diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dc0fa6f78..fd901df25 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,6 +9,8 @@ on:
 jobs:
   benchmark:
     runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: gemfiles/rails_8.0.gemfile
     steps:
     - uses: actions/checkout@v4.1.1
     - name: Setup Ruby