# Next.js v16.3.4

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-08-31
- Version: v16.3.4
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.3.4
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.3.4

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Re-enable AVIF Image Optimization
- **fixed** — Fix infinite recursion in testmode passthrough fetch
- **fixed** — Fix build error when aliasing typescript to @typescript/typescript6
- **fixed** — Fix unset crossOrigin in Turbopack manifests

Follow-up release to [v16.3.3](https://github.com/vercel/next.js/releases/tag/v16.3.3) re-enabling AVIF Image Optimization ([#97949](https://github.com/vercel/next.js/pull/97949)).

The following bug fixes have been backported. It does **not** include all pending features/changes on canary.

- testmode: Fix infinite recursion in testmode passthrough fetch (#97691)
- Fix build error when aliasing typescript to @typescript/typescript6 (#97997)
- Fix unset crossOrigin in Turbopack manifests (#97930)

###### Credits

Huge thanks to @eps1lon, @mischnic, and @timneutkens for helping!