# Next.js v16.3.1-canary.21

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-08-16
- Version: v16.3.1-canary.21
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.3.1-canary.21
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.3.1-canary.21
- 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** — Anchor the async local storage instances to global symbols
- **changed** — Reorganize client router modules

###### Misc Changes

- Anchor the async local storage instances to global symbols: #97255
- test: deflake use-cache-size-zero warm reload: #97421
- Scaffolding for concurrentRouterQueue flag: #97413
- Reorganize client router modules: #97402

###### Credits 

Huge thanks to @unstubbable, @gnoff, and @acdlite for helping!