Worked on security patching and dependency management for the DefinitelyTyped/DefinitelyTyped repository, focusing on remediating a critical vulnerability in the axios dependency. Addressed CVE-2026-40175 by upgrading axios to version 1.15.0 across multiple packages, ensuring improved security compliance and maintaining compatibility for downstream users. Utilized JSON for dependency configuration and validation, leveraging automated tooling to streamline the upgrade process. Validated the changes against existing tests and downstream usage to prevent regressions or breaking changes. The work emphasized secure defaults and robust dependency hygiene, contributing to the repository’s overall reliability while demonstrating a methodical approach to security and maintenance.