Autumn upgraded the Duperemove tool to version 0.15 in the chimera-linux/cports repository, focusing on modernizing the build system and refining dependency management. They moved Duperemove to the user directory to streamline packaging and updates, implemented atomic progress counters for improved reliability, and removed the libbsd dependency to enhance portability. By switching the codebase to the C23 standard and adding xxhash-devel as a dependency, Autumn ensured future maintainability and compatibility. Their work, primarily in C and Python, addressed build-time issues and laid the groundwork for future optimizations, reflecting a methodical approach to system-level engineering and release preparation.