diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a2d2565..9bcfafd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,7 +23,7 @@ jobs:
         persist-credentials: false
 
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@6bd3d993c602f6b675728ebaecb2b569ff86e99b # v1.174.0
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true