# pip ResolutionImpossible with incompatible Python runtime — Software interface version compatibility

For pip ResolutionImpossible with incompatible Python runtime, product is pip; software version is pip; dependency version is Python 3.6 vs 3.9 constraints, recorded from its source on 2026-08-04.

- **Product:** pip _(unconfirmed — we could not tie this to the quote below)_
- **Version pairing:** pip ResolutionImpossible with incompatible Python runtime _(unconfirmed — we could not tie this to the quote below)_
- **Software version:** pip _(unconfirmed — we could not tie this to the quote below)_
- **Dependency version:** Python 3.6 vs 3.9 constraints _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Misleading ResolutionImpossible message w/ a requirement duplicate and an incompatible Python runtime

## Source

- https://github.com/pypa/pip/issues/11321

Last verified: 2026-08-04. Review by: 2026-10-03.
Part of [Software interface version compatibility](https://referencesource.org/software-interface-version-compatibility/).