Apple Seeds Fourth Beta of macOS High Sierra 10.13.5 to Developers [Update: Public Beta Available]

by

Apple today seeded the fourth beta of an upcoming macOS High Sierra 10.13.5 update to developers, one week after seeding the third beta and more than a month after releasing the macOS High Sierra 10.13.4 update.

The new macOS High Sierra 10.13.5 beta can be downloaded through Apple Developer Center or the Software Update mechanism in the Mac App Store with the proper profile installed.

macoshighsierra10135beta
macOS High Sierra 10.13.5 introduces support for Messages on iCloud, a feature that was previously present in macOS High Sierra 10.13.4 betas before being pulled ahead of the release of the update. Messages on iCloud is also available in iOS 11.4.

The Messages on iCloud feature is designed to store your iMessages in iCloud for improved syncing. Right now, incoming iMessages are sent to all devices where you're signed into your Apple ID, but it's not true cloud-based syncing because your old messages don't show up on new devices nor does deleting a message remove it from all of your devices, both features enabled through Messages on iCloud.

Messages on iCloud also allows your older iMessages and attachments to be stored in iCloud rather than on your iPhone, iPad or Mac, saving valuable storage space.

The update also likely includes bug fixes and performance improvements for issues that weren't addressed in macOS High Sierra 10.13.4, but as Apple does not provide detailed release notes for macOS High Sierra beta updates, we may not know exactly what's included until the new software is provided to the public.

No major outward-facing changes were found in the first three betas of macOS High Sierra 10.13.5, but we'll update this post should any new features be found in the fourth.

The previous update, macOS High Sierra 10.13.4, brought support for external graphics processors (eGPUs) along with Business Chat in Messages and several other bug fixes and smaller feature improvements.

Update: Apple has made a new version of macOS High Sierra 10.13.5 available to public beta testers.

Related Forum: macOS High Sierra

Popular Stories

Apple Wallet ID Illinois

Apple Plans to Expand iPhone Driver's Licenses to These 7 U.S. States

Wednesday December 24, 2025 8:40 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. The feature is currently available in 13 U.S. states and Puerto Rico, and it is expected to launch in at least seven more in the future. To set up the...
Read Full Article • 50 comments
iPhone Top Left Hole Punch Face ID Feature Purple

iPhone 18 Pro Launching Next Year With These 12 New Features

Tuesday December 23, 2025 8:36 am PST by
While the iPhone 18 Pro and iPhone 18 Pro Max are not expected to launch for another nine months, there are already plenty of rumors about the devices. Below, we have recapped 12 features rumored for the iPhone 18 Pro models. The same overall design is expected, with 6.3-inch and 6.9-inch display sizes, and a "plateau" housing three rear cameras Under-screen Face ID Front camera in...
Read Full Article • 98 comments
maxresdefault

Where's the New Apple TV?

Monday December 22, 2025 11:30 am PST by
Apple hasn't updated the Apple TV 4K since 2022, and 2025 was supposed to be the year that we got a refresh. There were rumors suggesting Apple would release the new Apple TV before the end of 2025, but it looks like that's not going to happen now. Subscribe to the MacRumors YouTube channel for more videos. Bloomberg's Mark Gurman said several times across 2024 and 2025 that Apple would...
Read Full Article • 176 comments
maxresdefault

10 Mac Apps Worth Trying in 2026

Wednesday December 24, 2025 9:27 am PST by
2026 is almost upon us, and a new year is a good time to try out some new apps. We've rounded up 10 excellent Mac apps that are worth checking out. Subscribe to the MacRumors YouTube channel for more videos. Alt-Tab (Free) - Alt-Tab brings a Windows-style alt + tab thumbnail preview option to the Mac. You can see a full window preview of open apps and app windows. One Thing (Free) -...
Read Full Article • 99 comments
iOS 26

iOS 26.2 Adds These 8 New Features to Your iPhone

Monday December 22, 2025 8:47 am PST by
Earlier this month, Apple released iOS 26.2, following more than a month of beta testing. It is a big update, with many new features and changes for iPhones. iOS 26.2 adds a Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. Below, we have highlighted a total of eight new features. Liquid Glass Slider on Lock Screen A new slider in the Lock...
Read Full Article
airpods color prototypes

Apple Tested AirPods in Bright Colors

Saturday December 27, 2025 6:06 am PST by
Apple reportedly tested a version of the first-generation AirPods with bright, iPhone 5c-like colored charging cases. The images, shared by the Apple leaker and prototype collector known as "Kosutami," claim to show first-generation AirPods prototypes with pink and yellow exterior casings. The interior of the charging case and the earbuds themselves remain white. They seem close to some...
Read Full Article • 67 comments
iPhone Fold Vertical Feature

Why Apple's Foldable iPhone May Be Smaller Than Expected

Tuesday December 23, 2025 5:21 am PST by
Apple's first foldable iPhone, rumored for release next year, may turn out to be smaller than most people imagine, if a recent report is anything to go by. According to The Information, the outer display on the book-style device will measure just 5.3 inches – that's smaller than the 5.4-inch screen on the ‌iPhone‌ mini, a line Apple discontinued in 2022 due to poor sales. The report has led ...
Read Full Article • 204 comments
iPhone SE Cosmopolitan Clean

Apple Discontinued These 25 Products This Year

Wednesday December 24, 2025 7:24 am PST by
With the end of 2025 near, the time has come to look back at the devices and accessories that Apple discontinued throughout the year. Most of the products that were discontinued this year were simply replaced by a new model with an updated chip. However, the iPhone SE line was entirely discontinued when the iPhone 16e launched, and the iPhone Plus line is being phased out. Below, we have...
Read Full Article • 13 comments
Foldable iPhone 2023 Feature Iridescent Search

Samsung Developing 'Wide Fold' With iPhone Fold-Like Design Ahead of Apple's 2026 Launch

Tuesday December 23, 2025 11:55 am PST by
Samsung is working on a new foldable smartphone that's wider and shorter than the models that it's released before, according to Korean news site ETNews. The "Wide Fold" will compete with Apple's iPhone Fold that's set to launch in September 2026. Samsung's existing Galaxy Z Fold7 display is 6.5 inches when closed, and 8 inches when open, with a 21:9 aspect ratio when folded and a 20:18...
Read Full Article • 92 comments

Top Rated Comments

scottlitch Avatar
scottlitch
100 months ago
Is HomeKit coming to MacOS?
Score: 5 Votes (Like | Disagree)
jjhny Avatar
jjhny
100 months ago
This is typically the magic number for me to think about trusting it on my workstations. Around the the 5th revision.

I used to jump right into the newest OS, but it isn't worth it anymore. They don't do enough real world Q&A.
Score: 4 Votes (Like | Disagree)
fhall1 Avatar
fhall1
100 months ago
This is typically the magic number for me to think about trusting it on my workstations. Around the the 5th revision.

I used to jump right into the newest OS, but it isn't worth it anymore. They don't do enough real world Q&A.
For the last three major versions (10.10, 10.11, and 10.2) I have waited until September to update to the final revision (e.g 10.12.6) just before the new major OS version is released. Then I stay there until the next Sept......rinse, repeat. This way I (hopefully) get the most stable release of the current OS version, just before it's not current any more. Any third party hardware and software should have been updated and with Apple not really including "must-have" features in the brand new OS versions lately, this process has served me well.
Score: 4 Votes (Like | Disagree)
ignatius345 Avatar
ignatius345
100 months ago
Still no APFS for Fusion Drives??!! I fell like I'm living in a limbo...:mad:
We've been living with HFS+ for 20 years. Another few months ain't gonna kill us.

I'd rather it work rock solidly than deal with weird anomalies with my data, thanks.
Score: 3 Votes (Like | Disagree)
Babygotfont Avatar
Babygotfont
100 months ago
Is HomeKit coming to MacOS?
... that comes in 10.14
Score: 2 Votes (Like | Disagree)
OscarMV Avatar
OscarMV
100 months ago
I got out of the iOS beta when 11.3 went live. I so missed iMessage in the Cloud that I recently installed 11.4 on my phone and iPad. Was still hurting that the latest version of Mac OS beta didn't appear to have the feature. I guess they just added it based on this story. It is painful having to delete like 30 messages in the Mac app. Click the little X, click the delete confirmation, click the little X, click the delete confirmation, repeat 28 more times.
If you don't want to take your hands off the keyboard, press command-D to confirm deletion.

It used to be that you could skip deletion verification by pressing command-option-delete or option-click on the X, but that got removed with Messages in the Cloud.
Score: 1 Votes (Like | Disagree)
Read All Comments