# Material UI v9.1.1

- Product: Material UI (https://whatsnew.fyi/product/material-ui)
- Vendor: MUI
- Date: 2026-06-23
- Version: v9.1.1
- Original notes: https://github.com/mui/material-ui/releases/tag/v9.1.1
- Permalink: https://whatsnew.fyi/product/material-ui/releases/v9.1.1

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** — Update Autocomplete fullWidth prop documentation
- **fixed** — Fix focus ripple lingering after blur in ButtonBase
- **changed** — Server-render InitColorSchemeScript in tests for React 19.3
- **fixed** — Mount child in Transition in same commit when opening from unmounted
- **fixed** — Prevent enableCssLayer styles from being overridden by unlayered styles in styled-engine
- **changed** — Update dependencies to resolve Dependabot security alerts
- **changed** — Pin StackBlitz demo vite to v7 and plugin-react to v5
- **changed** — Port codebase to use tsgo
- **fixed** — Fix immutable cache headers for /_next/static assets in docs-infra
- **changed** — Run link checker during docs build instead of as separate CI step
- **added** — Support turbopack for docs

A big thanks to the 9 contributors who made this release possible.

###### `@mui/material@9.1.1`

- [Autocomplete] Update fullWidth prop documentation (#48626) @vipin8797
- [ButtonBase] Fix focus ripple lingering after blur (#48650) @siriwatknp
- [InitColorSchemeScript] Server-render in tests for React 19.3 (#48604) @Janpot
- [Transition] Mount child in same commit when opening from unmounted (#48649) @siriwatknp

###### `@mui/styled-engine@9.1.1`

- [styled-engine] Prevent enableCssLayer styles from being overridden by unlayered styles (#48603) @Janpot

###### Docs

- Send SOURCE to Brevo on newsletter subscribe (#48633) @aemartos
- fix TypeScript heading capitalization (#48619) @ifer47
- Remove outdated security section (#48628) @oliviertassinari
- [legal] Update EULA links on website (#48642) @rluzists1

###### Core

- Update dependencies to resolve Dependabot security alerts (#48641) @Janpot
- [core-docs] Pin StackBlitz demo vite to v7 and plugin-react to v5 (#48643) @Janpot
- [code-infra] Port codebase to use tsgo (#48616) @brijeshb42
- [docs-infra] Fix immutable cache headers for /\_next/static assets (#48655) @brijeshb42
- [docs-infra] Run link checker during docs build instead of as separate CI step (#48634) @Janpot
- [docs-infra] Support turbopack for docs (#48569) @brijeshb42
- [test] Cover docs landing-page composites with Argos (#48589) @LukasTy

All contributors of this release in alphabetical order: @aemartos, @brijeshb42, @ifer47, @Janpot, @LukasTy, @oliviertassinari, @rluzists1, @siriwatknp, @vipin8797