diff --git a/.github/workflows/python-unittest.yml b/.github/workflows/python-unittest.yml
index 269c30c..0f1315a 100644
--- a/.github/workflows/python-unittest.yml
+++ b/.github/workflows/python-unittest.yml
@@ -9,7 +9,7 @@ jobs:
   python-unittests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
 
     - name: Install Poetry
       uses: snok/install-poetry@v1
diff --git a/.github/workflows/weekly_csv_release.yml b/.github/workflows/weekly_csv_release.yml
index 36e52ec..364b8e3 100644
--- a/.github/workflows/weekly_csv_release.yml
+++ b/.github/workflows/weekly_csv_release.yml
@@ -10,7 +10,7 @@ jobs:
   generate_and_release_csv:
       runs-on: ubuntu-latest
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
 
         - name: Install Poetry
           uses: snok/install-poetry@v1