diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4bfa6df..0778219 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,7 +17,7 @@ jobs:
           - '3.4.5'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
       - name: Set up Ruby
         uses: ruby/setup-ruby@ed55d55e820a01da7d3e4863a8c51a61d73c3228
         with: