Worked on the tc39/ecma262 repository to upgrade the documentation build tooling by integrating ecmarkup version 21.4.0. Focused on enhancing the reliability and performance of the documentation process, the work involved careful dependency management and build automation using JavaScript. The upgrade addressed existing tooling limitations, enabling future bug fixes and improved rendering performance for documentation outputs. By aligning the documentation pipeline with the latest ecosystem standards, the changes reduced ongoing maintenance overhead and ensured compatibility with modern build tools. The approach demonstrated a methodical application of build tools and Git-based change management to support long-term project sustainability.