Apple rolled out the first of its kind Rapid Security Response update — quick fixes automatically installed on iPhones, iPads, and iMacs in-between software updates.

On May 1, devices with default settings were updated with iOS 16.4.1, iPadOS 16.4.1, or macOS Ventura 13.3.1, according to the company’s notice to users, which contained few details. Rapid Response fixes are designated with a letter after the software version software number, Apple added — macOS 13.3.1 (a) will be listed on updated Macs, for instance.