diff --git a/.github/workflows/ci-workflow.yml b/.github/workflows/ci-workflow.yml
index 01ddab0c..8a8803bf 100644
--- a/.github/workflows/ci-workflow.yml
+++ b/.github/workflows/ci-workflow.yml
@@ -14,7 +14,7 @@ jobs:
   housekeeping:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python
       uses: actions/setup-python@v4
@@ -55,7 +55,7 @@ jobs:
       matrix:
         python-version: [3.7, 3.8, 3.9, 3.10.6, 3.11.2]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/issue-commenter.yml b/.github/workflows/issue-commenter.yml
index 7bddcd07..dfd6c59c 100644
--- a/.github/workflows/issue-commenter.yml
+++ b/.github/workflows/issue-commenter.yml
@@ -9,7 +9,7 @@ jobs:
     name: Comments for every NEW issue.
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Read issue-comment.md
         id: issue-comment
diff --git a/.github/workflows/test-runner.yml b/.github/workflows/test-runner.yml
index ecfc2a10..b3668593 100644
--- a/.github/workflows/test-runner.yml
+++ b/.github/workflows/test-runner.yml
@@ -10,6 +10,6 @@ jobs:
   test-runner:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run test-runner
         run: docker-compose run test-runner