> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-013b37f0.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Upgrading From V3

Upgrading from v3.x to v4 is fairly simple. Below are the major changes that are released as a part of CometChat v4:

Please follow the [Setup](/sdk/flutter/setup) instructions to upgrade to the latest V4 version.

## Chat Import Change

Remove all the imports of CometChat Flutter v3 SDK or replace it with single import statement

<Tabs>
  <Tab title="Dart">
    ```dart theme={null}
    import 'package:cometchat_sdk/cometchat_sdk.dart';
    ```
  </Tab>
</Tabs>

## Calling Import Change

Remove all the imports of CometChat Flutter v3 SDK or replace it with single import statement

<Tabs>
  <Tab title="Dart">
    ```dart theme={null}
    import 'package:cometchat_calls_sdk/cometchat_calls_sdk.dart';
    ```
  </Tab>
</Tabs>