MacRumors published a story that Apple has released the fifth Beta of macOS Big Sur 11.5 to registered developers.
Apple Seeds Fifth Beta of macOS Big Sur 11.5 to Developers
Apple today seeded the fifth beta of an upcoming macOS Big Sur 11.5 update to developers for testing purposes, with the new beta coming two weeks after the release of the fourth macOS Big Sur 11.5 beta.
Apple Seeds Fifth Beta of macOS Big Sur 11.5 to Developers
Developers can download the macOS Big Sur 11.5 beta using the Software Update mechanism in System Preferences after installing the proper profile from the Apple Developer Center.