A big thanks to the 22 contributors who made this release possible. Here are some highlights:

• ✨ Material UI's ToggleButtonGroup now supports non-button element as a child (e.g., showing a Tooltip on a disabled ToggleButton) (#40220) @Methuselah96

@mui/material@5.15.4

• [TextField][FormLabel][InputLabel][FormControl] Use exact children type to allow React children type augmentation (#38872) @nicegamer7
• [Select] Add form submission regression test (#40176) @mj12albert
• [ToggleButtonGroup] Support different elements under it (#40220) @Methuselah96
• [ClickAwayListener] Fix export of types (#40485) @illume

@mui/material-nextjs@5.15.4

• Improve build size issue (#40436) @siriwatknp

@mui/icons-material@5.15.4

• Update the icons (#40365) @michaldudak

@mui/system@5.15.4

• [zero] Move zero runtime related packages (#40426) @brijeshb42
• Fix all use of styled(Box) (#40449) @oliviertassinari

@mui/utils@5.15.4

• Fix isPlainObject to work across realm (#39981) @brijeshb42

@mui/base@5.0.0-beta.31

• [base-ui][NumberInput] Remove inputId and inputRef types from NumberInput component (#40425) @sai6855

@mui/joy@5.0.0-beta.22

• [Badge] Shouldn't crash when using custom size (#39986) @iamsaumya
• [ToggleButtonGroup] Add JoyToggleButtonGroup to extendTheme's components type export (#40407) @RiceCrisp

Docs

• [base-ui] Visual tweaks to the plain CSS theme stylesheet (#40487) @zanivan
• [base-ui] Add tokens to plain CSS theme stylesheet (#40113) @zanivan
• [base-ui] Update the overview page (#40412) @danilo-leal
• [material-ui][Drawer] Resolve flickering when double-clicking on the backdrop to close it (#40343) @aacevski
• [material-ui] Refactor form submission in FormDialog component (#40470) @sai6855
• [material-ui] Replace recharts with MUI X charts on the Dashboard template (#40107) @alexfauquette
• [material-ui] Revise the Alert demo page (#34892) @samuelsycamore
• [material-ui] Revise the Accordion page (#40284) @anle9650
• [material-ui] Add docs for complementary Card components (#40346) @anle9650
• [material-ui] Add Material 3 components page (#40350) @DiegoAndai
• Fix strange italic style @oliviertassinari
• Fix references to ESLint @oliviertassinari
• Fix 301 redirections @oliviertassinari
• Right-to-left revision and addition to Joy UI (#39158) @danilo-leal

Core

• [examples] Use material-nextjs integration package (#40199) @siriwatknp
• [code-infra] Configure build dependencies in nx (#40482) @michaldudak
• [code-infra] Don't require noreferrer on target link (#40447) @oliviertassinari
• [code-infra] Use tsx instead of ts-node (#40428) @michaldudak
• [code-infra] Add options to docs-api generation to support X code structure (#40111) @alexfauquette
• [docs-infra] Add types for withDocsInfra (#40301) @oliviertassinari
• [docs-infra] Fix anchor links in API pages (#40450) @oliviertassinari
• [docs-infra] Fix API table full-width (#40476) @oliviertassinari
• [docs-infra] Fix the copy button overlapping with the scrollbar (#40405) @danilo-leal
• [docs-infra] Remove explicit mui-x dependency resolving (#40257) @LukasTy
• [docs-infra] Update the outlined Demo container dark mode color (#40488) @danilo-leal
• [core] Lock file maintenance (#34538) @renovate[bot]
• [core] Remove duplicate devDependencies (#40438) @michaldudak
• [core] Remove issue emoji @oliviertassinari
• [core] Move prefetch at the core, will propagate to MUI X @oliviertassinari
• [core] Change package manager to pnpm (#36287) @Janpot
• [core][docs] Remove the "Understand MUI packages" page (#39835) @savalaram-redkar
• [website] Evolve the Developer Advocate role (#40337) @oliviertassinari
• [website] Fix default social card @oliviertassinari
• [test] Restore the t command (#40430) @michaldudak

All contributors of this release in alphabetical order: @aacevski, @alexfauquette, @anle9650, @brijeshb42, @danilo-leal, @DiegoAndai, @iamsaumya, @illume, @Janpot, @LukasTy, @Methuselah96, @michaldudak, @mj12albert, @nicegamer7, @oliviertassinari, @renovate[bot], @RiceCrisp, @sai6855, @samuelsycamore, @savalaram-redkar, @siriwatknp, @zanivan