diff --git a/.github/workflows/candidate.yml b/.github/workflows/candidate.yml
index a5ac7e9..e272be3 100644
--- a/.github/workflows/candidate.yml
+++ b/.github/workflows/candidate.yml
@@ -45,6 +45,9 @@ jobs:
       rails_tag_object: ${{ steps.clients.outputs.rails_tag_object }}
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: ruby/setup-ruby@003a5c4d8d6321bd302e38f6f0ec593f77f06600 # v1
+        with:
+          ruby-version: "3.4"
       - id: matrix
         run: echo "value=$(ruby scripts/matrix_json.rb)" >> "$GITHUB_OUTPUT"
       - id: clients