Denast upgraded the fusuma dependency from version 3.5.0 to 3.7.0 in the Saghen/nixpkgs repository, focusing on modernizing package management and improving build reproducibility. The work involved updating both Gemfile.lock and gemset.nix to reflect the new version and its SHA256 hash, ensuring that the Nix package manager consistently used the correct gem. By aligning the dependency with upstream standards, Denast reduced maintenance overhead and minimized drift in the codebase. The project was implemented using Nix and Ruby, demonstrating a methodical approach to dependency management and technical modernization, though the scope was limited to a single targeted feature.