Apple Seeds Second Beta of macOS High Sierra to Public Beta Testers - MacRumors
Skip to Content

Apple Seeds Second Beta of macOS High Sierra to Public Beta Testers

Apple today seeded the second public beta of an upcoming macOS High Sierra update to public beta testers, two weeks after releasing the first public beta. The second public beta of macOS High Sierra corresponds with the third developer beta, provided to developers earlier this week.

Beta testers who have signed up for Apple's beta testing program are able to download the second macOS High Sierra beta through the Software Update mechanism in the Mac App Store after the proper profile has been installed.

macos hs beta
Those who want to be a part of Apple's beta testing program can sign up to participate through the beta testing website, which gives users access to iOS, macOS, and tvOS betas. For instructions on how to install the public beta, check out our how to, and make sure to make a backup before giving the software a try. Don't install the beta on a main machine, as betas are notoriously unstable. High Sierra runs on all machines that support Sierra.

The macOS High Sierra update is designed to improve and refine the existing macOS Sierra operating system. Along with a new, more efficient file system (APFS) designed for modern storage, the update introduces Metal 2, the next-generation version of Apple's Metal graphics API with support for machine learning, external GPUs, and VR content creation.


High Efficiency Video Encoding (HEVC aka H.265) is coming in High Sierra, and many of the existing apps are being updated. Photos features a new persistent side view and editing tools for Curves, Selective Color, and Live Photos, while Siri is gaining a more natural voice and support for more music-related commands.

Safari offers a new autoplay blocking feature for videos and Intelligent Tracking Prevention to protect your privacy, while Mail storage is being optimized to take up 35 percent less space. iMessages can now be stored in iCloud, and there are new iCloud Drive file sharing options and new iCloud storage family plans.

For a full overview of the new features you can expect to see when macOS High Sierra is released in the fall, make sure to check out our full macOS High Sierra roundup.

Related Forum: macOS High Sierra

Popular Stories

Dynamic Island iPhone 18 Pro Feature

11 Reasons to Wait for the iPhone 18 Pro

Monday May 11, 2026 9:01 am PDT by
We're only four months out from the launch of Apple's premium next-generation smartphone lineup, and while we're not expecting a sea change in terms of functionality, there are still several enhancements rumored to be coming to the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth noting is that Apple is reportedly planning a major change to its iPhone release cycle this year, adopting a...
iOS 26

iOS 26.5 Features: Everything New in iOS 26.5

Monday May 11, 2026 5:09 pm PDT by
Apple released iOS 26.5 after a few months of beta testing, and while it doesn't have the Siri features we were hoping for since those are being held until iOS 27, there are a handful of useful changes worth knowing about. Subscribe to the MacRumors YouTube channel for more videos. End-to-End Encryption for RCS Support for end-to-end encryption (E2EE) for RCS messages between iPhone and...
General Apps Reddit Feature

Reddit Starts Blocking Mobile Website, Pushing Users to App Instead

Monday May 11, 2026 6:10 am PDT by
Social network Reddit recently began blocking mobile visitors to its website while pushing them to download the official Reddit app, and it's fair to say that the move is not going down well with users. If you visit reddit.com on your iPhone today, you may see a new popup that can't be dismissed, asking you to "get the app to keep using Reddit." A Reddit spokesperson told Ars Technica...

Top Rated Comments

115 months ago
Tons of issues with the first PB, hope this improves functionality / performance. It needs it.
Score: 6 Votes (Like | Disagree)
Icaras Avatar
115 months ago
Does anyone know if its safe to upgrade to APFS on a 1TB Apple-made fusion drive in this PB?
Score: 5 Votes (Like | Disagree)
PBG4 Dude Avatar
115 months ago
Reading some of these posts it sounds like people are running High Sierra on their main partition vs secondary partition or external drive. Why would one need to run a Time Machine backup on a partition with just High Sierra and whatever one is testing?
Score: 4 Votes (Like | Disagree)
115 months ago
Yea I downloaded the entire thing from beta.apple.com. No luck.



I did everything you did. Quit all apps, disconnected all peripherals, and even tried installing it from safe mode. Same result, every time. This sucks.
Add one more to the pile! I even did a clean install of Sierra, and it still won't install it.

If anyone figures this out, please share!

I've looked all over the webs for a possible answer, and no luck...anyone else?
Score: 2 Votes (Like | Disagree)
fisherking Avatar
115 months ago
BY FAR the WORST BUILD EVER
The first public beta build was workable, 10.13 Beta (17A306f) is plagued with bugs. If you are thinking about public beta testing - skip this version. I can't keep up with all the bug reporting.
Some issues I'm having is Fan running all the time (iMac 27-inch, Late 2012) 3.4 GHz Intel Core i7 32 GB 1600 MHz DDR3 NVIDIA GeForce GTX 680MX 2 GB)
Bubbles appear while completing forms on safari
Flickering Safar preferences
copy and paste not always working ctrl C
computer becomes unresponsive for seconds
Try it if you'd like, but I would recommend skipping this version.
[doublepost=1499892145][/doublepost]
Yes, and airdrop isn't working properly.
So many more bugs. I've already sent in 4 and haven't sent in photos not importing from iPhone.
[doublepost=1499892213][/doublepost]
M is last weeks. F is today's. Don't do it, it is a big fail and you'll never get any work done.
not having any of those problems; PB2 is running much better here than PB1 in most respects. try re-installing the beta...
Score: 2 Votes (Like | Disagree)
pawel_z_wrocka Avatar
115 months ago
You know what? I will find a bug report, maybe they will take notice.

This version is better in some ways, e.g. it lets my MB sleep now, instead of shutting it down, but, on the other hand, it has broken Photos...
Score: 1 Votes (Like | Disagree)