action-bumpr@v1
diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index 89916e4..0505635 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -5,7 +5,7 @@ jobs:
     name: pyright
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -19,7 +19,7 @@ jobs:
     name: shellcheck
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -35,7 +35,7 @@ jobs:
     name: markdownlint
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -50,7 +50,7 @@ jobs:
     name: misspell
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -65,7 +65,7 @@ jobs:
     name: yamllint
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -79,7 +79,7 @@ jobs:
     name: pyflakes
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: pyflakes
         uses: reviewdog/action-pyflakes@v1
         with:
diff --git a/.github/workflows/suggestions.yml b/.github/workflows/suggestions.yml
index d72eaa3..c350e0e 100644
--- a/.github/workflows/suggestions.yml
+++ b/.github/workflows/suggestions.yml
@@ -8,7 +8,7 @@ jobs:
     name: Shell suggestions
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -31,7 +31,7 @@ jobs:
     name: markdownlint and prettier suggestions
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
@@ -50,7 +50,7 @@ jobs:
     name: Black formatter
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d6c0308..00f9e71 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:
     name: Run Tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false