# MobX 6.13.1

- Product: MobX (https://whatsnew.fyi/product/mobx)
- Vendor: MobX
- Date: 2024-07-18
- Version: 6.13.1
- Original notes: https://github.com/mobxjs/mobx/releases/tag/mobx%406.13.1
- Permalink: https://whatsnew.fyi/product/mobx/releases/6.13.1

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Reduce memory footprint of Atom and Reaction using a bitfield

###### Patch Changes

-   [`5e711e0b4737fd6b5b3c6f9b32afd4f195bc5fc3`](https://github.com/mobxjs/mobx/commit/5e711e0b4737fd6b5b3c6f9b32afd4f195bc5fc3) [#3901](https://github.com/mobxjs/mobx/pull/3901) Thanks [@peterm-canva](https://github.com/peterm-canva)! - Shrink Atom and Reaction using a bitfield