# MobX 6.4.0

- Product: MobX (https://whatsnew.fyi/product/mobx)
- Vendor: MobX
- Date: 2022-02-17
- Version: 6.4.0
- Original notes: https://github.com/mobxjs/mobx/releases/tag/mobx%406.4.0
- Permalink: https://whatsnew.fyi/product/mobx/releases/6.4.0

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** — Remove any from 'merge' and 'replace' methods of ObservableMap
- **fixed** — Make the error message about Object.freeze more informative

###### Minor Changes

-   [`6b926833`](https://github.com/mobxjs/mobx/commit/6b926833ac7abbf92ff5c309613d2345f72527ee) [#3287](https://github.com/mobxjs/mobx/pull/3287) Thanks [@kubk](https://github.com/kubk)! - Remove any from 'merge' and 'replace' methods of ObservableMap

###### Patch Changes

-   [`dee35be4`](https://github.com/mobxjs/mobx/commit/dee35be427989b6adc3c8f7ae8dc632ea66f3538) [#3300](https://github.com/mobxjs/mobx/pull/3300) Thanks [@kubk](https://github.com/kubk)! - Make the error message about Object.freeze more informative