# Next.js v15.3.0 — Release & Upgrade Intelligence
- **Product:** Next.js (https://nextjs.org)
- **Version:** v15.3.0
- **Released:** Apr 09, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/nextjs/updates/v15.3.0/

## Executive Summary (TL;DR)
Next.js v15.3.0. Source highlight: [dev-overlay] Customize `<select>` styling for consistency: #76973

## New Features
- [metadata]: add pinterest meta tag: #76988
- [dev-overlay] Add `size` setting to preferences: #77027
- Add config for only generating static env: #77038
- Add dev warning for cross-origin and stabilize allowedDevOrigins: #77044
- Add experimental build mode flag for env: #77089
- (feat) support client-side instrumentation: #76916

## Improvements
- Slightly improve error handling for unknown server actions: #77135
- [perf] skip loading client manifest for static metadata routes: #77260
- [logging] improve logging of port retry: #77868
- perf(turbopack): Merge nodes with same starting point: #76938

## Bug Fixes
- Fix JSDoc comment for `'seconds'` cache life profile: #77084
- Fix output standalone for alternative bundler: #76971
- [dev-overlay] Fix stacking order of highlighted line: #77189
- fix(styled-jsx): Pass `useLightningcss` option to `styled-jsx` correctly: #77008
- chore(HMR clients): Fix a bunch of typescript errors by including the appropriate webpack type declarations: #77207
- fix: pass telemetry plugin rspack tests: #77257

## Upgrade Command
```bash
npm install --save-exact next@15.3.0
```