diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f64bf69..eeb908e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     timeout-minutes: 15
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
     - name: Set up JDK 17
       uses: actions/setup-java@v4
       with: