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

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

iOS 26

Everything New in iOS 26.1 Beta 1

Monday September 22, 2025 12:44 pm PDT by
Apple released the first beta of iOS 26.1 today, just a week after launching iOS 26. iOS 26.1 mainly adds new languages to Apple Intelligence, but there are a few other features that are worth knowing about. New Apple Intelligence Languages Apple Intelligence is now available in Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese. AirPo...
apple tv 4k new orange

Next Apple TV Expected to Launch This Year With These New Features

Monday September 22, 2025 10:00 am PDT by
The next Apple TV is expected to be released later this year, and a handful of new features and changes have been rumored for the device. Below, we recap what to expect from the next Apple TV, according to rumors. Likely Features N1 Chip With Wi-Fi 7 Last year, Bloomberg's Mark Gurman said the next Apple TV would be equipped with Apple's own combined Wi-Fi and Bluetooth chip, which is...
Apple Intelligence General Feature 2

iOS 26.1 Adds New Apple Intelligence Languages and Expands AirPods Live Translation

Monday September 22, 2025 11:15 am PDT by
With iOS 26.1, Apple Intelligence is gaining support for additional languages, including Danish, Dutch, Norwegian, Portuguese (Portugal), Swedish, Turkish, Chinese (Traditional), and Vietnamese. Apple announced plans to expand the languages that can be used with Apple Intelligence last year, and now the added language support is here. Apple Intelligence is now available in the following...
Apple Foldable Thumb

Foldable iPhone Like 'Two Titanium iPhone Airs' Joined at the Hinge

Monday September 22, 2025 2:16 am PDT by
Next year's rumored foldable iPhone will showcase an ultra-thin design resembling "two titanium iPhone Airs side-by-side," according to Bloomberg's Mark Gurman. Writing in the Q&A section of his latest Power On newsletter, Gurman says Apple's first foldable device will be "super thin and a design achievement," combining Apple's thinnest iPhone form factor with cutting-edge folding...
iPhone 17 Pro and Air N1 Feature

Some iPhone 17, iPhone 17 Pro, and iPhone Air Users Experiencing Intermittent Wi-Fi Issue

Monday September 22, 2025 8:44 am PDT by
Apple's latest iPhone models launched on Friday, and some early adopters of the devices are experiencing intermittent Wi-Fi issues. Affected customers say Wi-Fi connectivity periodically cuts out on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air, with hundreds of comments about the issue posted across the MacRumors Forums, Reddit, and the Apple Support Community over the...
iPhone 17 Pro and Air Feature

Two iPhone 17 Pro and iPhone Air Colors Appear to Scratch More Easily

Friday September 19, 2025 10:02 am PDT by
As reported by Bloomberg today, some of the new iPhone 17 Pro and iPhone Air models on display at Apple Stores today are already scratched and scuffed. French blog Consomac also reported on this topic. The scratches appear to be most prominent on models with darker finishes, including the iPhone 17 Pro and Pro Max in Deep Blue, and the iPhone Air in Space Black. Images Credit: Consoma ...
iPhone 17 Pro USB C Port

iPhone 17 Pro Max's USB-C Charging Speeds Tested With Apple Chargers

Monday September 22, 2025 7:29 am PDT by
The website ChargerLAB has tested the iPhone 17 Pro Max's USB-C charging speeds with a variety of Apple's chargers, from 18W to 140W. The device reached a peak charging speed of around 36W with the following Apple chargers:40W Dynamic Power Adapter with 60W Max 61W USB-C Power Adapter 67W USB-C Power Adapter 70W USB-C Power Adapter 96W USB-C Power Adapter 140W USB-C Power AdapterFor...
iOS 26

Apple Seeds First Betas of iOS 26.1, iPadOS 26.1, and macOS Tahoe 26.1

Monday September 22, 2025 10:05 am PDT by
Apple today provided developers with the first betas of upcoming iOS 26.1, iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, watchOS 26.1, and visionOS 26.1 updates for testing purposes. The new betas are the first updates to the iOS, iPadOS, macOS 26, watchOS, tvOS, and visionOS releases that came out last week. The new betas can be downloaded from the Settings app on a compatible device by going...

Top Rated Comments

scottlitch Avatar
96 months ago
Is HomeKit coming to MacOS?
Score: 5 Votes (Like | Disagree)
jjhny Avatar
96 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
96 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
96 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
96 months ago
Is HomeKit coming to MacOS?
... that comes in 10.14
Score: 2 Votes (Like | Disagree)
OscarMV Avatar
96 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)