# Next.js v16.4.0-canary.16

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-09-03
- Version: v16.4.0-canary.16
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.4.0-canary.16
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.4.0-canary.16
- Labels: Pre-release

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** — Return client errors for unrecognized Server Actions
- **changed** — Skip ignored files during server tracing in Turbopack
- **changed** — Upgrade web-vitals to v6 and report soft navigations
- **changed** — Upgrade React from 21c89c9f-20260901 to f4e439e1-20260902

###### Misc Changes

- test: remove stale deploy manifest exclusions: #98051
- Enable hourly next-maintainer auto-close workflow: #98225
- Return client errors for unrecognized Server Actions: #98123
- Add Next Maintainer auto-close workflow: #98197
- perf(turbopack): skip ignored files during server tracing: #97475
- docs: note that experimental.taint taints process.env: #98145
- test: preserve static params during Cache Components migration: #98209
- Upgrade web-vitals to v6 and report soft navigations: #97232
- Upgrade React from `21c89c9f-20260901` to `f4e439e1-20260902`: #98188

###### Credits 

Huge thanks to @gnoff, @marcoshernanz, @jimmyhmiller, @icyJoseph, @aurorascharff, and @timneutkens for helping!