diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c163835..0bef8c6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
 
       - name: set up JDK 11
         uses: actions/setup-java@v2
diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index 2d4d5be..71a1bc6 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -11,7 +11,7 @@ jobs:
   build-docker-hotspot:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 0
       - name: Set up QEMU
@@ -39,7 +39,7 @@ jobs:
   build-docker-openj9:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 0
       - name: Set up QEMU