diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 79ac2af..5a957d5 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -15,9 +15,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5  # v2
     - name: Set up JDK 8
-      uses: actions/setup-java@v2
+      uses: actions/setup-java@91d3aa4956ec4a53e477c4907347b5e3481be8c9  # v2
       with:
         java-version: '8'
         distribution: 'adopt'