diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index b246f729e..3ad1a8261 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -11,7 +11,7 @@ jobs:
       matrix:
         python-version: ["3.10"]  # save action minutes; not relevant: for open source unlimited minutes
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python ${{matrix.python-version}}
         uses: actions/setup-python@v2
         with:
@@ -36,7 +36,7 @@ jobs:
   #     matrix:
   #       python-version: ["3.8"]
   #   steps:
-  #     - uses: actions/checkout@v2
+  #     - uses: actions/checkout@v4
   #     - name: Check disk space
   #       run: df -h
   #     - name: Login to Docker Hub
diff --git a/.github/workflows/run_tests_os.yml b/.github/workflows/run_tests_os.yml
index 770a66025..efdb12780 100644
--- a/.github/workflows/run_tests_os.yml
+++ b/.github/workflows/run_tests_os.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2