Apple Releases macOS High Sierra Golden Master Candidate to Developers and Public Beta Testers

Apple today seeded a golden master (GM) candidate of macOS High Sierra to developers and public beta testers after nine rounds of betas. The golden master represents the final version of macOS High Sierra that will be released to the public on Monday, September 25, should no additional bugs be found.

The macOS High Sierra golden master can be downloaded from the Apple Developer Center or over-the-air using the Software Update mechanism in the Mac App Store.

macOS High Sierra is designed to build on features first introduced in the macOS Sierra update in 2016, focusing primarily on new storage, video, and graphics technology. The update brings a new Apple File System (APFS), High Efficiency Video Codec (HEVC), new HEIF image encoding, and an updated version of Metal with support for VR and external GPUs.


Multiple apps have been updated with new capabilities in macOS High Sierra. Photos features a new sidebar to make it easier to access editing tools and albums, and there are new filters and editing options like Curves and Selective Color.

Safari is gaining speed enhancements, an option to prevent autoplay videos, and a privacy feature aimed at cutting down on cross-site data tracking. Siri in macOS High Sierra has a new, more natural voice, and Spotlight offers flight status information. iCloud, FaceTime, Notes, and Mail also include useful new features.

Apple plans to release macOS High Sierra to the public on Monday, September 25. macOS High Sierra will run on all machines that are compatible with macOS Sierra.

For a complete overview of changes coming in macOS High Sierra, make sure to check out our macOS High Sierra roundup.

Related Forum: macOS High Sierra

Top Rated Comments

xmonkey Avatar
84 months ago
Least anticipated Mac OS version ever
You kidding? eGPU support and Apple File System support make this easily one of the better releases in awhile.
Score: 30 Votes (Like | Disagree)
nutmac Avatar
84 months ago
Due to the 32 bit cutoff, I might wait this one out. Don’t feel like upgrading Microsoft office since I don’t use it often; and I have a bunch of old projects in FCP 7 still that I haven’t moved up to 10.
macOS High Sierra runs 32-bit apps just fine (you are probably thinking of iOS 11). Apple has only stated that Mac App Store will stop carrying 32-bit apps early next year.
Score: 8 Votes (Like | Disagree)
Aluminum213 Avatar
84 months ago
Least anticipated Mac OS version ever
Score: 8 Votes (Like | Disagree)
john123 Avatar
84 months ago
Who's quality is worse yours or Apples? "macOS High Sierra that will be released to the public on Monday, September 25 ... Apple plans to release macOS High Sierra to the public on Tuesday, September 19"
You mean "whose"....
Score: 7 Votes (Like | Disagree)
MikhailT Avatar
84 months ago
Build number of the GM build is 17A362a.
Score: 6 Votes (Like | Disagree)
noraa Avatar
84 months ago
Been using High Sierra since the first DP beta, and it's been pretty good so far. The early builds were definitely rough around the edges (to be expected), but the past few builds have been relatively stable. I've noticed a few issues, mainly with iTunes and Photos. When I have iTunes open the computer can slow to a crawl - but not always. I haven't tested it since the 12.7 release of iTunes, so that might help. Photos is just buggy as hell. I have a relatively large photos library (167.7 GB, 18000+ photos and videos, mostly photos), but had few issues under Sierra. There were periods when it would slow down some, but usually when I was importing a bunch of photos while editing existing photos and what not. In High Sierra it can run really slow all the time, in full screen mode I get weird screen artifacts (like a white bar on top, where the toolbar should be - until I mouse over it and the toolbar appears), can crash a lot - typically I get the spinning beach ball of death and have to force quit. I've reported the various issues to Apple, and while Photos has definitely become more stable since DP1, it's still buggy. I'm actually really excited about some of the additional editing features in Photos - will require less use of 3rd party extensions - but at the moment it is rather annoying to use. Hopefully, though, these issues can get ironed out before public release (haven't had a chance to install this GM candidate to test it out).

My biggest cause for concern, however, is APFS. I'm currently running APFS on both my MacBook Pro with dedicated flash storage, and my iMac with a fusion drive. High Sierra automatically updated my MBP to APFS, but did not updated the fusion drive. In fact, I could even manually convert the fusion drive to APFS - I actually wiped my machine completely, recreated the fusion drive and formatted it as APFS (so obviously APFS works with a fusion drive). So far it seems to be running just fine - and there are some obvious benefits to it already. I had a major issue in a recent build that prevented my iMac from booting, I figured I'd have to just restore from a Time Machine backup. Fortunately, because of APFS, Time Machine creates local snapshots on the internal hard drive, and I was able to restore to one of those snapshots prior to the issue I had. It was easy, fast, and actually worked (unlike a similar feature in Windows allowing you to restore the system to a previous point if you're having issues, which rarely works to resolve the issue). With that being said, and speaking of Time Machine backups, external Time Machine backups still need to be formatted as HFS+. It thus appears that at the moment, external Time Machine backups gain no benefit from the new features in APFS (specifically the aforementioned snapshots). I'm sure this will change at some point down the road...but who knows when. Which brings me to my biggest concern about APFS, there's just not a lot out there about it. Apple has published a number of different documents delving into some of the features and specifications about APFS, but there are still a lot of unknowns. The fact that there is no mention of external Time Machine backups in the documents (only local backups are mentioned) and that a lot of API's haven't been published (snapshots, clones, etc) just has me leery, it feels like APFS is still in beta stages. This wouldn't necessarily be an issue, but any machine running just flash (no fusion drive) will be automatically upgraded to APFS, with no option to NOT be upgraded. Hopefully when the final release is available Apple will publish more info on APFS.
Score: 6 Votes (Like | Disagree)

Popular Stories

Apple car wheel icon feature yellow

Apple Cancels Electric Car Project

Tuesday February 27, 2024 11:05 am PST by
Apple has canceled all plans to release an autonomous, electric vehicle, reports Bloomberg. Apple has been working on an Apple Car for more than a decade and invested millions of dollars into development before deciding it was not a viable project. Apple's Chief Operating Officer Jeff Williams today told approximately 2,000 employees working on the Apple Car that the project was canceled,...
iOS 18 Mock iPhone 16 Feature Gray

iOS 18 Rumored to Be Compatible With These iPhone Models

Tuesday February 27, 2024 6:31 am PST by
iOS 18 will be compatible with the iPhone XR, and thereby also the iPhone XS and iPhone XS Max models with the same A12 Bionic chip, according to a post on X today from a private account with a proven track record of sharing build numbers for upcoming iOS updates. The post was spotted by MacRumors contributor Aaron Perris, and it has since been deleted. However, this was likely because the...
Google maps feaure

Google Maps Finally Rolls Out Glanceable Directions

Wednesday February 28, 2024 2:07 am PST by
After more than a year since announcing the feature, Google Maps is finally rolling out glanceable directions on Android and iOS (via Android Police). The feature allows users to view turn-by-turn directions and a live ETA directly from their device's lock screen – information that was previously only visible when a phone was unlocked. Glanceable directions also work on the app's route...
iPad Air 5

iPadOS 18 Rumored to Drop Support for These iPad Models

Tuesday February 27, 2024 6:55 am PST by
iPadOS 18 will drop support for iPad models equipped with the A10X Fusion chip, according to a post on X today from a private account with a proven track record of sharing build numbers for upcoming iOS and iPadOS updates. This means that iPadOS 18 would not be compatible with the first-generation 10.5-inch iPad Pro or the second-generation 12.9-inch iPad Pro models released in 2017. It...
iOS 17

iOS 17.4 Coming Soon With These New Features for Your iPhone

Monday February 26, 2024 6:08 am PST by
In a press release last month, Apple confirmed that iOS 17.4 will be released in March, and the update includes several new features and changes for the iPhone. Key new features in iOS 17.4 include major App Store changes in the EU, Apple Podcasts transcripts, and an iMessage security upgrade. The update also adds new emoji and includes preparations for the launch of next-generation CarPlay...
M3 MacBook Air Feature

New MacBook Air Models Launching Next Month: 5 Features to Expect

Wednesday February 28, 2024 1:50 am PST by
The existing 15-inch MacBook Air arrived in June 2023, which is not that long ago in terms of Mac update cycles. However, Apple released the current 13-inch ‌MacBook Air back in June 2022. It is now the oldest Mac in Apple's current crop, having not been updated in 600 days. But rumors suggest that is unlikely to be the case for much longer. According to Bloomberg's Mark Gurman, Apple has...
iOS 17

10 New Things Your iPhone Can Do in Next Month's iOS 17.4 Update

Tuesday February 27, 2024 8:18 am PST by
Apple will next month release iOS 17.4, its biggest iPhone software update of the year so far, featuring a number of features and changes that users have been anticipating for quite a while. Below, we've listed 10 new things that your iPhone will be able to do after you've installed the update, which is projected to arrive by March 7. When the day arrives, be sure to check Settings ➝...