MacRumors published a story that Apple has released the first beta of iOS and iPadOS 13.4.5 to registered developers.
Apple Seeds First Beta of iOS and iPadOS 13.4.5 to Developers
Apple today seeded the first betas of upcoming iOS and iPadOS 13.4.5 updates to developers, one week after releasing iOS and iPadOS 13.4 with iCloud Folder Sharing, iPad trackpad support, and more.
Apple Seeds First Beta of iOS and iPadOS 13.4.5 to Developers