diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
index 9aaaa80..d0e17d8 100644
--- a/.github/workflows/changelog.yml
+++ b/.github/workflows/changelog.yml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
 
       - name: Generate CHANGELOG
         uses: tj-actions/github-changelog-generator@v1.8
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 3ea4c42..d4093b7 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 91080db..902632f 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -13,7 +13,7 @@ jobs:
         python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
 
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2.2.2
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e26681e..dc6b479 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Create Release
         uses: softprops/action-gh-release@v1
         env:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2eb3f4e..163fb61 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
         python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, 'pypy-2.7', 'pypy-3.6', 'pypy-3.7']
 
     steps:
-    - uses: actions/checkout@v2.3.5
+    - uses: actions/checkout@v2.4.0
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2.2.2
       with:
diff --git a/.github/workflows/update-readme.yml b/.github/workflows/update-readme.yml
index f4b2c2e..376a6e0 100644
--- a/.github/workflows/update-readme.yml
+++ b/.github/workflows/update-readme.yml
@@ -9,7 +9,7 @@ jobs:
   sync-readme:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
         with:
           fetch-depth: 0