Marc Fett stabilized the dependency update automation for the ls1intum/tum-apply repository by addressing a misconfiguration in the Renovate tool. He focused on configuration management and DevOps practices, using JSON to refine the automation process. By resolving the issue that caused inconsistent dependency updates, Marc enabled reliable, automatic updates that reduce vulnerability exposure and ongoing maintenance effort. His work involved careful analysis of the existing setup, precise adjustments to the Renovate configuration, and thorough documentation of changes through Git commits. This targeted fix improved the security and maintainability of the project, demonstrating depth in automation reliability and collaborative development workflows.