---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/flex/developer/flex-sdk/changelog#article
headline: "Changelog: Twilio Flex SDK JavaScript"
description: View changelog links, version history, and release documentation for the Twilio Flex SDK.
url: https://www.twilio.com/docs/flex/developer/flex-sdk/changelog
inLanguage: en
dateModified: 2026-07-30T12:56:13.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# Changelog: Twilio Flex SDK JavaScript

* Latest release [documentation](https://sdk.twilio.com/js/flex-sdk/latest/docs/).

## Changelog

### Flex SDK 4.2.0 *(July 30, 2026)*

* [npm](https://www.npmjs.com/package/@twilio/flex-sdk/v/4.2.0) Flex SDK JS package.
* [API Docs](https://sdk.twilio.com/js/flex-sdk/releases/4.2.0/docs) JS SDK API documentation.
* [Storybook](https://sdk.twilio.com/js/flex-sdk/releases/4.2.0/storybook) Storybook app.

#### Changes

* New `client.connectionState` getter and `ClientEvent.ConnectionStateChanged` event, reporting an aggregate connection state across the network and all initialized SDKs (Conversations, Voice, TaskRouter)

### Flex SDK 4.1.0 *(July 20, 2026)*

* [npm](https://www.npmjs.com/package/@twilio/flex-sdk/v/4.1.0) Flex SDK JS package.
* [API Docs](https://sdk.twilio.com/js/flex-sdk/releases/4.1.0/docs) JS SDK API documentation.
* [Storybook](https://sdk.twilio.com/js/flex-sdk/releases/4.1.0/storybook) Storybook app.

#### Changes

* New `GetChannelsForTask` action to retrieve the channels associated with a task
* New `GetContentTemplates` action to retrieve content templates
* New `CoachCall` and `BargeCall` supervisor actions, building on `MonitorCall`
* Bumped `ws` dependency to `^8.20.1`

**Bug fixes**

* `AcceptTask` now waits for the voice task to reach the accepted status before returning (previously returned once the reservation was assigned)

### Flex SDK 4.0.0 *(March 26, 2026)*

* [npm](https://www.npmjs.com/package/@twilio/flex-sdk/v/4.0.0) Flex SDK JS package.
* [API Docs](https://sdk.twilio.com/js/flex-sdk/releases/4.0.0/docs) JS SDK API documentation.
* [Storybook](https://sdk.twilio.com/js/flex-sdk/releases/4.0.0/storybook) Storybook app.

Flex SDK is Generally Available