Stephan contributed to the Homebrew/homebrew-core repository by updating the GitLab CLI tool (glab) formula to version 1.78.2, ensuring Homebrew users received the latest features in sync with upstream GitLab CLI releases. He focused on formula maintenance using Ruby, applying version bumping techniques and validating releases to maintain stability and parity. His work involved careful management of package dependencies and clear commit traceability, supporting a smooth upgrade path for end users. While the scope was limited to a single feature over one month, Stephan demonstrated a solid grasp of command-line tools and package management workflows within the Homebrew ecosystem.