Jules Magois contributed to the hmemcpy/nixpkgs repository by upgrading and stabilizing the Mixxx package, focusing on build systems and package management using Nix. Jules updated Mixxx to version 2.5.1 and upgraded its dependency, libdjinterop, to 0.24.3, ensuring compatibility and access to the latest features. To address build reliability, Jules pinned the build to a known-good revision and disabled benchmarks, reducing the risk of build failures and minimizing downstream maintenance. This work provided a more stable and up-to-date Mixxx experience for nixpkgs users, demonstrating a thoughtful approach to dependency management and build process hardening.