# Material UI v9.0.0

- Product: Material UI (https://whatsnew.fyi/product/material-ui)
- Vendor: MUI
- Date: 2026-04-08
- Version: v9.0.0
- Original notes: https://github.com/mui/material-ui/releases/tag/v9.0.0
- Permalink: https://whatsnew.fyi/product/material-ui/releases/v9.0.0

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** — Use pointer events instead of mouse events in slider component
- **added** — Add border to switch component to make it visible in high contrast mode
- **changed** — Improve transitions performance and apply miscellaneous fixes
- **removed** — Remove unnecessary overridesResolvers from styled components

🥳 We're excited to announce the stable release of Material UI v9.0! This major release focuses on accessibility improvements, sx prop performance, and cleanup of deprecated APIs. See the [Material UI v9.0 announcement](https://mui.com/blog/introducing-material-ui-v9/) blog posts for more details. Also see the [MUI v9 announcement](https://mui.com/blog/introducing-mui-v9/) blog posts for the broad ecosystem updates.

Check out the [upgrade guide](https://mui.com/material-ui/migration/upgrade-to-v9/) to see how you can move to this version.

###### `@mui/material@9.0.0`

- [slider] Use pointer events instead of mouse events (#48164) @mj12albert
- [switch] Add border to make it visible in high contrast mode (#48180) @silviuaavram
- [transitions] Performance improvements & misc fixes (#48151) @mj12albert
- Remove unnecessary overridesResolvers from styled components (#48204) @sai6855

###### Core

- [code-infra] Setup workflow to publish internal packages (#47952) @brijeshb42
- [core-docs] Add `x-scheduler` to `MuiProductId` type (#48185) @rita-codes
- [docs-infra] Add scheduler to product switcher (#48208) @rita-codes
- [internal] Prepare libraries for v9 stable release (#48206) @siriwatknp

🙇‍♂️ We'd like to extend a big thank you to everyone involved who made this major release possible.