Worked on the Saghen/nixpkgs repository to deliver a critical update for the vintagestory package, upgrading it to version 1.20.4. This involved updating the source URL and SHA256 to match the latest stable release, ensuring that the Nix package manager could reliably fetch and build the new version. The work focused on package management using Nix, with careful attention to version pinning and source integrity. By adhering to Nix packaging best practices and providing a clear commit history, the update improved the reliability of downstream upgrades and reduced maintenance overhead for users depending on the vintagestory package.