Worked on the Saghen/nixpkgs repository to upgrade the fusuma dependency from version 3.5.0 to 3.7.0, addressing the need for access to newer features and security updates. The process involved updating both Gemfile.lock and gemset.nix, ensuring that the correct SHA256 was used for reproducible builds and proper package management. Focused on technical modernization and minimizing maintenance overhead, the work aligned with repository standards for dependency management. Utilized Nix and Ruby package management skills to implement the upgrade, emphasizing build reproducibility and technical alignment. No bugs were fixed during this period, with efforts concentrated on targeted feature enhancement and modernization.