diff --git a/.github/workflows/ci-workflow.yml b/.github/workflows/ci-workflow.yml
index 2dc0b816649..edab1aa253b 100644
--- a/.github/workflows/ci-workflow.yml
+++ b/.github/workflows/ci-workflow.yml
@@ -14,7 +14,7 @@ jobs:
   housekeeping:
     runs-on: ubuntu-16.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
 
     - name: Set up Python
       uses: actions/setup-python@v2.2.1
@@ -55,7 +55,7 @@ jobs:
       matrix:
         python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
 
     - uses: actions/setup-python@v2.2.1
       with:
diff --git a/.github/workflows/configlet.yml b/.github/workflows/configlet.yml
index c86ed0cf593..3d7cdecf337 100644
--- a/.github/workflows/configlet.yml
+++ b/.github/workflows/configlet.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
+    - uses: actions/checkout@v2.3.4
 
     - name: Fetch configlet
       uses: exercism/github-actions/configlet-ci@main
diff --git a/.github/workflows/test-runner.yml b/.github/workflows/test-runner.yml
index 4d1b7dd01fb..7ba9f870fb0 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@v2
+      - uses: actions/checkout@v2.3.4
       - name: Run test-runner
         run: docker-compose run test-runner