# Upgrading Mathjax to version 4

**URL:** https://meta.discourse.org/t/upgrading-mathjax-to-version-4/392669
**Category:** Development
**Tags:** math
**Created:** [November 23, 2025, 5:57pm UTC](https://meta.discourse.org/t/upgrading-mathjax-to-version-4/392669 "2025-11-23T17:57:05Z")
**Posts on this page:** 1
**Showing post:** 32

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### Author: ![Ethsim2](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/ethsim2/32/522255_2.png) [@Ethsim2](https://meta.discourse.org/u/Ethsim2)
#### Post date: [January 10, 2026, 1:09pm UTC](https://meta.discourse.org/t/upgrading-mathjax-to-version-4/392669/32 "2026-01-10T13:09:25Z")

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I’m currently on latest-release +17 on a fairly math-heavy production instance.

Really nice to see [grid] now working properly on Meta - that’s a big quality-of-life improvement for math-dense posts. I’m happy to compromise on [center] where needed.

For context, I previously ran into some edge-cases around math inside [grid] / [details], which I documented here (in case it’s still useful):

> [@warning Inline KaTeX/MathJax $...$ inside \[grid\] can leak BBCode when used with \[details\]](https://meta.discourse.org/t/inline-katex-mathjax-inside-grid-can-leak-bbcode-when-used-with-details/372802/3):
>
> i thought i should at least conculde mathematically accurate information, not ChatGPT waffle grinning_face \frac{1}{r^2 \sin\theta} \left| \begin{matrix} \textcolor{orange}{\hat{r}} & r\hat{\theta} & r\sin\theta\,\hat{\phi} \\ \partial\_r & \boxed{\partial\_\theta} & \boxed{\partial\_\phi} \\ A\_r & \boxed{r A\_\theta} & \boxed{r\sin\theta\, A\_\phi} \end{matrix} \right| \frac{1}{r^2 \sin\theta} \left| \begin{matrix} \textcolor{orange}{\hat{r}} & r\hat{\theta} & r\sin\theta\,\hat{\phi} \\ \p…

Thanks again to everyone working on the MathJax 4 upgrade - it’s great to see this level of polish landing.

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