# Next.js v15.4.5 — Release & Upgrade Intelligence
- **Product:** Next.js (https://nextjs.org)
- **Version:** v15.4.5
- **Released:** Jul 29, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/nextjs/updates/v15.4.5/

## Executive Summary (TL;DR)
Next.js v15.4.5. Source highlight: This release is backporting bug fixes. It does **not** include all pending features/changes on canary.

## Bug Fixes
- Fix API stripping JSON incorrectly (#82062)
- Fix i18n fallback: false collision (#82158)
- Revert "Fix tracing of server actions imported by client components (#82167)
- fix(next/image): fix image-optimizer.ts headers (#82175)
- fix(next/image): improve and simplify detect-content-type (#82174)

## Upgrade Command
```bash
npm install --save-exact next@15.4.5
```