# Next.js v15.5.5 — Release & Upgrade Intelligence
- **Product:** Next.js (https://nextjs.org)
- **Version:** v15.5.5
- **Released:** Oct 13, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/nextjs/updates/v15.5.5/

## Executive Summary (TL;DR)
Next.js v15.5.5. Source highlight: This release is backporting bug fixes. It does **not** include all pending features/changes on canary.

## New Features
- Add deprecation warning to Runtime config (#84650)
- feat: `experimental.middlewareClientMaxBodySize` body cloning limit  (#84722)

## Bug Fixes
- fix: unstable_cache should perform blocking revalidation during ISR revalidation (#84716)
- fix: missing next/link types with typedRoutes (#84779)
- docs: early October improvements and fixes (#84334)

## Upgrade Command
```bash
npm install --save-exact next@15.5.5
```