Apple Seeds Third Beta of macOS Sierra 10.12.3 to Developers - MacRumorsOpen MenuShow RoundupsShow Forums menuVisit ForumsOpen Sidebar
Skip to Content

Apple Seeds Third Beta of macOS Sierra 10.12.3 to Developers

by

Apple today seeded the third beta of an upcoming macOS Sierra 10.12.3 update to developers, three weeks after seeding the second 10.12.3 beta and almost a month after releasing macOS Sierra 10.12.2, the second update to the macOS Sierra operating system.

The macOS Sierra 10.12.3 update is available for download through the Apple Developer Center or through the software update mechanism in the Mac App Store.

macos-10-12-3-beta
According to Apple's release notes, the 10.12.3 update "improves the stability, compatibility, and security of your Mac." No specific changes, bug fixes, or feature additions were discovered in the first two betas, but we'll update this post should any new features be found in the third beta.

Oftentimes, with bug fixes, it's hard to tell what's included until Apple supplies detailed release notes with a release. The previous update, macOS 10.12.2, introduced several important bug fixes to resolve battery life issues, fix graphics problems, and more.

Available since September, macOS Sierra is the latest Mac operating system. It includes Siri support, Apple Pay for the web, Universal Clipboard, Apple Watch auto unlocking, improved iCloud Drive integration, Picture-in-Picture multitasking, and dozens of smaller features that can be found in our macOS Sierra roundup.

Update: The third public beta is also available.

Related Forum: macOS Sierra

Popular Stories

iOS 27 Next to iPhone

Here's When iOS 27 Rolls Out Today in Every Time Zone [Update: It's Out]

Sunday September 13, 2026 3:00 am PDT by
Update 10:04 a.m.: iOS 27 is rolling out now, though it may take a bit for all users to see it, so keep checking! Apple is about to release iOS 27, which will finally deliver more advanced Siri AI capabilities as well as a variety of other refinements, improvements, and new features to iPhones. It's Apple's biggest software update of the year, and Apple announced at Wednesday's iPhone event...
Read Full Article • 151 comments
iOS 27 Icon iPhone

iOS 27 Available Now With These 8 New Features

Monday September 14, 2026 9:00 am PDT by
Update — 10 a.m. Pacific Time: Apple has released iOS 27. During its iPhone 18 Pro and iPhone Duo event last week, Apple announced that iOS 27 will be released widely on Monday, September 14. iOS 27 should be available around 10 a.m. Pacific Time / 1 p.m. Eastern Time today via the Settings app, under General → Software Update. Below, we have highlighted eight new features and...
Read Full Article • 111 comments
Apple iCloud Plus expansion hero

iCloud+ Now Includes Apple TV, Apple Arcade, and Curated Apple Music Stations in Over 100 Countries

Tuesday September 15, 2026 1:43 am PDT by
Apple today announced a new subscription initiative that turns paid iCloud+ subscriptions into a broader services bundle in more than 100 countries. In select countries, Apple says every paid iCloud+ plan, including the cheapest 50GB tier, now includes Apple TV and Apple Arcade "at no additional cost," while family sharing extends the storage, TV and Arcade access to up to five people....
Read Full Article • 102 comments

Top Rated Comments

magicschoolbus Avatar
magicschoolbus
126 months ago
Bring back the estimated time left on the battery.. the removal of that was such a troll move by Apple.
Score: 8 Votes (Like | Disagree)
justperry Avatar
justperry
126 months ago
Version 16D25a


Edit: Seems like all AMD drivers have been updated, Modification Date on all is 06-01-2017.

Edit 2: Dug a bit deeper, all Graphic Drivers are updated, including AMD, Intel and Geforce.
Score: 7 Votes (Like | Disagree)
Guy Clark Avatar
Guy Clark
126 months ago
Cue the normal whining regarding stability. Those who signed up to the Beta programme only have themselves to blame if their system is unstable.

Me I don't run a new release of OS X (macOS) until the .4 release hence the reason I am still running OS X 10.11.6 El Capitan.

Stability is no trade off for new features.
Score: 4 Votes (Like | Disagree)
B
bt22
126 months ago
Allow Siri to control my Philips Hue lights via my Mac. Also hurry up and come out with a device to compete with Amazon Alexa and Google Home
Score: 3 Votes (Like | Disagree)
A
Altis
126 months ago
Beta train! Chugga-chugga-chugga-chugga, woot! Woot!

(I can't install the beta anymore after reinstalling macOS from scratch last week. The beta enablement tool on developer.apple.com doesn't appear to work for some reason.)
That's why Sierra itself feels like it's a beta.
Score: 3 Votes (Like | Disagree)
duervo Avatar
duervo
126 months ago
Beta train! Chugga-chugga-chugga-chugga, woot! Woot!

(I can't install the beta anymore after reinstalling macOS from scratch last week. The beta enablement tool on developer.apple.com doesn't appear to work for some reason.)
Score: 3 Votes (Like | Disagree)
Read All Comments

🔗 Related Apple News & Rumors

Stay updated with the latest Apple ecosystem news and verified rumors