changelog

Author: AndrewMusgrave

UNRELEASED-V4.md

@@ -38,6 +38,7 @@ Use [the changelog guidelines](https://git.io/polaris-changelog-guidelines) to f
 
 ### Dependency upgrades
 
+- Added `@material-ui/react-transition-group` and removed `react-transition-group` to support `React.StrictMode` ([#1759](https://github.com/Shopify/polaris-react/pull/1759))
 - Added `@shopify/react-testing` ([#1596](https://github.com/Shopify/polaris-react/pull/1596))
 - Removed`@shopify/css-utilities` ([#1586](https://github.com/Shopify/polaris-react/pull/1586))
 - Removed `@types/prop-types` and `prop-types` ([#1505](https://github.com/Shopify/polaris-react/pull/1505))