# update(_:) Updates the dynamic content of the Live Activity. ``` func update(_ content: ActivityContent.ContentState>) 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. ## Discussion Use this function to update the Live Activity while your app is in the foreground or while it’s in the background — for example, by using . > Note: The system ignores attempts to update a Live Activity that ended. --- 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)