https://wccftech.com/apple-seeds-beta-4-of-ios-13-5-ipados-13-5-tvos-13-4-5-watchos-6-2-5-to-developers/

Today, Apple has seen fit to release the fourth beta of its upcoming iOS 13.5, tvOS 13.4.5, and watchOS 6.2.5 to developers for testing purposes. The new beta builds arrive a week after the third beta was released. If you're a developer, you can download beta 4 from the Apple Developer Center.

Starting off with iOS 13.4 beta 4, it can be downloaded over-the-air or through the Apple Developer Center. Be sure to note that a proper configuration profile is required. iOS 13.5 introduces the new exposure notification API designed by Apple and Google. The API allows public health authorities to create COVID-19 tracing apps in order to prevent the spread of the coronavirus. The update will also add a toggle in the Settings which will allow you to opt-out of the exposure notifications. Other than this, the update will also bring bug fixes and performance enhancements to the table.