Apple Seeds Fourth Beta of macOS Sierra 10.12.6 to Developers [Update: Public Beta Available]

Apple today seeded the fourth beta of an upcoming macOS Sierra 10.12.6 update to developers, a little less than week after seeding the third beta and more than a month after releasing macOS Sierra 10.12.5, a minor bug fix update.

The fourth beta of macOS Sierra 10.12.6 can be downloaded through the Apple Developer Center or through the Software Update mechanism in the Mac App Store.

10
We didn't find any significant features or notable bug fixes in the first three macOS Sierra betas, and because Apple does not provide beta release notes, it's likely we won't know what's included in the update until it sees a public release.

macOS Sierra 10.12.6 is likely to be one of the final updates to the Sierra operating system as Apple transitions to macOS High Sierra, which was introduced at the Worldwide Developers Conference in June.

Update: A fourth public beta of macOS Sierra 10.12.6 is also available for public beta testers.

Related Forum: macOS Sierra

Popular Stories

iPhone 17 Pro 3 4ths Perspective Aluminum Camera Module 1

New iPhone 17 Pro Details: Brighter Display, Best Battery Life, and More

Wednesday September 3, 2025 5:33 am PDT by
Apple's iPhone 17 Pro and iPhone 17 Pro Max models will feature a number of significant display, thermal, and battery improvements, according to new late-stage rumors. According to the Weibo leaker known as "Instant Digital," the iPhone 17 Pro models will feature displays with higher brightness, making it more suitable for use in direct sunlight for prolonged periods. The iPhone 16 Pro and...
iPhone 17 Pro Iridescent Feature 2

iPhone 17 and iPhone 17 Pro Prices Estimated Ahead of Apple Event Next Week

Tuesday September 2, 2025 1:50 pm PDT by
Just one week before Apple is expected to unveil the iPhone 17 series, an analyst has shared new price estimates for the devices. Here are J.P. Morgan analyst Samik Chatterjee's price estimates for the iPhone 17 series in the United States, according to 9to5Mac: Model Starting Price Model Starting Price Change iPhone 16 $799 iPhone 17 ...
Apple Watch Ultra 2 Complications

Apple Watch Ultra 3 Coming Next Week: Eight Reasons to Upgrade

Thursday September 4, 2025 7:38 am PDT by
We're only days away from Apple's "Awe dropping" fall event scheduled to take place on Tuesday, September 9 – and along with the new iPhone 17 series, we're going to get a new version of the Apple Watch Ultra for the first time since 2023. By the time the Ultra 3 is unveiled, it will have been two years since the previous model arrived. The intervening period has left plenty of room for...
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 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 AIR Loud Feature

iPhone 17 Air Could Start at $1,099 With 256GB Storage, 1TB for $1,499

Thursday September 4, 2025 2:54 am PDT by
Apple's upcoming iPhone 17 Air will have a $1,099 starting price providing 256GB of base storage and will max out at $1,499 with a 1TB option, according to the latest TrendForce report. Apple will offer three price/storage tiers for the all-new ultra-thin iPhone 17 model, which replaces last year's iPhone 16 Plus in the lineup. Here's how TrendForce sees them breaking down: 256GB — $1099...

Top Rated Comments

b001ean Avatar
107 months ago
iOS 11 Beta 2, please. :)
Score: 13 Votes (Like | Disagree)
scwinsett Avatar
107 months ago
Oh darn I got excited for a moment
Score: 7 Votes (Like | Disagree)
User 6502 Avatar
107 months ago
Who cares about macOS Sierra, just work on High Sierra please :)
Score: 6 Votes (Like | Disagree)
TMRJIJ Avatar
107 months ago
Enough with the dam betas it must be ready by now dam
You say that now but when it does releases and one person’s Mac glitches out, Everyone here scream “Apple is Doomed! Steve Jobs would never..! Snow Leopard!.. blah blah blah...”
Score: 5 Votes (Like | Disagree)
antmarobel Avatar
107 months ago
eagerly waiting for High Sierra second beta...
Score: 4 Votes (Like | Disagree)
tkukoc Avatar
107 months ago
Don't know why they release it for developers only and then turn around and allow the public beta just a few hours later. Is there really that high of a demand that they have to be staggered?
It's in case a developer notices a major issue. Then Apple can stop the public fanbase from installing.
Score: 4 Votes (Like | Disagree)