# Changelog

## Changelog, page 42

12 May12 May

- ## Node.js 26.x now available on Vercel Sandboxes

    You can now create a sandbox from the Vercel Node 26 runtime, providing the latest node.js features in the current major version

    Andy WallerSoftware Engineer

    [Learn more](/changelog/node-js-26-x-now-available-on-vercel-sandboxes)

11 May11 May

- ## Automate progressive rollouts with Vercel Flags

    You can now automate time-based traffic movement for Vercel Flags using progressive rollouts. Unlike weighted splits which maintain stable traffic distribution for experiments, progressive rollouts automatically advance through a predefined...

    Dominik Ferber, Chris Widmaier

    [Learn more](/changelog/progressive-rollouts-in-vercel-flags)

- ## Vercel Sandbox firewall now supports request proxying and filtering

    The Vercel Sandbox firewall now supports forwarding specific requests to a proxy. This can be useful to log, debug, or transform HTTP requests or responses initiated from a sandbox.

    Tom Lienard, Valerian Roche, and 1 other

    [Learn more](/changelog/vercel-sandbox-firewall-now-supports-request-proxying-and-filtering)

8 May8 May

- ## Chat SDK adds Messenger adapter support

    Chat SDK now supports Messenger, extending its single-codebase approach to Slack, Discord, GitHub, Teams, and Telegram with the new Messenger adapter.

    Ben Sabic, Vishal Yathish

    [Learn more](/changelog/chat-sdk-adds-messenger-adapter)

- ## Chat SDK adds web adapter support

    Chat SDK now supports browser chat UIs. Bring your bot to a React app via useChat, with the same handlers that fire on Slack, Discord, and Teams.

    Ben Sabic, Josh Singh

    [Learn more](/changelog/chat-sdk-adds-web-adapter-support)

- ## Chat SDK now supports conversation history

    Persist per-user message history that follows the same person across every Chat SDK adapter, with the new transcripts and identity options.

    Ben Sabic, Josh Singh

    [Learn more](/changelog/chat-sdk-conversation-history)

7 May7 May

- ## Next.js May 2026 security release

    Next.js 15.5.18 and 16.2.6 patch 13 security advisories covering middleware bypass, denial of service, SSRF, cache poisoning, and cross-site scripting.

    Jimmy LaiHead of Next.js

    [Learn more](/changelog/next-js-may-2026-security-release)

- ## Vercel Flags now supports JSON values

    Vercel Flags now supports JSON types alongside boolean, string, and number values. Store structured configuration data directly in feature flags without additional database lookups.

    [Learn more](/changelog/vercel-flags-now-supports-json-values)