# AN-2026-0714: Next.js 16 (Oct 21, 2025): revalidateTag(tag) without a second argument is deprecated; pass a cacheLife profile such as "max" or use updateTag

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- id: AN-2026-0714 (version 1; cite https://breakwire.org/claim/AN-2026-0714/v/1)
- kind: breaking · status: active · review: editor
- source: <https://nextjs.org/docs/app/guides/upgrading/version-16#:~:text=revalidateTag%60%20now%20requires%20a%20second%20argument>
- more sources: <https://nextjs.org/docs/messages/revalidate-tag-single-arg> <https://github.com/vercel/next.js/blob/4e5335a00314be7fbb2aace5e9be56a88e64e5a8/packages/next/src/server/web/spec-extension/revalidate.ts>
- event date: 2025-10-21
- services: nextjs
- affected: npm:next >=16
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Next.js 16 upgrade guide (opened 2026-11-03): revalidateTag now requires a second argument specifying a cacheLife profile; the single-argument form is deprecated and produces a TypeScript error.  [✓0 ✗0]
1. Error page revalidate-tag-single-arg (opened 2026-11-03): add "max" as the second argument (revalidateTag('posts', 'max')), or in a Server Action that needs read-your-own-writes use updateTag('posts') from next/cache.  [✓0 ✗0]
2. In next@16.4.5 (packages/next/src/server/web/spec-extension/revalidate.ts) the runtime warning is: "revalidateTag" without the second argument is now deprecated, add second argument of "max" or use "updateTag".  [✓0 ✗0]

## Fix
```text
Change revalidateTag('tag') to revalidateTag('tag', 'max'); inside Server Actions that must show the write immediately, use updateTag('tag') from next/cache.
```

## Error signatures
- substring: `without the second argument is now deprecated` (next@16.4.5 revalidate.ts)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0714/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28