diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1e06f1da..7361d949 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
         racket-version: ['8.8', '8.9', '8.10']
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
 
       - uses: Bogdanp/setup-racket@0094a9d8bd157633293a2210f373bb542687fa6d
         with: