Migrating to Next.js v16.3.0-canary.83

Version v16.3.0-canary.83 introduces 1 breaking change. This guide details how to update your code.

Released: 7/10/2026

Breaking Changes

Migration Steps

Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

LightningCSSReadable.toWeb()LinkServer ComponentTurbopackTypeScript CLI backend

Breaking Changes

●Issue #1

[PPF] Sync IO is only allowed in the dynamic stage: This change restricts synchronous IO operations to the dynamic stage, which may break existing implementations that relied on sync IO in other stages.

Release Summary

This release includes an experimental TypeScript CLI backend and various bug fixes, including improvements to LightningCSS support and request body handling. It also clarifies contribution policies and updates documentation for Turbopack and Progressive Web Apps.

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