# Toolchain upgrade on windows?

**URL:** <https://discuss.python.org/t/toolchain-upgrade-on-windows/6377>\
**Category:** Packaging\
**Created:** [December 29, 2020, 12:47am UTC](https://discuss.python.org/t/toolchain-upgrade-on-windows/6377 "2020-12-29T00:47:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![steve.dower](https://sea2.discourse-cdn.com/flex002/user_avatar/discuss.python.org/steve.dower/32/56_2.png) [@steve.dower](https://discuss.python.org/u/steve.dower)\
**Post date:** [December 29, 2020, 7:02pm UTC](https://discuss.python.org/t/toolchain-upgrade-on-windows/6377/2 "2020-12-29T19:02:58Z")

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Can you explain why the compiler version matters?

It should only depend on the runtime version, which has been 14.x since CPython 3.5, but if there’s some other place where the compiler version leaks into extension modules it’d be nice to know about it.

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