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
22 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
22 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
22 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
22 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
22 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
22 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)

Top Stories

apple california streaming event

Apple Event Announced: 'California Streaming' on September 14 With iPhone 13, Apple Watch Series 7 Expected

Tuesday September 7, 2021 9:03 am PDT by
Apple today announced that it will be holding a special event on Tuesday, September 14 at 10:00 a.m. The event will take place at the Steve Jobs Theater on the Apple Park campus in Cupertino, California. As with WWDC and last year's fall events, this new event will be held digitally with no members of the media invited to attend in person. Apple will likely provide pre-taped segments for...
iphone 12 colors 2021

iPhone 12 Colors: Deciding on The Right Color

Thursday November 5, 2020 8:35 am PST by
The iPhone 12 and iPhone 12 Pro arrived in October 2020 in a range of color options, with entirely new hues available on both devices, as well as some popular classics. The 12 and 12 Pro have different color choices, so if you have your heart set on a particular shade, you might not be able to get your preferred model in that color. iPhone 12 mini and iPhone 12 The iPhone 12 mini and iPhone...
studio buds family

Beats Studio Buds Debuting Today With Active Noise Cancellation, Stemless Design, and More for $150

Monday June 14, 2021 8:00 am PDT by
We've seen a lot of teasers about the Beats Studio Buds over the past month since they first showed up in Apple's beta software updates, and today they're finally official. The Beats Studio Buds are available to order today in red, white, and black ahead of a June 24 ship date, and they're priced at $149.99. The Studio Buds are the first Beats-branded earbuds to truly compete with AirPods...
youtube apple tv

YouTube Discontinuing 3rd-Generation Apple TV App, AirPlay Still Available

Wednesday February 3, 2021 3:09 pm PST by
YouTube is planning to stop supporting its YouTube app on the third-generation Apple TV models, where YouTube has long been available as a channel option. A 9to5Mac reader received a message about the upcoming app discontinuation, which is set to take place in March.Starting early March, the YouTube app will no longer be available on Apple TV (3rd generation). You can still watch YouTube on...
maroon5memories

Apple Collaborates With Maroon 5 to Add 'Memories' Song to Photos App

Wednesday September 25, 2019 12:02 pm PDT by
Apple has teamed up with Maroon 5 to add the group's new song "Memories" to the Memories feature in the Photos app, allowing it to be used for photo slide show creations, reports Billboard. "Memories" will be available as a soundtrack option for a limited time and it is available to iPhone and iPad users running the latest iOS 13 and iPadOS software. Memories in the Photos app are created ...
affinity designer contour tool

Serif Updates Affinity Photo, Designer, and Publisher With New Tools and Functions

Thursday February 4, 2021 1:58 am PST by
Serif today announced across-the-board updates for its popular suite of Affinity creative apps, including Affinity Photo, Affinity Designer, and the Apple award-winning Affinity Publisher for Mac, all of which were among the first professional creative suites to be optimized for Apple's new M1 chip. "After another year which saw record numbers of people switching to Affinity, it's exciting to...
original iphone

Phil Schiller Says iPhone Was 'Earth-Shattering' Ten Years Ago and Remains 'Unmatched' Today

Monday January 9, 2017 7:15 am PST by
To commemorate the tenth anniversary of the iPhone, Apple marketing chief Phil Schiller sat down with tech journalist Steven Levy for a wide-ranging interview about the smartphone's past, present, and future. The report first reflects upon the iPhone's lack of support for third-party apps in its first year. The argument inside Apple was split between whether the iPhone should be a closed...
Top Stories 75 Thumbnail

Top Stories: Last-Minute iPhone 13 Rumors, Apple Announces App Store Changes, and More

Saturday September 4, 2021 6:00 am PDT by
The finish line is in sight! Apple's annual iPhone event is likely just a week or so away and all eyes will be on the company as it unveils the next version of its most popular product line. With any luck, we'll also see the next-generation Apple Watch and perhaps even some new AirPods. Other news this week saw Apple making some more changes to its App Store policies in response to a...
Top Stories 74 Thumbnail

Top Stories: iPhone 13 Nears Launch, Larger Apple Watch?, MacBook Pro and Mac Mini Rumors

Saturday August 28, 2021 6:00 am PDT by
August is rapidly drawing to close, which means Apple's annual iPhone launch event is right around the corner. iPhone 13 and Apple Watch Series 7 rumors are continuing to circulate, and we're also hearing about Mac updates likely coming a bit later. Apple is also finishing up work on its upcoming software updates like iOS 15, with some late-addition features starting to go live in beta while ...
iPhone 13 Wi Fi 6E feature update

Wi-Fi 6E Explained: What It Could Mean for iPhone 13 and Beyond

Monday August 2, 2021 8:00 am PDT by
The iPhone 13 is widely expected to come with Wi-Fi 6E capabilities, and while it may seem rather nuanced to the average consumer, with only improved speeds and being "up to date" in the realm of Wi-Fi technology, it's actually a fairly significant improvement, laying the groundwork for much of what we know the future holds. To truly understand Wi-Fi 6E, MacRumors sat down for an exclusive...