If you've spent any time managing Python dependencies, you know the drill: pip to install packages, venv or virtualenv for environments, pip-tools to pin versions, pyenv to switch interpreters, and pipx for command-line tools. That's a five-tool chain just to get a project running.
uv collapses all of it into a single binary. Written in Rust by the Astral team — the same people behind the Ruff linter — uv is an extremely fast Python package and project manager that installs Python, creates environments, resolves and locks dependencies, runs scripts, and manages standalone tools. The core pitch is simple: one tool, one workflow, no Python required to install it.
The speed is real
uv's headline feature is its speed. The Astral docs show the pip interface resolving and installing packages in milliseconds — tasks that pip often takes a full second or more to finish. Because it's compiled, it also claims to be dramatically faster than pip, and its hybrid universal-resolution lockfile means you can resolve once for multiple platforms instead of once per environment.
It's not just a speed claim. Astral ships uv rapidly, with patch and minor releases landing on an almost weekly cadence. As of this writing, the latest release is 0.12.14 (September 15, 2026), following 0.12.12 which arrived just a week earlier.
Install and go
Installation is straightforward, and because uv is a standalone binary, you don't need a working Python first:
pipx install uv
or
pip install uv
From there, the everyday workflow is short and pleasant:
uv python install 3.12 # install an interpreter, no pyenv needed
uv init my-project # scaffold a new project
cd my-project
uv add fastapi # add a dependency and update uv.lock
uv run pytest # run inside an auto-created env
A few things show up immediately. uv python installs and pins specific CPython versions without pyenv or a system package manager. uv.lock gives you reproducible, deterministic installs. uv run creates a virtualenv on demand and runs your code inside it — you can almost forget environments exist. And uvx runs a tool without permanently installing it, replacing pipx:
uvx ruff check .
There's also a familiar uv pip interface that mirrors pip and pip-tools, so it works with existing requirements.txt and pip-style workflows while you migrate.
Where things stand in 2026
One change worth knowing: OpenAI announced in March 2026 an agreement to acquire Astral, the company behind uv and Ruff, with the team joining its Codex organization. Early developer reactions are calm — uv's commands and docs remain the same, and the tool keeps its rapid release cadence. If anything, the news signals that fast, all-in-one Python tooling has become a mainstream bet.
uv isn't just faster than pip — for many teams it replaces the whole environment-tooling stack with one executable. If you're tired of juggling five tools to run one script, install uv and start your next project with uv init. The five-tool chain has finally met its match.