diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 69696d2..96efa0b 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -32,7 +32,7 @@ jobs:
     # uses: ruby/setup-ruby@v1
       uses: ruby/setup-ruby@943103cae7d3f1bb1e4951d5fcc7928b40e4b742 # 1.177.1
       with:
-        ruby-version: ${{ matrix.ruby }}
+        ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Run tests
       run: bundle exec rake