Apple Releases macOS Big Sur 11.6.4 With Security Fixes

Apple today released macOS Big Sur 11.6.4, a security fix update that is designed for Mac users who continue to use the Big Sur operating system instead of macOS Monterey.

macOS Big Sur Feature Orange
The ‌‌‌‌macOS Big Sur 11.6.4‌‌ update can be downloaded on all eligible Macs using the Software Update section of System Preferences.

Today's update comes about two weeks after the launch of macOS Big Sur 11.6.3, which was released alongside macOS Monterey 12.2. Apple usually releases new versions of macOS Big Sur alongside Monterey updates, but today's Big Sur software release is standalone.

According to Apple's release notes for the update, macOS Big Sur 11.6.4 "improves the security of macOS" and is recommended for all users.

Apple has also released a 2022-002 macOS Catalina security update for those who are still running macOS Catalina.

Related Forum: macOS Big Sur

Popular Stories

m1 chip slide

Five Years of Apple Silicon: M1 to M5 Performance Comparison

Monday November 10, 2025 1:08 pm PST by
Today marks the fifth anniversary of the Apple silicon chip that replaced Intel chips in Apple's Mac lineup. The first Apple silicon chip, the M1, was unveiled on November 10, 2020. The M1 debuted in the MacBook Air, Mac mini, and 13-inch MacBook Pro. The M1 chip was impressive when it launched, featuring the "world's fastest CPU core" and industry-leading performance per watt, and it's only ...
All Screen iPhone 2027 Feature 1

Apple to Hide Selfie Camera Under Display of 20th Anniversary iPhone

Monday November 10, 2025 1:55 am PST by
Apple will conceal the front-facing camera under the screen of its 2027 iPhone, a Chinese leaker said today, corroborating reports that Apple's 20th anniversary iPhone will have no visible cutouts in the display. Weibo-based account Digital Chat Station said Apple's development of under-screen camera technology was progressing as planned for adoption in 2027, one year after it will...
Early Black Friday Deals 1

The Best Early Black Friday Apple Deals on AirPods, Apple Watch, iPad, and More

Saturday November 8, 2025 6:16 am PST by
We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...
2024 iPhone Boxes Feature

Apple Adjusts Trade-In Values for iPhones, iPads, Macs, and More

Thursday November 6, 2025 11:12 am PST by
Apple today updated its trade-in values for select iPhone, iPad, Mac, and Apple Watch models. Trade-ins can be completed on Apple's website, or at an Apple Store. The charts below provide an overview of Apple's current and previous trade-in values in the U.S., according to its website. Maximum values for most devices either decreased or saw no change, but the iPad Air received a slight bump. ...
iphone air thinness

iPhone Air Sales Are So Bad That Apple's Delaying the Next-Generation Version

Monday November 10, 2025 11:41 am PST by
The thin, light iPhone Air sold so poorly that Apple has decided to delay the launch of the next-generation iPhone Air that was scheduled to come out alongside the iPhone 18 Pro, reports The Information. Apple initially planned to release a new iPhone Air in fall 2026, but now that's not going to happen. Since the iPhone Air launched in September, there have been reports of poor sales...
Apple fitness plus feature

Future of Apple Fitness+ 'Under Review'

Sunday November 9, 2025 5:30 am PST by
The future of Apple Fitness+ is "under review" amid a reorganization of the service, according to Bloomberg's Mark Gurman. In the latest edition of his "Power On" newsletter, Gurman said that Apple Fitness+ remains one of the company's "weakest digital offerings." The service apparently suffers from high churn and little revenue. Nevertheless, Fitness+ has a small, loyal fanbase that...
iphone pocket%402x

Apple Debuts iPhone Pocket, a Limited Edition iPod Sock-Style Accessory

Tuesday November 11, 2025 1:23 am PST by
Apple has teamed up with Japanese fashion house ISSEY MIYAKE to launch iPhone Pocket, a 3D-knitted limited edition accessory designed to carry an iPhone, AirPods, and other everyday items. The accessory is like a stretchy pocket, not unlike an iPod Sock, but elongated to form a strap made of a ribbed, elastic textile that fully encloses an iPhone yet allows you to glimpse the display...
Liquid Glass General Feature

Apple Shares Liquid Glass Design Gallery

Thursday November 6, 2025 2:45 pm PST by
Apple is promoting the new Liquid Glass design in iOS 26, showing off the ways that third-party developers are embracing the aesthetic in their apps. On its developer website, Apple is featuring a visual gallery that demonstrates how "teams of all sizes" are creating Liquid Glass experiences. The gallery features examples of Liquid Glass in apps for iPhone, iPad, Apple Watch, and Mac. Apple...
iOS 26

iOS 26.1 Available Now With These 8 New Features

Monday November 3, 2025 5:54 am PST by
Following more than a month of beta testing, Apple released iOS 26.1 on Monday, November 3. The update includes a handful of new features and changes, including the ability to adjust the look of Liquid Glass and more. Below, we outline iOS 26.1's key new features. Liquid Glass Toggle iOS 26.1 lets you choose your preferred look for Liquid Glass. In the Settings app, under Display...
iPhone Satellite Feature

Apple Developing These 5 New Satellite Features for iPhone

Sunday November 9, 2025 6:07 am PST by
Apple is working on a series of new satellite connectivity features for the iPhone, Bloomberg's Mark Gurman reports. In this week's "Power On" newsletter, Gurman revealed that the new features in development include: Apple Maps via satellite: Navigation in Apple Maps without cellular or Wi-Fi connectivity. Photos in Messages via satellite: Support for sending photos in the Messages...

Top Rated Comments

warpdrive Avatar
49 months ago
I'm probably not alone in thinking that I can wait a while longer before upgrading from Big Sur to Monterey. Most these MacOS releases are pretty meh....nothing overly compelling to get me to upgrade right away.

So I'm glad they are still supporting previous OS with security updates
Score: 17 Votes (Like | Disagree)
AndiG Avatar
49 months ago
I remember the days when Snow Leopard was released. A new OS version was really great. Don‘t remeber if you had to pay for SL, but at least for the earlier updates one could get an update for some bucks.

Today is more like: Meh, an update? Again? Couldn‘t you just leave me alone with your da*n updates? Bugs, every year, bugs, bugs, bugs and after that, fixes, fixes fixes. Live, die, repeat e-v-e-r-y year!!!!

I like the way some Linux distros handle this. You can live on the edge or you can get LTS versions with ~8 years security fixes and you don‘t need an OS update for a new browser or new emojis. Wish Apple would slow down with UI and other „improvements“.

New OS version every 3-4 years? Release it when it is done? I don‘t want your latest and greatest, Apple. Just want a stable OS.
Score: 7 Votes (Like | Disagree)
Mr. Dee Avatar
49 months ago
Still on Big Sur, very stable, in no rush to upgrade. Will likely switch to Monterrey after macOS 13 launches.
Score: 7 Votes (Like | Disagree)
MallardDuck Avatar
49 months ago
I SO wish I could be back on Big Sur. Monterey is the worst release in memory. They *still* haven't fixed the USB bugs.
Score: 5 Votes (Like | Disagree)
jdclifford Avatar
49 months ago

Apple releases iOS 14.x update for those that do not want, cough, not yet ready to upgrade to iOS 15.x

Wishful thinking
And for those whose hardware Apple doesn't support anymore (i.e. can't upgrade to Monterey) like my 2015 MacBook 12".
Score: 4 Votes (Like | Disagree)
eadnams Avatar
49 months ago
Wish they released Big Sur for M1 Pro & Max :(
Score: 4 Votes (Like | Disagree)