# Next.js v15.5.23 — Release & Upgrade Intelligence
- **Product:** Next.js (https://nextjs.org)
- **Version:** v15.5.23
- **Released:** Aug 07, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/nextjs/updates/v15.5.23/

## Executive Summary (TL;DR)
Next.js v15.5.23. Source highlight: [15.x] Port ReplyServer traversal guards to FlightClient @eps1lon in https://github.com/vercel/next.js/pull/96405

## Upgrade Command
```bash
npm install --save-exact next@15.5.23
```