Update changelog and package version for 2.21.0 release

Author: VeskeR

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 This contains only the most important and/or user-facing changes; for a full changelog, see the commit history.
 
+## [2.21.0](https://github.com/ably/ably-js/tree/2.21.0) (2026-03-19)
+
+### New features
+
+- Add LiveObjects REST client: `channel.object` is now available on REST channel instances, exposing `get()` to read object state, `publish()` to send object operations, and `generateObjectId()` to create object IDs on the client side for atomic batch operations with cross-references between newly created objects [#2109](https://github.com/ably/ably-js/pull/2109)
+
 ## [2.20.0](https://github.com/ably/ably-js/tree/2.20.0) (2026-03-13)
 
 With this release, the ably-js LiveObjects API is no longer in Public Preview and is now generally available.

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "ably",
   "description": "Realtime client library for Ably, the realtime messaging service",
-  "version": "2.20.0",
+  "version": "2.21.0",
   "license": "Apache-2.0",
   "bugs": {
     "url": "https://github.com/ably/ably-js/issues",

package.json

@@ -12,7 +12,7 @@ export type ChannelNameAndOptions = {
 export type ChannelNameAndAblyId = Pick<ChannelNameAndOptions, 'channelName' | 'ablyId'>;
 export type ChannelParameters = string | ChannelNameAndOptions;
 
-export const version = '2.20.0';
+export const version = '2.21.0';
 
 /**
  * channel options for react-hooks