Apple Releases Second Beta of macOS High Sierra 10.13.5 to Public Beta Testers

Apple today released the second beta of an upcoming macOS High Sierra 10.13.5 update to public beta testers, two weeks after seeding the first beta and three weeks after releasing macOS High Sierra 10.13.4. Today's public beta is identical to the second beta provided to developers earlier this week.

Beta testers who have signed up for Apple's beta testing program will be able to download the new macOS High Sierra beta through the Software Update mechanism in the Mac App Store.

macoshighsierra10135publicbeta
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.

macOS High Sierra 10.13.5 once again introduces support for Messages on iCloud, a feature that was present in macOS High Sierra 10.13.4 betas but pulled ahead of the release of the updated software.

Messages on iCloud is designed to store your iMessages in iCloud for improved syncing. Right now, incoming iMessages will be 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.

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

No other major outward-facing changes were discovered in the first two developer betas, but the update likely includes bug fixes and improvements to address issues discovered since the release of macOS High Sierra 10.13.4. Because Apple does not provide detailed release notes for macOS High Sierra updates, we may not know exactly what's included until the new software is provided to the public.

Related Forum: macOS High Sierra

Popular Stories

wwdc sans text feature

Apple Rumored to Announce New Product on February 19

Thursday February 5, 2026 12:22 pm PST by
Apple plans to announce the iPhone 17e on Thursday, February 19, according to Macwelt, the German equivalent of Macworld. The report, citing industry sources, is available in English on Macworld. Apple announced the iPhone 16e on Wednesday, February 19 last year, so the iPhone 17e would be unveiled exactly one year later if this rumor is accurate. It is quite uncommon for Apple to unveil...
maxresdefault

Apple Shows Off a Key Reason to Upgrade to the iPhone 17

Saturday February 7, 2026 9:26 am PST by
Apple today shared an ad that shows how the upgraded Center Stage front camera on the latest iPhones improves the process of taking a group selfie. "Watch how the new front facing camera on iPhone 17 Pro takes group selfies that automatically expand and rotate as more people come into frame," says Apple. While the ad is focused on the iPhone 17 Pro and iPhone 17 Pro Max, the regular iPhone...
Apple Logo Zoomed

Tim Cook Teases Plans for Apple's Upcoming 50th Anniversary

Thursday February 5, 2026 12:54 pm PST by
Apple turns 50 this year, and its CEO Tim Cook has promised to celebrate the milestone. The big day falls on April 1, 2026. "I've been unusually reflective lately about Apple because we have been working on what do we do to mark this moment," Cook told employees today, according to Bloomberg's Mark Gurman. "When you really stop and pause and think about the last 50 years, it makes your heart ...
Finder Siri Feature

Why Apple's iOS 26.4 Siri Upgrade Will Be Bigger Than Originally Promised

Friday February 6, 2026 3:06 pm PST by
In the iOS 26.4 update that's coming this spring, Apple will introduce a new version of Siri that's going to overhaul how we interact with the personal assistant and what it's able to do. The iOS 26.4 version of Siri won't work like ChatGPT or Claude, but it will rely on large language models (LLMs) and has been updated from the ground up. Upgraded Architecture The next-generation...
iOS 26

iOS 26.3 and iOS 26.4 Will Add These New Features to Your iPhone

Tuesday February 3, 2026 7:47 am PST by
While the iOS 26.3 Release Candidate is now available ahead of a public release, the first iOS 26.4 beta is likely still at least a week away. Following beta testing, iOS 26.4 will likely be released to the general public in March or April. Below, we have recapped known or rumored iOS 26.3 and iOS 26.4 features so far. iOS 26.3 iPhone to Android Transfer Tool iOS 26.3 makes it easier...

Top Rated Comments

Mac32 Avatar
102 months ago
If you still haven't updated to High Sierra, DON'T. Sierra was a better OS, and there are no real benefits with High Sierra (unless you want to use an eGPU). It's basically the same system with a new slower file system (vs HFS), startup and overall response is slightly slower, there are various bugs depending upon which Mac model you use etc...etc... The latest 10.13.4 update made things worse, not better (introduced new bugs with both my iMac Pro and MacBook). This is like walking backwards into the future.
Score: 7 Votes (Like | Disagree)
crescentmoon Avatar
102 months ago
I have the latest HS on my mid 2010 mac pro and it is the stablest OS so far for my computer. I was on sierra but I was getting system freezes that multiplied after the security updates. There has not been one system freeze or crash since updating to HS 10.13.4
Score: 5 Votes (Like | Disagree)
ipponrg Avatar
102 months ago
I'm still on El Capitan on my work laptop, and Sierra on my home laptop.

Am also afraid to upgrade :D
Score: 3 Votes (Like | Disagree)
amaze1499 Avatar
102 months ago
I still don't get it. I can open multiple PDFs and drag and drop thumbnails of any page to any document and rearrange the oder.

Maybe you needto turn on thumbnails here?

works for me as usual as well
Score: 2 Votes (Like | Disagree)
Squuiid Avatar
102 months ago
I have the latest HS on my mid 2010 mac pro and it is the stablest OS so far for my computer. I was on sierra but I was getting system freezes that multiplied after the security updates. There has not been one system freeze or crash since updating to HS 10.13.4
Same here. High Sierra on a 2010 Mac Pro is a rock.
On a 2016 Touchbar MacBook Pro with LG 5K screen, not so much. It crashes a lot.
Score: 2 Votes (Like | Disagree)
otternonsense Avatar
102 months ago
You said HS has been crap. I gave an example of a specific HS-only feature saving me several hundred pounds.
Ok, fair. We have completely different usage scenarios, and I admit I had overlooked this feature.

Speaking from the shoes of a designer working with multiple displays and I/O means, High Sierra (and the new MBP) have offered me nothing but setbacks.
Score: 1 Votes (Like | Disagree)