diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index dcca1ca..f925af2 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -39,7 +39,7 @@ 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 ed5debb..cec355e 100644
--- a/.github/workflows/build_and_test_release_latest.yml
+++ b/.github/workflows/build_and_test_release_latest.yml
@@ -35,7 +35,7 @@ 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: