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pip v26.1 adds support for relative dependency cooldowns
(sethmlarson.dev)
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this post was submitted on 29 Apr 2026
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https://pip.pypa.io/en/latest/reference/requirements-file-format/
Looking at the format it supports bare, pinned, or version ranges.
I imagine ranges are preferred for libraries as you'd hit version conflicts if the same dependency showed up twice with different pinned versions in the dependency tree.
https://pip.pypa.io/en/stable/topics/dependency-resolution/#backtracking
The post suggests that during backtracking the maximum version considered for any dependency must be a certain age to reduce the attack surface of malicious releases assuming the vulnerability will be caught within the desired window.