diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd83ec8ec..8ff79d626 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,7 +55,7 @@ jobs:
       - uses: actions/cache@v2
         with:
           path: vendor/bundle
-          key: v1-rubygems-local-${{ runner.os }}-${{ matrix.ruby }}-${{ hashFiles(format('gemfiles/{0}.gemfile.lock', matrix.rails_appraisal)) }}
+          key: v1-rubygems-local-${{ runner.os }}-${{ matrix.ruby }}-${{ hashFiles(format('gemfiles/{0}.gemfile.lock', matrix.appraisal)) }}
       - name: Install dependencies
         run: bundle install --jobs=3 --retry=3
       - name: Run Unit Tests