https://wccftech.com/download-ios-13-5-beta-3-with-first-version-of-covid-19-exposure-notification-api/

Apple has seen fit to release a new beta of its iOS 13.5 operating system that comes with the first version of its COVID-19 contact tracing exposure notification API. If you're a developer, you can download the beta from the Apple Developer Center right now. In addition to this, you also have the availability of Xcode 11.5. The Xcode features an updated iOS SDK that integrates the exposure notification API.

iOS 13.4.5 has been updated to version iOS 13.5 to include the code which is necessary to run the first apps built with respect to the exposure notification API. Apple and Google announced the partnership a few weeks ago and the tool will allow authorities to develop apps via Bluetooth-based contact tracing technology.