diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 389ecdb..4d0ed2a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-ruby@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: '3.1.2'
           bundler-cache: true
       - name: Test with RSpec
         env: