IOS 16.5 has been in beta testing since late March and is shaping up to be a minor software update ahead of Apple announcing iOS 17 at WWDC in June.
In a tweet today, the account said the upcoming iOS 16.5 Release Candidate for developers will have a build number of 20F65. Apple will likely release iOS 16.5 to the public next week, based on a protected Twitter account that has shared build numbers for several iOS updates up to a week before they were released.
