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
sugargliderdude
32 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
jb-net
32 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
pavvel
32 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
VanNess
32 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
macintoshmac
32 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
Steve121178
32 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)
Read All Comments

Popular Stories

macbook air m2

Exclusive: Apple Plans to Launch MacBook Air With M2 Chip on July 15

Wednesday June 29, 2022 5:23 pm PDT by
The redesigned MacBook Air with the all-new M2 Apple silicon chip will be available for customers starting Friday, July 15, MacRumors has learned from a retail source. The new MacBook Air was announced and previewed during WWDC earlier this month, with Apple stating availability will begin in July. The MacBook Air features a redesigned body that is thinner and lighter than the previous...
Read Full Article • 304 comments
original iphone 2007

15 Years Ago Today, the iPhone Went On Sale

Wednesday June 29, 2022 4:43 am PDT by
Fifteen years ago to this day, the iPhone, the revolutionary device presented to the world by the late Steve Jobs, officially went on sale. The first iPhone was announced by Steve Jobs on January 9, 2007, and went on sale on June 29, 2007. "An iPod, a phone, an internet mobile communicator... these are not three separate devices," Jobs famously said. "Today, Apple is going to reinvent the...
Read Full Article • 240 comments
maxresdefault

Video Comparison: M2 MacBook Pro vs. M1 MacBook Pro

Tuesday June 28, 2022 2:45 pm PDT by
Apple last week launched an updated version of the 13-inch MacBook Pro, and it is the first Mac that is equipped with an updated M2 chip. As it's using a brand new chip, we thought we'd pick up the M2 MacBook Pro and compare it to the prior-generation M1 MacBook Pro to see just what's new. Subscribe to the MacRumors YouTube channel for more videos. For the video comparison, we're using the...
Read Full Article • 78 comments
iPhone vs Galaxy Larger

Apple Executive Says Samsung Copied the iPhone and Simply 'Put a Bigger Screen Around It'

Tuesday June 28, 2022 8:59 am PDT by
The Wall Street Journal's Joanna Stern today shared a new documentary about the evolution of the iPhone ahead of the 15th anniversary of the device launching on June 29, 2007. The documentary includes an interview with Apple's marketing chief Greg Joswiak, iPhone co-creator Tony Fadell, and a family of iPhone users. One segment of the interview reflects on Android smartphones gaining larger...
Read Full Article • 115 comments
iPhone 11 Pro vs iPhone 14 Pro

iPhone 11 Pro vs. 14 Pro: New Features to Expect if You've Waited to Upgrade

Monday June 27, 2022 11:22 am PDT by
With many customers choosing to upgrade their iPhone every two or three years nowadays, there are lots of iPhone 11 Pro users who might be interested in upgrading to the iPhone 14 Pro later this year. Those people are in for a treat, as three years of iPhone generations equals a long list of new features and changes to look forward to. Below, we've put together a list of new features and...
Read Full Article • 163 comments
Mac Studio IO

Apple Begins Selling Refurbished Mac Studio Models

Thursday June 30, 2022 7:42 pm PDT by
Apple today began selling refurbished Mac Studio models for the first time in the United States, Canada, and select European countries, such as Belgium, Germany, Ireland, Spain, Switzerland, the Netherlands, and the United Kingdom. In the United States, two refurbished Mac Studio configurations are currently available, including one with the M1 Max chip (10-core CPU and 24-core GPU) for...
Read Full Article • 86 comments
rootbug

Major macOS High Sierra Bug Allows Full Admin Access Without Password - How to Fix [Updated]

Tuesday November 28, 2017 12:33 pm PST by
There appears to be a serious bug in macOS High Sierra that enables the root superuser on a Mac with a blank password and no security check. The bug, discovered by developer Lemi Ergin, lets anyone log into an admin account using the username "root" with no password. This works when attempting to access an administrator's account on an unlocked Mac, and it also provides access at the login...
Read Full Article • 684 comments