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Node.js 26 LTS Generally Available on Vercel with HTTP/2 Default and V8 14.6

·2026.10.29 09:00

Key point

The release makes Node.js 26 the default for new projects and automatically upgrades existing projects with compatible engines.node settings.

Details

  • Node.js 26 LTS is generally available for builds and Vercel Functions, becoming the default for all new projects.
  • HTTP/2 is enabled by default for built-in fetch via Undici 8, allowing multiple requests to share a connection to reduce latency for API and database calls.
  • V8 version 14.6 is included, adding features like Map.prototype.getOrInsert() and the Temporal API for immutable date values with built-in time zone support.
  • Existing projects with engines.node allowing version 26 (e.g., >=20) will automatically use Node.js 26 on the next deployment, while manual upgrades require setting engines.node to 26.x.
  • Prebuilt deployments of Node.js 26 Functions require Vercel CLI version 65.8.0 or later, and HTTP/1.1 can be retained by setting the VERCEL_FETCH_DISABLE_H2 environment variable to 1.
vercelltsnode.jshttp/2v8undici
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