# Next.js v16.4.0-canary.5

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-08-24
- Version: v16.4.0-canary.5
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.4.0-canary.5
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.4.0-canary.5
- 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** — Record fallback cache lifetime for blocking PPR routes
- **changed** — Split cold TurboMalloc accounting paths for performance improvement
- **changed** — Deduplicate the regress, wat/wasmparser and base64 dependencies

###### Misc Changes

- Record fallback cache lifetime for blocking PPR routes: #97821
- Document catchError for the Pages Router: #97748
- clippy: allow needless late init where it makes sense: #96410
- Turbopack: emit/collect: #96631
- docs: note that response headers must be set before calling handle() in a custom server: #97693
- Deduplicate the regress, wat/wasmparser and base64 dependencies: #97762
- perf: split cold TurboMalloc accounting paths: #97767

###### Credits 

Huge thanks to @acdlite, @devjiwonchoi, @wbinnssmith, @mischnic, @icyJoseph, @lukesandberg, and @sokra for helping!