Apple Seeds Third Beta of Upcoming macOS Catalina 10.15.3 Update to Developers

Apple today seeded the third beta of an upcoming macOS 10.15.3 update to developers for testing purposes, one week after seeding the second beta and more than a month after releasing the macOS Catalina 10.15.2 update.

The new ‌‌macOS Catalina‌‌ beta can be downloaded using the Software Update mechanism in System Preferences after installing the proper software from the Developer Center.

macos catalina wallpaper
We don't yet know what improvements the third update to macOS Catalina will bring, but it will likely focus on performance improvements, security updates, and fixes for bugs that weren't able to be fixed in the macOS Catalina 10.15.2 update.

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.

We didn't find any other major new changes in the first two betas of macOS Catalina 10.15.3, but we'll update this post if there's anything new in the third beta.

Related Forum: macOS Catalina

Popular Stories

iPhone SE 4 Vertical Camera Feature

iPhone SE 4 Rumored to Use Same Rear Chassis as iPhone 16

Friday July 19, 2024 7:16 am PDT by
Apple will adopt the same rear chassis manufacturing process for the iPhone SE 4 that it is using for the upcoming standard iPhone 16, claims a new rumor coming out of China. According to the Weibo-based leaker "Fixed Focus Digital," the backplate manufacturing process for the iPhone SE 4 is "exactly the same" as the standard model in Apple's upcoming iPhone 16 lineup, which is expected to...
iPhone 16 Pro Sizes Feature

iPhone 16 Series Is Just Two Months Away: Everything We Know

Monday July 15, 2024 4:44 am PDT by
Apple typically releases its new iPhone series around mid-September, which means we are about two months out from the launch of the iPhone 16. Like the iPhone 15 series, this year's lineup is expected to stick with four models – iPhone 16, iPhone 16 Plus, iPhone 16 Pro, and iPhone 16 Pro Max – although there are plenty of design differences and new features to take into account. To bring ...
bsod

Crowdstrike Says Global IT Outage Impacting Windows PCs, But Mac and Linux Hosts Not Affected

Friday July 19, 2024 3:12 am PDT by
A widespread system failure is currently affecting numerous Windows devices globally, causing critical boot failures across various industries, including banks, rail networks, airlines, retailers, broadcasters, healthcare, and many more sectors. The issue, manifesting as a Blue Screen of Death (BSOD), is preventing computers from starting up properly and forcing them into continuous recovery...
iphone 14 lineup

Cellebrite Unable to Unlock iPhones on iOS 17.4 or Later, Leak Reveals

Thursday July 18, 2024 4:18 am PDT by
Israel-based mobile forensics company Cellebrite is unable to unlock iPhones running iOS 17.4 or later, according to leaked documents verified by 404 Media. The documents provide a rare glimpse into the capabilities of the company's mobile forensics tools and highlight the ongoing security improvements in Apple's latest devices. The leaked "Cellebrite iOS Support Matrix" obtained by 404 Media...
Apple Watch Series 9

2024 Apple Watch Lineup: Key Changes We're Expecting

Tuesday July 16, 2024 7:59 am PDT by
Apple is seemingly planning a rework of the Apple Watch lineup for 2024, according to a range of reports from over the past year. Here's everything we know so far. Apple is expected to continue to offer three different Apple Watch models in five casing sizes, but the various display sizes will allegedly grow by up to 12% and the casings will get taller. Based on all of the latest rumors,...
tinypod apple watch

TinyPod Turns Your Apple Watch Into an iPod

Wednesday July 17, 2024 3:18 pm PDT by
If you have an old Apple Watch and you're not sure what to do with it, a new product called TinyPod might be the answer. Priced at $79, the TinyPod is a silicone case with a built-in scroll wheel that houses the Apple Watch chassis. When an Apple Watch is placed inside the TinyPod, the click wheel on the case is able to be used to scroll through the Apple Watch interface. The feature works...

Top Rated Comments

AppleMatt Avatar
59 months ago
Good news with this update:

https://forums.macrumors.com/threads/psa-apple-mail-bugs-can-lead-to-data-loss-in-macos-catalina.2205346/post-28158834

Attachment Image
Score: 11 Votes (Like | Disagree)
ruslansv Avatar
59 months ago

And once again is the most important question: Has Apple finally fixed the Mail data loss bug?
Why does Apple stubbornly refuse to list what is fixed and what is not fixed (or targeted to a different release) via proper release notes (and not a joke of release notes they're providing)?
Score: 10 Votes (Like | Disagree)
macdos Avatar
59 months ago
It would be insanely great if Apple devotes some effort to maximize performance and minimize memory consumption. We should not have to rely on Macfanscontrol and Lingon to control fan speed and disable unncessary daemons, it should be builtin, as in Windows.
Score: 6 Votes (Like | Disagree)
grandchester Avatar
59 months ago
Hope it fixes the iCloud verification finally. Real tired of entering iCloud and Mac passwords AND the code on my iPhone for some reason every other day.
Score: 5 Votes (Like | Disagree)
sugargliderdude Avatar
59 months ago
think I'm going to install Catalina 10.15.3 once its released to the public
Score: 4 Votes (Like | Disagree)
bsbeamer Avatar
59 months ago
Really hope this release fixes the AMD 5XXX series drivers for MBP16,1 5500M and RX 5700 & RX 5700 XT in eGPU. Every video software vendor is pointing to those drivers as the reason for METAL issues with their software that disappear with RX580 or go software only.
Score: 4 Votes (Like | Disagree)