TikTok is building a new version of its app for users in the U.S. ahead of a planned sale of the app to a group of investors.

The company has developed a plan to launch the new TikTok app, known internally as “M2,” to U.S. app stores on September 5, according to two people with knowledge of the matter. (The existing TikTok app is known internally as “M.”) Under the plan, TikTok users will eventually have to download the new app to be able to continue using the service, although the existing app will work until March of next year.