Apple today released macOS Catalina 10.15.3, the third update to the macOS Catalina operating system that was released in October. macOS Catalina 10.15.3 comes over a month after the release of macOS Catalina 10.15.2.

‌‌macOS Catalina‌‌ 10.15.3 can be downloaded from the Mac App Store for free using the Update feature in the System Preferences app, and it is available to anyone who has a compatible Mac.

macos catalina wallpaper
macOS Catalina 10.15.3 has code in it that suggests a new "Pro Mode" is coming to Apple's Macs. Pro Mode appears to be an optional setting that overrides fan speed limits and energy saving restrictions to improve performance. The code says that apps "may run faster" but battery life could decrease and fan noise could increase.

It's not entirely clear if Pro Mode is coming to Macs in the 10.15.3 release, but the code is there so it is a possibility. According to Apple's release notes, the update includes Pro Display XDR optimizations and multi-stream video editing improvements.

The macOS Catalina 10.15.3 update improves the stability, reliability and security of your Mac, and is recommended for all users.
This update:
- Optimizes gamma handling of low gray levels on Pro Display XDR for SDR workflows when using macOS
- Improves multi-stream video editing performance for HEVC and H.264 encoded 4K video on the 16-inch MacBook Pro (2019)

For more on everything that's new in ‌macOS Catalina‌, make sure to check out our dedicated macOS Catalina roundup.

Top Rated Comments

sugargliderdude Avatar
26 months ago
i said i would install Catalina once its at 10.15.3 but still not sure if i should... hearing so many horror stories.
Score: 10 Votes (Like | Disagree)
jb-net Avatar
26 months ago
Biggest question: Will it fix Mail's data loss bug? Or is Mail.app on Catalina still randomly deleting E-Mails?
Score: 8 Votes (Like | Disagree)
pavvel Avatar
26 months ago

Fingers crossed for Notes syncing with iCloud again.
Never had a problem with notes syncing since the first version.
Score: 5 Votes (Like | Disagree)
VanNess Avatar
26 months ago

I would switch the Apple Mail if it did one thing Outlook did. Separate days in my inbox. I have today, yesterday, last week and older in my main view in Outlook. Apple Mail is just here you go, sort it out.
You can set up smart mailboxes ('https://support.apple.com/guide/mail/use-smart-mailboxes-mlhlp1190/mac') for today, yesterday, last week, etc. Pretty easy to do and I have it set up that way with links copied to the favorites bar. Since they are smart mailboxes your inbox remains untouched. Since doing this I rarely access my inbox. No need.
Score: 5 Votes (Like | Disagree)
macintoshmac Avatar
26 months ago

Biggest question: Will it fix Mail's data loss bug? Or is Mail.app on Catalina still randomly deleting E-Mails?
It was said to have been fixed in the third beta. If this build is the same or higher, the bug may be fixed. MR has stopped giving build numbers long back, so just wait for someone to provide you with a build number. I am downloading it, but did not bother to catch the build so can't tell you right now.
Score: 4 Votes (Like | Disagree)
Steve121178 Avatar
26 months ago

I just installed the update and the issue with the external monitor and the fans is still there, right now the fans are running at 3200 RPM and the machine is really hot just by browsing the web to get to this page.

I talked to Apple support (again) and now they want a video of the machine so they can hear the fans running, I can't believe that a company that just announced that made 92 billions in revenue in the last quarter can't replicate this issue on their offices. I'm starting to think that their priorities have changed
Not being funny, but you should know the Mac and macOS isn't a priority. The Mac has been severely neglected for many years and macOS gets a token annual update that doesn't really add very much and just further aligns the desktop OS with iOS in one way or another. There's been very little innovation and advancements with macOS.

The number of bugs and issues with Catalina is inexcusable, but do they really care? NO, they don't.

All the talent has been pulled from macOS over the years to work on iOS & it's variants as that is Apple's future. The Mac isn't.
Score: 4 Votes (Like | Disagree)

Popular Stories

airpodsinear 1

AirPods Save Woman's Life With Feature Everyone Should Know

Friday January 21, 2022 2:13 am PST by
Apple's AirPods have been credited with saving a woman's life after a potentially fatal fall, People reports. When a 60-year-old florist in New Jersey tripped and hit her head in her studio, she lost consciousness and awoke heavily bleeding. With nobody around to call for help, she realized she had her AirPods in, and used a "Hey Siri" command to call 911. An operator was able to stay on the ...
iphone 13 earpods

Apple to Stop Including EarPods With Every iPhone Sold in France From Next Week

Friday January 21, 2022 3:21 am PST by
Apple will no longer include EarPods with every iPhone sold in France, starting on January 24, according to a notice posted by a French carrier (via iGeneration). Apple was previously required to include EarPods in the box with the iPhone due to a French law that required every smartphone sold in the country to come with a "handsfree kit," but the law has now been changed in favor of reducing the ...
peloton tv workout cardio

Apple Floated as Potential Buyer of Peloton

Friday January 21, 2022 6:11 am PST by
Following months of bleak news about Peloton's "precarious state," including the revelation that it has halted production of its bikes and treadmills, Apple is being floated as a potential buyer of Peloton's troubled fitness business. Yesterday, CNBC reported that Peloton will temporarily stop production of its connected fitness products due to a "significant reduction" in consumer demand, a ...
Questionable Design Decisions

Apple's Most Questionable Design Decisions in Recent Memory

Sunday January 23, 2022 2:59 am PST by
Apple has always emphasized the depth of thought that goes into the design of its products. In the foreword to Designed by Apple in California, a photo book released by the company in 2016, Jony Ive explains how the company strives "to define objects that appear effortless" and "so simple, coherent and inevitable that there could be no rational alternative." But every once in a while even...
Spring 2022 Apple Products Feature

New iPad Air, Macs, and iPhone SE With 5G Likely to Be Announced at Apple Event This Spring

Thursday January 20, 2022 8:32 am PST by
Earlier this week, Bloomberg's Mark Gurman tweeted that Apple "will be holding a spring event" to announce a new iPhone SE and other hardware. In a recent edition of his newsletter, Gurman said the event is likely to occur in March or April. Gurman did not elaborate on what "other hardware" will be announced at Apple's purported spring event, but rumors suggest at least four products are...
Upcoming Products 2022 Feature

Gurman: Apple Preparing 'Widest Array of New Hardware Products in Its History' for Fall

Sunday January 23, 2022 10:32 am PST by
Apple is working on a number of new products that are set to launch this fall, and Bloomberg's Mark Gurman say that it will be "the widest array" of new devices that Apple has introduced in its history. In his latest "Power On" newsletter, Gurman explains that Apple is working on four new iPhones (iPhone 14, iPhone 14 Max, iPhone 14 Pro, and iPhone 14 Max), an updated low-end MacBook Pro, a...
apple watch series 7 aluminum colors yellowbg

Apple Watch Charging Bug Fixed in watchOS 8.4 Release Candidate

Thursday January 20, 2022 4:01 pm PST by
The watchOS 8.4 release candidate that was seeded to developers and beta testers this morning addresses an ongoing bug that could cause some Apple Watch chargers not to work properly with the Apple Watch. Back in December, we reported on a growing number of charging issues that Apple Watch Series 7 owners were facing. Since watchOS 8.3, there have been a number of complaints about...
safari icon blue banner

macOS Monterey 12.2 and iOS 15.3 Release Candidates Fix Safari Bug That Leaks Browsing Activity

Thursday January 20, 2022 1:30 pm PST by
The macOS Monterey 12.2 and iOS 15.3 release candidates that came out today appear to address a Safari bug that could cause your recent browsing history and details about your identity to be leaked to malicious entities. As shared last week by browser fingerprinting service FingerprintJS, there is an issue with the WebKit implementation of the IndexedDB JavaScript API. Any website that uses...
apple college discounts

Apple Walks Back UNiDAYS Verification Requirement for U.S. Education Store

Friday January 21, 2022 12:43 pm PST by
Earlier this week, Apple began requiring that customers taking advantage of educational discounts in the United States verify their status as a teacher, student, or school staff member through UNiDAYS. The requirement was a major change as Apple had never asked customers to go through a verification process in the United States before, and now, just three days after verification was added,...