# 🚀 Release v6.4.0

**URL:** <https://discourse.pymc.io/t/release-v6-4-0/17988>\
**Category:** News\
**Created:** [November 1, 2026, 12:55am UTC](https://discourse.pymc.io/t/release-v6-4-0/17988 "2026-11-01T00:55:22Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![pymc-bot](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/pymc-bot/32/9384_2.png) [@pymc-bot](https://discourse.pymc.io/u/pymc-bot)\
**Post date:** [November 1, 2026, 12:55am UTC](https://discourse.pymc.io/t/release-v6-4-0/17988/1 "2026-11-01T00:55:22Z")

</div>

A new release of **pymc** is now available!

## 📦 Release Information

- **Version:** `v6.4.0`
- **Repository:** [pymc-devs/pymc](https://github.com/pymc-devs/pymc)
- **Release Page:** [Release v6.4.0 · pymc-devs/pymc · GitHub](https://github.com/pymc-devs/pymc/releases/tag/v6.4.0)
- Note: It may take some time for the release to appear on PyPI and conda-forge.

## 📋 Release Notes

## What’s Changed

### Major Changes 🛠

- Build project with pyproject.toml by [@Armavica](https://github.com/Armavica) in [#8011](https://github.com/pymc-devs/pymc/pull/8011)
- Modernize find\_MAP by [@velochy](https://github.com/velochy) in [#8429](https://github.com/pymc-devs/pymc/pull/8429)

### New Features 🎉

- Add Pareto to pymc.dims by [@williambdean](https://github.com/williambdean) in [#8422](https://github.com/pymc-devs/pymc/pull/8422)
- Add Neumann and mixed boundary conditions to HSGP by [@juanitorduz](https://github.com/juanitorduz) in [#8433](https://github.com/pymc-devs/pymc/pull/8433)
- Add more distributions to pymc.dims by [@williambdean](https://github.com/williambdean) in [#8487](https://github.com/pymc-devs/pymc/pull/8487)

### Bugfixes 🪲

- Respect sample dims in `apply_function_over_dataset` by [@ricardoV94](https://github.com/ricardoV94) in [#8426](https://github.com/pymc-devs/pymc/pull/8426)
- Make ZeroSumNormal zero-sum check tolerance dtype-aware by [@velochy](https://github.com/velochy) in [#8464](https://github.com/pymc-devs/pymc/pull/8464)
- Fix dims coercion to list in model\_from\_fgraph by [@williambdean](https://github.com/williambdean) in [#8465](https://github.com/pymc-devs/pymc/pull/8465)
- Fix DiscreteUniform.logcdf at the lower bound by [@anishmehta24](https://github.com/anishmehta24) in [#8452](https://github.com/pymc-devs/pymc/pull/8452)
- Fix LKJ (corr and cov) forward sampling for n\>2, and log density normalization by [@tjburch](https://github.com/tjburch) in [#8497](https://github.com/pymc-devs/pymc/pull/8497)
- Fix dataset-to-point conversion with no sample dimensions by [@j45856021-dev](https://github.com/j45856021-dev) in [#8490](https://github.com/pymc-devs/pymc/pull/8490)

### Documentation 📖

- DOC: remove progressbar\_theme from compute\_deterministics docstring by [@ZainnQureshii](https://github.com/ZainnQureshii) in [#8456](https://github.com/pymc-devs/pymc/pull/8456)
- Update architecture guide by [@abhioverdue](https://github.com/abhioverdue) in [#8475](https://github.com/pymc-devs/pymc/pull/8475)

### Maintenance 🔧

- Slice sampler: cap expansion steps per dimension by [@ricardoV94](https://github.com/ricardoV94) in [#8420](https://github.com/pymc-devs/pymc/pull/8420)
- Better support for pm.fit(…, backend=“jax”) by [@hrideymarwah15](https://github.com/hrideymarwah15) in [#8472](https://github.com/pymc-devs/pymc/pull/8472)
- Improve VonMises logp overflow for large kappa by [@spicysharkco](https://github.com/spicysharkco) in [#8503](https://github.com/pymc-devs/pymc/pull/8503)
- Small cleanups and bug fixes by [@ricardoV94](https://github.com/ricardoV94) in [#8522](https://github.com/pymc-devs/pymc/pull/8522)
- Update to pytensor 3.3.5 and better-optimize 0.5, and clear deprecations by [@jessegrabowski](https://github.com/jessegrabowski) in [#8584](https://github.com/pymc-devs/pymc/pull/8584)

## New Contributors

- [@anurag-mds](https://github.com/anurag-mds) made their first contribution in [#8430](https://github.com/pymc-devs/pymc/pull/8430)
- [@ZainnQureshii](https://github.com/ZainnQureshii) made their first contribution in [#8456](https://github.com/pymc-devs/pymc/pull/8456)
- [@SatvikMishra08](https://github.com/SatvikMishra08) made their first contribution in [#8474](https://github.com/pymc-devs/pymc/pull/8474)
- [@abhioverdue](https://github.com/abhioverdue) made their first contribution in [#8475](https://github.com/pymc-devs/pymc/pull/8475)
- [@anishmehta24](https://github.com/anishmehta24) made their first contribution in [#8452](https://github.com/pymc-devs/pymc/pull/8452)
- [@hrideymarwah15](https://github.com/hrideymarwah15) made their first contribution in [#8472](https://github.com/pymc-devs/pymc/pull/8472)
- [@spicysharkco](https://github.com/spicysharkco) made their first contribution in [#8503](https://github.com/pymc-devs/pymc/pull/8503)
- [@j45856021-dev](https://github.com/j45856021-dev) made their first contribution in [#8490](https://github.com/pymc-devs/pymc/pull/8490)

**Full Changelog** : [Comparing v6.3.2...v6.4.0 · pymc-devs/pymc · GitHub](https://github.com/pymc-devs/pymc/compare/v6.3.2...v6.4.0)

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_This post was automatically generated from the GitHub release._