# update(_:alertConfiguration:timestamp:) Updates the dynamic content of a Live Activity and alerts a person about the Live Activity update. ``` func update(_ content: ActivityContent.ContentState>, alertConfiguration: AlertConfiguration? = nil, timestamp: Date) async ``` ## Parameters `content` The updated dynamic content for the Live Activity. The size of its [`state`](/documentation/ActivityKit/ActivityContent/state) property can’t exceed 4KB in size. `alertConfiguration` The alert configuration you use to configure how the system notifies a person about the updated content of the Live Activity. `timestamp` The time the data in the payload was generated. If this is older than a previous update or push payload, the system ignores this update. ## Discussion The system ignores updates to a Live Activity that’s in the [`ActivityState.ended`](/documentation/ActivityKit/ActivityState/ended) state. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)