# 3.x -> 3.3

Version 3.3 of the Customer.io Expo plugin adds support for App Groups, improving push delivery metric tracking on iOS.

## What changed?[](#what-changed)

Version 3.3 introduces the `appGroupId` configuration option, which enables [App Groups](/integrations/sdk/expo/push-notifications/app-groups/) for reliable push delivery metric tracking on iOS.

This update also requires `customerio-reactnative` version 6.4.0 or later as a peer dependency.

## Do you need to update to this version?[](#do-you-need-to-update-to-this-version)

This update is additive—your existing integration works without changes. We recommend updating if you want to improve the reliability of push delivery metric tracking on iOS.

## Update process[](#update-process)

### 1\. Update the plugin version[](#1-update-the-plugin-version)

Update your `package.json` to use version 3.3 or later:

```bash
npm install customerio-expo-plugin@3.3 customerio-reactnative@6.4.0
# or
yarn add customerio-expo-plugin@3.3 customerio-reactnative@6.4.0
```

### 2\. Configure App Groups[](#2-configure-app-groups)

To take advantage of the new App Groups support, add `appGroupId` to your plugin configuration. See [App Groups for push tracking](/integrations/sdk/expo/push-notifications/app-groups/) for setup instructions.

### 3\. Rebuild your app[](#3-rebuild-your-app)

After updating the plugin, rebuild your app:

```bash
npx expo prebuild --clean
npx expo run:ios
```