Using Theia 1.21 getting below error

Root ERROR Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it’s running React 17. Learn more: How to Upgrade to React 18 – React

@gauravthorath We don’t support any version except for the latest (currently 1.43.1) and our current community release (1.40.1 - but will change to 1.43.1 at the end of the month).

I assume using those versions will fix the behavior, since we’ve been using React 18 in our framework for a few months now.