diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 64a8e9b..b96a5dd 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -33,7 +33,7 @@ jobs:
     steps:
     # Needed to access the vcs repos file from the workspace
     - name: Checkout source
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
     - name: Run action-ros-ci to build and test
       uses: ros-tooling/action-ros-ci@0.1.2
       with:
diff --git a/.github/workflows/build_and_test_release_latest.yml b/.github/workflows/build_and_test_release_latest.yml
index c80f13b..b073f7c 100644
--- a/.github/workflows/build_and_test_release_latest.yml
+++ b/.github/workflows/build_and_test_release_latest.yml
@@ -29,7 +29,7 @@ jobs:
     steps:
     # Needed to access the vcs repos file from the workspace
     - name: Checkout source
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
     - name: Run action-ros-ci to build and test
       uses: ros-tooling/action-ros-ci@0.1.2
       with: