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

The 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.

No major outward-facing changes were discovered in the first two betas of macOS High Sierra 10.13.3, but we'll update this post should new features be found in the third beta.

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 made a public beta available for public beta testers.

Related Forum: macOS High Sierra

Top Rated Comments

justperry Avatar
100 months ago
Will this make your Mac 5%-30% slower.:rolleyes:


*I look at you Intel.:mad:
Score: 4 Votes (Like | Disagree)
RazorD Avatar
100 months ago
Will this make your Mac 5%-30% slower.:rolleyes:
No. That was already patched in 10.13.2. Have you noticed any performance changes since you installed it? :P
Score: 3 Votes (Like | Disagree)
tywebb13 Avatar
100 months ago
Anyone know which folder it downloads the installer to??
When you start the update there will be a numbered folder in /Library/Updates. The update files are inside the numbered folder.

What that number is depends on the version you get.

If you get the normal delta it will be 091-57950 (this is the only one with the new Mac OS Brain)

If you get the patch it will be 091-57567

If you get the combo it will be 091-57566

In the case that you get the 091-57950 and also require a Bridge OS, you will get another one with number 091-57951 with the separate Bridge OS Update.
Score: 1 Votes (Like | Disagree)
RazorD Avatar
100 months ago
Do you have any evidence? :eek:
Yeh. Apple's fix is called "Double Map".

https://twitter.com/aionescu/status/948609809540046849
Score: 1 Votes (Like | Disagree)
justperry Avatar
100 months ago
Well, if it was really already patched in MacOS I didn't even notice performance drops, so there's that.
Score: 1 Votes (Like | Disagree)

Popular Stories

iPhone 17 Pro Dark Blue and Orange

iPhone 17 Release Date, Pre-Orders, and What to Expect

Thursday August 28, 2025 4:08 am PDT by
An iPhone 17 announcement is a dead cert for September 2025 – Apple has already sent out invites for an "Awe dropping" event on Tuesday, September 9 at the Apple Park campus in Cupertino, California. The timing follows Apple's trend of introducing new iPhone models annually in the fall. At the event, Apple is expected to unveil its new-generation iPhone 17, an all-new ultra-thin iPhone 17...
iPhone 17 Pro Iridescent Feature 2

iPhone 17 Pro Clear Case Leak Reveals Three Key Changes

Sunday August 31, 2025 1:26 pm PDT by
Apple is expected to unveil the iPhone 17 series on Tuesday, September 9, and last-minute rumors about the devices continue to surface. The latest info comes from a leaker known as Majin Bu, who has shared alleged images of Apple's Clear Case for the iPhone 17 Pro and Pro Max, or at least replicas. Image Credit: @MajinBuOfficial The images show three alleged changes compared to Apple's iP...
iphone 16 pro ghost hand

iPhone 17 Pro: 5 Reasons Not to Upgrade This Year

Monday September 1, 2025 4:35 am PDT by
Apple will launch its new iPhone 17 series this month, and the iPhone 17 Pro models are expected to get a new design for the rear casing and the camera area. But more significant changes to the lineup are not expected until next year, when the iPhone 18 models arrive. If you're thinking of trading in your iPhone for this year's latest, consider the following features rumored to be coming to...
xiaomi apple ad india

Apple and Samsung Push Back Against Xiaomi's Bold India Ads

Friday August 29, 2025 4:54 am PDT by
Apple and Samsung have reportedly issued cease-and-desist notices to Xiaomi in India for an ad campaign that directly compares the rivals' devices to Xiaomi's products. The two companies have threatened the Chinese vendor with legal action, calling the ads "disparaging." Ads have appeared in local print media and on social media that take pot shots at the competitors' premium offerings. One...
iOS 18 on iPhone Arrow Down

Apple Preparing iOS 18.7 for iPhones as iOS 26 Release Date Nears

Sunday August 31, 2025 4:35 pm PDT by
Apple is preparing to release iOS 18.7 for compatible iPhone models, according to evidence of the update in the MacRumors visitor logs. We expect iOS 18.7 to be released in September, alongside iOS 26. The update will likely include fixes for security vulnerabilities, but little else. iOS 18.7 will be one of the final updates ever released for the iPhone XS, iPhone XS Max, and iPhone XR,...