Apple today seeded the fourth beta of an upcoming macOS High Sierra 10.13.3 update to developers, one week after seeding the third beta and more than a month after releasing macOS High Sierra 10.13.2, the second major update to the macOS High Sierra operating system.

The new macOS High Sierra 10.13.3 beta can be downloaded from the Apple Developer Center or through the Software Update mechanism in the Mac App Store with the proper profile installed.

macoshighsierra10133beta
It's not yet clear what improvements the third update to macOS High Sierra will bring, but it's likely to include bug fixes and performance improvements for issues that weren't addressed in macOS High Sierra 10.13.2.

The previous macOS High Sierra 10.13.2 update focused solely on security fixes and performance improvements, with no new features introduced.

Update: Apple has also seeded a new public beta of macOS High Sierra 10.13.3 to public beta testers.

Related Forum: macOS High Sierra

Top Rated Comments

Ener Ji Avatar
103 months ago
I hope it fixes the bugs especially about the Finder and Spotlight etc. in HS. Otherwise all this big talk of it being like a SL release will be a plain ******** from Craig Federighi.
I imagine that was the goal, but the challenge of a fixed release schedule (aligned with the new iPhone models) was too great to overcome this year. I can picture them planning out the release schedule and having just enough time to meet their quality goals, and then being hit with unexpected bugs (including "drop everything and fix" security vulnerabilities) compressed their schedule so much that they were forced to de-prioritize more bugs than normal.

Aside from the latest major security vulnerabilities that may require continued tinkering to the existing patches and / or firmware updates, still needs to work out the remaining kinks in APFS (Fusion drives, anyone?), external GPU and VR support is supposed to be end-user "ready" in Q2, iMessage in iCloud was promised last year, and there's probably much more I'm forgetting.

Apple had to recently support the iMac Pro, and if there are any planned Mac hardware refreshes in the Spring, the software engineering group is likely already working to make sure those new products are properly supported. All these efforts reduce the resources available to focus on polish and the remaining quality-of-life bugs and issues in HS.

For all those reasons, I am continuing to hold off on upgrading to High Sierra. My ideal situation would be to upgrade once there are a couple of point releases that are extremely boring in nature, i.e. no new features or major changes. That would indicate to me that a lot of 'behind-the-scenes' bugs are finally being squashed.
Score: 4 Votes (Like | Disagree)
westislander Avatar
103 months ago
Just curious why these MacOS beta update reports are no longer being posted on the front page but instead been relegated to Mac blog section
Score: 4 Votes (Like | Disagree)
ScooterComputer Avatar
103 months ago
If Microsoft can move to twice-yearly OS updates, why can't Apple sustain yearly releases? If Apple is struggling to maintain software quality, then perhaps they simply need to push features which aren't ready into a subsequent release.
Because Microsoft has smartly moved their releases to actually not be "monolithic" releases. The Creators Update and Fall Creators update were effectively similar to macOS old "major-minor" point revisions, from like 10.5 to 10.6, rather than the MAJOR point revisions macOS is suffering under now. Microsoft did a significant amount of under-the-covers engineering going into Windows 10; Apple has (obviously) been breaking a lot of stuff down below the app layer for the last few years. Which goes to my point: Apple needs to lock down 10.13, make that the "base"; get the graphics stuff working, the USB working, SOLID. Then LTS that, and iterate above it. Windows 10 is now on 2 years in on roughly a LTS foundation, and getting better as it goes. macOS on the other hand has been struggling for 3 1/2 years (since around 10.10, I'd say; 10.9.0/.1 weren't great, but by .3/.5/.6 they cleaned it up). 10.12.3 was relatively solid, but 10.12 wasn't. And by the time users found partial "stability" in 10.12.5, Apple was already right back to breaking things in 10.13. Worse, they didn't fix a lot of things 10.12 had broken (PDFKit, IOKit).

I don't think this is a "features" problem, I think it is a "marriage" problem. By forcing the development cycle to marry both the Operating System and the Userland (the Apps and Services on top of that OS), Apple is finding that both are suffering, badly. There should be no reason that a well-engineered LTS OS can't support iterative new "features". Certainly Windows 10 and Linux prove there IS a better way!

(And perhaps I've gone and said it: "well-engineered". Being an engineer, seeing what I see, it is my personal belief that "Design" has taken FAR too large a role at Apple. It is an ages-old discussion, almost a "philosophical discussion", about the roles of Design, Engineering, and Architecture in software/OS development. Apple pretty clearly has banked a PR/marketing reputation on "Design", with a capital-D. Unfortunately, arrogant Designers tend to be terrible Engineers, and worse Architects. I'd be surprised if the Apple Exec Team even knows the technical difference between the three at this point. To an engineer, I'm seeing too little good engineering at Apple, the QA issues reflect Apple placing a low priority on understanding failure before it occurs. Prior to Jobs returning, Apple was known for all three, not JUST design. Today, you don't hear much about Engineering or Architecture. ALL DESIGN ALL THE TIME. And the lack of any LTS strategy, the lack of "automatic" updates to products like the Mac mini and the stumbles with the MacBook Pro, show me that Design has totally eclipsed Architecture too. A well-architected platform shouldn't be seeing 3-year "holes" and malfunctioning IO/GPUs like we are seeing, and it would not have seen so many technologies stagnant/"withering on the vine". One key example: when Apple removed the 3.5mm headphone jack, if Lightning had been "architected" they would have been ready to replace the 3.5mm headphone jack on the Mac. Think of that: the MacBook now with 2 capable ports; headphones and peripherals cross-platform compatible. Instead, the iMac Pro ships with a 3.5mm headphone jack that an iPhone X buyer can't use, and MacBook Pro users can't even plug their iPhone X in with the cable in the box. No conceivable way that was "architected" purposefully. At least, if it were, I've never had the misfortune of having worked with an Architect so daft in my lifetime.)
Score: 4 Votes (Like | Disagree)
justperry Avatar
103 months ago
Gonna clean install off this when it comes out, haven’t installed HS yet so hopefully it’ll be great from day 1 with this update
Spare your time, there's really few if any reasons to clean install macOS.

I am on OS X/macOS since the very first 10.0beta, I have never reinstalled, always just updated to the latest, had a few bugs here and there but they got fixed by Apple or I did myself.
Score: 3 Votes (Like | Disagree)
ScooterComputer Avatar
103 months ago
To be honest, these bugs have existed since Yosemite.
There were bugs I'd had filed against 10.7 that didn't get fixed until Sierra. Not one or two, dozens. Worse, some of the tickets are still open, Apple obviously doesn't even bother to test against Radar. And that only covers what they have FIXED; another several dozen they still haven't. I started beating the drum several years ago, during 10.7 and 10.8 that OS X QA was suffering under the 12-month dev cycle. Many of the "pundits" (Gruber, Dan Benjamin, Marco) ignored me, called me a "jackal" or "chicken little". Clearly, however, I was right. It has been all this time for anyone to see, if they just took off the rose-colored glasses and looked. The 12-month cycle is unsustainable, was unsustainable, and is now clearly impacting iOS (which itself had significantly impacted Mac OS X's timeline).

Personally, I think the solution is two-fold: Apple should 1) divorce the apps–ALL THE APPS–from OS releases (forces them to eat their own dogfood), and 2) move to a bifurcated OS release: a 24- or 36- month Long-Term Support base with 12- or 18- month + 6-month beta "feature" releases. Doing that, 10.9.5 should have been the LTS release, not 10.10 or 10.11 once 10.12 shipped. There is about zero reason that Apple pushed users off 10.9.5 considering the profligate bug issues with basic productivity apps and frameworks in 10.10 and 10.11 that still haven't even been completely resolved yet (PDFKit, USB bus issues, video artifacting, etc). On the iOS side, users are lurching back and forth between working and not-working releases, dealing for MONTHS with HomeKit and iCloud Photo Library problems (and more: Exchange, baseband reboots, battery, performance, etc).

It is just unacceptable… and was 100% avoidable if the Apple Exec team had just been paying better attention. We used to smugly laugh at Microsoft for this kind of garbage. Who should be laughing now?
Score: 2 Votes (Like | Disagree)
Steve's Dead Avatar
103 months ago
Gonna clean install off this when it comes out, haven’t installed HS yet so hopefully it’ll be great from day 1 with this update
Score: 2 Votes (Like | Disagree)

Popular Stories

iOS 26

When Will Apple Release iOS 26.2?

Monday December 1, 2025 4:37 pm PST by
We're getting closer to the launch of the final major iOS update of the year, with Apple set to release iOS 26.2 in December. We've had three betas so far and are expecting a fourth beta or a release candidate this week, so a launch could follow as soon as next week. Past Launch Dates Apple's past iOS x.2 updates from the last few years have all happened right around the middle of the...
ios 18 to ios 26 upgrade

Apple Pushes iPhone Users Still on iOS 18 to Upgrade to iOS 26

Tuesday December 2, 2025 11:09 am PST by
Apple is encouraging iPhone users who are still running iOS 18 to upgrade to iOS 26 by making the iOS 26 software upgrade option more prominent. Since iOS 26 launched in September, it has been displayed as an optional upgrade at the bottom of the Software Update interface in the Settings app. iOS 18 has been the default operating system option, and users running iOS 18 have seen iOS 18...
maxresdefault

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Monday December 1, 2025 3:00 am PST by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Subscribe to the MacRumors YouTube channel for more videos. Below, we've collated an updated set of key details that ...
iphone 17 cyber

iPhone 17 Demand Is Breaking Apple's Sales Records

Tuesday December 2, 2025 9:44 am PST by
Apple's iPhone 17 lineup is selling well enough that Apple is on track to ship more than 247.4 million total iPhones in 2025, according to a new report from IDC. Total 2025 shipments are forecast to grow 6.1 percent year over year due to iPhone 17 demand and increased sales in China, a major market for Apple. Overall worldwide smartphone shipments across Android and iOS are forecast to...
iOS 26

Apple Seeds iOS 26.2 and iPadOS 26.2 Release Candidates to Developers and Public Beta Testers

Wednesday December 3, 2025 10:33 am PST by
Apple today seeded the release candidate versions of upcoming iOS 26.2 and iPadOS 26.2 updates to developers and public beta testers, with the software coming two weeks after Apple seeded the third betas. The release candidates represent the final versions of iOS 26.2 and iPadOS 26.2 that will be provided to the public if no further bugs are found during this final week of testing....
Photos App Icon Liquid Glass

John Gruber Shares Scathing Commentary About Apple's Departing Software Design Chief

Thursday December 4, 2025 9:30 am PST by
In a statement shared with Bloomberg on Wednesday, Apple confirmed that its software design chief Alan Dye will be leaving. Apple said Dye will be succeeded by Stephen Lemay, who has been a software designer at the company since 1999. Meta CEO Mark Zuckerberg announced that Dye will lead a new creative studio within the company's AR/VR division Reality Labs. On his blog Daring Fireball,...
Touchscreen MacBook Feature

Here Are the Four MacBooks Apple Is Expected to Launch Next Year

Monday December 1, 2025 5:00 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Below is a breakdown of what we're expecting over the next ...
iphone air camera

iPhone Air's Resale Value Has Dropped Dramatically, Data Shows

Thursday December 4, 2025 5:27 am PST by
The iPhone Air has recorded the steepest early resale value drop of any iPhone model in years, with new data showing that several configurations have lost almost 50% of their value within ten weeks of launch. According to a ten-week analysis published by SellCell, Apple's latest lineup is showing a pronounced split in resale performance between the iPhone 17 models and the iPhone Air....
iPhone 17 Pro Cosmic Orange

iPhone 17 Pro Lost a Camera Feature Pro Models Have Had Since 2020

Thursday December 4, 2025 5:18 am PST by
iPhone 17 Pro models, it turns out, can't take photos in Night mode when Portrait mode is selected in the Camera app – a capability that's been available on Apple's Pro devices since the iPhone 12 Pro in 2020. If you're an iPhone 17 Pro or iPhone 17 Pro Max owner, try it for yourself: Open the Camera app with Photo selected in the carousel, then cover the rear lenses with your hand to...
chatgpt logo

Sam Altman Declares 'Code Red' for ChatGPT, Delays OpenAI Advertising Plans

Tuesday December 2, 2025 3:30 pm PST by
OpenAI is deprioritizing work on advertising as it focuses on improving the quality of ChatGPT, reports The Information. OpenAI CEO Sam Altman declared a "code red" on Monday, and told employees that the company needs to improve ChatGPT so it doesn't fall behind competitors like Google and Anthropic. Altman said that OpenAI needs to work on personalization for each user, image generation,...