diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 93a2dee..540911a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
           - integrationTestMounts
           - integrationTestXenitEndpoints
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - uses: actions/setup-java@v1
         with:
           java-version: 1.11
@@ -59,7 +59,7 @@ jobs:
         version:
           - solr6
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
       - name: Login to CloudSmith