diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 79f544ee4..d0d7df527 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -24,7 +24,7 @@ jobs:
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Set up JDK
       uses: actions/setup-java@v2
       with:
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index f24988fa7..14c7d21bf 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -21,7 +21,7 @@ jobs:
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up JDK
         uses: actions/setup-java@v2
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3bdf19df7..9e57551aa 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/master'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Set up JDK 11
         uses: actions/setup-java@v2
         with: