diff --git a/.github/workflows/python-unittest.yml b/.github/workflows/python-unittest.yml
index 269c30c..a04411c 100644
--- a/.github/workflows/python-unittest.yml
+++ b/.github/workflows/python-unittest.yml
@@ -9,17 +9,17 @@ jobs:
   python-unittests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
 
     - name: Install Poetry
-      uses: snok/install-poetry@v1
+      uses: snok/install-poetry@93ada01c735cc8a383ce0ce2ae205a21c415379b # v1
       with:
         version: 1.5.1
         virtualenvs-create: true
         virtualenvs-in-project: true
 
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4
       with:
         python-version: "3.9"
         cache: "poetry"
diff --git a/.github/workflows/weekly_csv_release.yml b/.github/workflows/weekly_csv_release.yml
index 8f0fa38..f98475f 100644
--- a/.github/workflows/weekly_csv_release.yml
+++ b/.github/workflows/weekly_csv_release.yml
@@ -10,17 +10,17 @@ jobs:
   generate_and_release_csv:
       runs-on: ubuntu-latest
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
 
         - name: Install Poetry
-          uses: snok/install-poetry@v1
+          uses: snok/install-poetry@93ada01c735cc8a383ce0ce2ae205a21c415379b # v1
           with:
             version: 1.5.1
             virtualenvs-create: true
             virtualenvs-in-project: true
 
         - name: Set up Python
-          uses: actions/setup-python@v4
+          uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4
           with:
             python-version: "3.9"
             cache: "poetry"
@@ -36,7 +36,7 @@ jobs:
 
         - name: Slack Notification
           if: failure()
-          uses: rtCamp/action-slack-notify@v2
+          uses: rtCamp/action-slack-notify@4e5fb42d249be6a45a298f3c9543b111b02f7907 # v2
           env:
             SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
             SLACK_COLOR: '#870000'