diff --git a/.github/workflows/ubuntu-latest.yml b/.github/workflows/ubuntu-latest.yml
index 89a882c..5792ec0 100644
--- a/.github/workflows/ubuntu-latest.yml
+++ b/.github/workflows/ubuntu-latest.yml
@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1
       with:
         ruby-version: ${{ matrix.ruby }}
     - name: Build and test with Rake