uv-build: Python Build Backend is Astral's Rust-based build backend for Python packages. As of uv-build 0.11.11 (May 2026), it is the native backend documented by uv for most pure Python packages. Pure Python packages only: no C/Rust extensions. When to Use uv-build Migration blocker: is not supported . Projects using with hatchling/setuptools must switch to static versions in pyproject.toml (use for version management). Setup For published packages and CI, prefer an upper bound such as so new minor releases are adopted deliberately after verification. The Direct Build Fast Path When uv detec…