Apple on Monday updated macOS Sierra to 10.12.3, patching 11 security vulnerabilities and addressing a graphics hardware problem in the latest 15-in. MacBook Pro laptop.

At the same time, Apple released iOS 10.2.1, an update that fixed 18 security flaws, the bulk of them in WebKit, the foundation of the baked-in Safari browser.

According to Apple’s typically terse update documentation, macOS 10.12.3 “improves automatic graphics switching on MacBook Pro (15-in., October 2016).” Another fix addressed “graphics issues” on both the 15-in. and the smaller 13-in. sibling when encoding in Adobe Premiere Pro; that bug attracted attention after a video showing a notebook wildly cycling through colors went viral.

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Apple quashes bugs in iOS, macOS and Safari