Worked on enhancing the CI security for the ruby/ruby repository by updating the GitHub Actions workflow configuration. Focused on hardening the actions/checkout step, the developer set the persist-credentials parameter to false within the main.yml.tt template using YAML, ensuring that sensitive credentials would not be written to disk during CI runs. This adjustment reduced the risk of credential leakage while maintaining existing CI behavior and build reliability. Demonstrated skills in CI/CD pipeline management, GitHub Actions templating, and security best practices, the work improved the repository’s security posture through a targeted, traceable change without introducing regressions or impacting developer workflows.