diff --git a/.github/workflows/autograding.yml b/.github/workflows/autograding.yml
index 0cd0c8981..74590702d 100644
--- a/.github/workflows/autograding.yml
+++ b/.github/workflows/autograding.yml
@@ -10,7 +10,7 @@ jobs:
   Build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Set up JDK 11
         uses: actions/setup-java@v2
         with:
diff --git a/.github/workflows/check-md-links.yml b/.github/workflows/check-md-links.yml
index 811cd98a0..f6beaee8c 100644
--- a/.github/workflows/check-md-links.yml
+++ b/.github/workflows/check-md-links.yml
@@ -6,7 +6,7 @@ jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: gaurav-nelson/github-action-markdown-link-check@1.0.13
         with:
           check-modified-files-only: 'yes'
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c4c4a3821..136037649 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
     name: on ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v2.3.5
+    - uses: actions/checkout@v2.4.0
     - name: Set up JDK 11
       uses: actions/setup-java@v2
       with:
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index ba8498594..0a6e1e051 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -13,7 +13,7 @@ jobs:
     name: Coverage on Ubuntu
 
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Set up JDK 11
         uses: actions/setup-java@v2
         with:
diff --git a/.github/workflows/sync-labels.yml b/.github/workflows/sync-labels.yml
index 4b66b5f10..73d768133 100644
--- a/.github/workflows/sync-labels.yml
+++ b/.github/workflows/sync-labels.yml
@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: micnncim/action-label-syncer@v1.3.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}