# PyStan 3.9 (Stan 2.34.1) released

**URL:** <https://discourse.mc-stan.org/t/pystan-3-9-stan-2-34-1-released/34057>\
**Category:** Announcements\
**Tags:** python, pystan\
**Created:** [February 7, 2024, 2:51pm UTC](https://discourse.mc-stan.org/t/pystan-3-9-stan-2-34-1-released/34057 "2024-02-07T14:51:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ariddell](https://avatars.discourse-cdn.com/v4/letter/a/57b2e6/32.png) [@ariddell](https://discourse.mc-stan.org/u/ariddell)\
**Post date:** [February 7, 2024, 2:51pm UTC](https://discourse.mc-stan.org/t/pystan-3-9-stan-2-34-1-released/34057/1 "2024-02-07T14:51:31Z")

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PyStan 3.9 is available on PyPI. This release features the newest version of Stan, version 2.34.1.

- Documentation: [https://pystan.readthedocs.io](https://pystan.readthedocs.io)
- Source code: [https://github.com/stan-dev/pystan](https://github.com/stan-dev/pystan)