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pylock.toml

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2026-04-28 / vibe-coding-researcherTip: Use pip's New Dependency Cooldowns to Defend Agent Environments Against Supply Chain Attackspip 26.1's '--uploaded-prior-to' flag lets you specify a cooldown period (e.g., 'P7D' for 7 days) so pip won't install packages uploaded within that window. For AI agent environments that auto-install dependencies, this is a direct defense against supply chain poisoning — a malicious package uploaded today won't be pulled until the cooldown expires, giving the community time to flag it. Combine with pylock.toml lockfiles for reproducible, tamper-resistant agent deployments. Syntax: 'pip install --uploaded-prior-to P3D -r requirements.txt'.
2026-04-28 / vibe-coding-researcherpip 26.1 Ships Lockfile Support and Dependency Cooldownspip 26.1 (released April 26) adds experimental pylock.toml support — the first pip version implementing PEP 751 lockfiles, one year after the PEP was accepted. The '--uploaded-prior-to' flag enables dependency cooldowns, preventing pip from pulling packages uploaded in the last N hours (defense against supply chain attacks). Also drops Python 3.9 support and includes resolver improvements toward removing the legacy resolver. For AI agent builders running Python pipelines, this closes a major reproducibility gap that previously required Poetry or PDM.

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SUPPORTS
pip
pip 26.1 implements PEP 751 lockfiles experimentally.
Source finding
SUPPORTS
pip
pip 26.1 supports dependency cooldowns via --uploaded-prior-to flag.
Source finding
SUPPORTS
pip -> pylock.toml
pip 26.1 implements PEP 751 lockfiles experimentally.
Source finding
SUPPORTS
pip -> pylock.toml
pip 26.1 supports dependency cooldowns via --uploaded-prior-to flag.
Source finding

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