Prefect migrated its Python package setup from the traditional setup.py and setup.cfg to the modern pyproject.toml paradigm, streamlining its build and project configuration and consolidating numerous files into a single source of truth. This transition, made over two years after the initial suggestion, aligns with current best practices and simplifies management by housing package metadata, dependencies, and configuration for tools like pytest and ruff in one place. The migration leveraged modern tools such as hatch, versioningit, and uv, which facilitated better dependency management, a cleaner development environment, and an improved CI/CD process. By adopting these tools, Prefect achieved a more organized and efficient workflow, enabling seamless integration and development experiences. Additionally, the ability to maintain separate package configurations for each integration while linking them for development purposes was enhanced, along with version management improvements, which ensured backward compatibility and flexibility. This overhaul not only eased the development process but also made the CI/CD pipelines cleaner and more efficient, demonstrating significant benefits for the team and contributors.