●Change8

Migrating to Next.js v16.3.0-preview.10

Version v16.3.0-preview.10 introduces 2 breaking changes. This guide details how to update your code.

Released: 7/28/2026

2
Breaking Changes
2
Migration Steps
9
Affected Symbols

⚠️ Check Your Code

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

turbopackhttp-proxyhttpxy@mswjs/interceptorsurl.parse()generateStaticParamsexperimental.viewTransitionnext/font/googlegetChunkRelativeUrl()

Breaking Changes

●Issue #1

The `experimental.viewTransition` flag has been removed. View Transitions are now stable and do not require an experimental flag.

●Issue #2

Requests to unknown paths that are not document requests will now return a plain text 404 response instead of a JSON response.

Migration Steps

  1. 1
    Remove the `experimental.viewTransition` flag from your configuration as View Transitions are now stable.
  2. 2
    Update any code that relies on the specific JSON response format for 404 errors on non-document requests to handle plain text responses.

Release Summary

This release introduces significant improvements to Turbopack's performance and features, including better tree-shaking and source map handling. It also enhances prefetching strategies, refines dev validation processes, and updates documentation for features like View Transitions.

Need More Details?

View the full release notes and all changes for Next.js v16.3.0-preview.10.

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