Apple Seeds Second Beta of macOS Sierra 10.12.5 to Developers

by

Apple today seeded the second beta of an upcoming macOS Sierra 10.12.5 update to developers, nearly two weeks after seeding the first beta and two weeks after releasing macOS Sierra 10.12.4, which introduced Night Shift for the Mac.

macOS Sierra 10.12.5 can be downloaded through the Apple Developer Center or through the Software Update mechanism in the Mac App Store.

macOS 10
According to the release notes accompanying the beta, the update "improves the stability, compatibility, and security of your Mac."

Because Apple's release notes don't often provide much insight into what's included in new beta software, we don't yet know what features or bug fixes might be included in 10.12.5.

Nothing notable was discovered in the first beta, but should new features be discovered in the second macOS Sierra 10.12.5 beta, we'll update this post.

Related Forum: macOS 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...
Read Full Article
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...
Read Full Article • 79 comments
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 ...
Read Full Article • 149 comments
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...
Read Full Article • 154 comments
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...
Read Full Article • 37 comments

Top Rated Comments

xflashx Avatar
xflashx
115 months ago
It would be reallyyyy nice if they could release a detailed change-log for once other than "this update improves stability" bla bla so we know what to expect or what to look out for..
Score: 14 Votes (Like | Disagree)
MikhailT Avatar
MikhailT
115 months ago
It would be reallyyyy nice if they could release a detailed change-log for once other than "this update improves stability" bla bla so we know what to expect or what to look out for..
I agree, that's one of the reasons why I love the team running Safari Technology Preview, they do great release notes. I wish Apple'd do the same for all of their releases.
Score: 9 Votes (Like | Disagree)
cult hero Avatar
cult hero
115 months ago
10.12.4 was a big deal for me. A lot of issues I've had with the Touch Bar and Thunderbolt 3 appears to have gone away. I had griped that the 2016 MBP was the most unstable Mac I have owned since the switch to Intel (that was pretty bumpy early on) each new release of Sierra, 10.12.4 in particular, has improved things.

* No more randomly vanishing portions of the Touch Bar. (I was starting to think I had bad hardware.)
* No more sleep/way system crashes while connected to Thunderbolt 2 or 3 devices.
* Far less application crashing.

As others have stated, I wish they would be more detailed in their release notes.
Score: 9 Votes (Like | Disagree)
MrGuder Avatar
MrGuder
115 months ago
It would be reallyyyy nice if they could release a detailed change-log for once other than "this update improves stability" bla bla so we know what to expect or what to look out for..
Exactly, we don't need any security info but they need to be more transparent on what the specific fixes would be. I mean Apple fixing a bug or glitch is a good thing why hide it under a general broad statement, be more specific and transparent.
Score: 4 Votes (Like | Disagree)
gsmornot Avatar
gsmornot
115 months ago
Exactly, we don't need any security info but they need to be more transparent on what the specific fixes would be. I mean Apple fixing a bug or glitch is a good thing why hide it under a general broad statement, be more specific and transparent.
I would like this with all updates including app updates. So often they say bug fixes and thats all.
Score: 3 Votes (Like | Disagree)
justperry Avatar
justperry
115 months ago
No, at least not for me - Retina 4K iMac and the latest macOS update VASTLY improved the overall speed and snappiness of the OS.

iOS no difference, which is a good thing as it runs beautifully as is on my iPad Mini 4.

That's what betas and reviewer testing's for - reviewers who download the latest and report in. But I get where you're coming from, sometimes it is a bit iffy not knowing what will and won't be improved etc.
This, and iOS flies since the new file System.:)
Score: 3 Votes (Like | Disagree)
Read All Comments