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Default Python 3.15 and strict uv constraints

uv 0.13.0 makes Python 3.15 the default.

  • TOOLING
Release0.13.09 October 2026

uv

Extremely fast Python package and project manager written in Rust.

Changes default stable Python to 3.15 and tightens constraints checking.

Licence
Apache-2.0
Platform
macOS, Linux, Windows (Rust-based binary)
Release0.162.19 October 2026

codex

Lightweight terminal coding agent with asynchronous interaction support.

Fixes TUI crashes on multi-line async questions and aligns background feature defaults.

Licence
Apache-2.0
Platform
Terminal (Cross-platform Rust binary)

What this changes

Python tooling shifts toward stricter dependency rules and newer language defaults as uv 0.13.0 establishes Python 3.15 as its baseline while tightening constraint file evaluation across enterprise projects; teams should test it in a reversible pilot before adoption.

The card

Default Python 3.15 and strict uv constraints — the card published on 10 October 2026

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Sources

Source: GitHub, 9 Oct 2026 - https://github.com/astral-sh/uv/releases/tag/0.13.0; Source: GitHub, 9 Oct 2026 - https://github.com/openai/codex/releases/tag/rust-v0.162.1

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