Worked on the yuwata/systemd repository to enhance CI/CD security and stability by introducing two targeted features. Implemented a seven-day cooldown for Dependabot updates using YAML configuration, reducing disruptive dependency churn while maintaining timely security patches. Additionally, disabled credential persistence in GitHub Actions workflows to mitigate the risk of sensitive information exposure in build artifacts and logs. Focused on risk reduction and deployment predictability rather than user-facing bug fixes, the work leveraged skills in DevOps, CI/CD, and dependency management. These changes contributed to safer and more predictable automation pipelines, emphasizing secure practices and controlled update flows within the development process.