# Next.js v16.3.1-canary.26

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-08-20
- Version: v16.3.1-canary.26
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.3.1-canary.26
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.3.1-canary.26
- 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** — Upgrade React from eb8feb71-20260814 to eafeac09-20260819
- **changed** — Rename Turbopack to use turbopack: no side effects
- **changed** — Remove HmrTarget
- **changed** — Keep HMR instructions typed until serialization
- **changed** — Serialize frozen collections by value only
- **added** — Add unstable_navigation() API

###### Misc Changes

- docs: document deploymentId build ID override and Pages Router skew in 16.2: #97645
- Upgrade React from `eb8feb71-20260814` to `eafeac09-20260819`: #97636
- Turbopack: rename to use turbopack: no side effects: #94427
- refactor: move useDynamic{Route,Search}Params to reduce snapshot churn: #97360
- [PPF] unstable_navigation(): #96908
- [PPF] Scaffold unstable_navigation(): #97236
- docs: Explicit cache output description: #97548
- Improve Cache Components sync IO migration guidance: #97572
- [test] Use a non-native stub for the server externals list test: #97614
- Avoid GitHub API rate limits for create-next-app examples: #97612
- [test] Cover the prerender worker-thread backend with an addon we control: #97543
- [test] Convert the `prerender-native-module` suite to local fixture packages: #97542
- [test] Replace the `turbopack-reports` `sqlite3` dependency with a local addon fixture: #97541
- [test] Drop the dead `sqlite3` build approval from the `sharp-basic` suite: #97540
- [ci] Authenticate Turborepo remote caching with OIDC instead of a static PAT: #97590
- Remove HmrTarget: #97253
- Keep HMR instructions typed until serialization: #96569
- Serialize frozen collections by value only: #96686

###### Credits 

Huge thanks to @icyJoseph, @mischnic, @lubieowoce, @aurorascharff, @eps1lon, @sokra, and @wbinnssmith for helping!