Apple Seeds First OS X 10.11.3 El Capitan Beta to Developers - MacRumors
Skip to Content

Apple Seeds First OS X 10.11.3 El Capitan Beta to Developers

Apple today seeded the first beta of an upcoming OS X 10.11.3 El Capitan update to developers for testing purposes, just over one week after releasing the second OS X El Capitan update, OS X 10.11.2. OS X 10.11.2 was a minor update that introduced several bug fixes and performance improvements for Wi-Fi connectivity, Handoff, and Airdrop.

The new OS X 10.11.3 beta, build 15D9c, can be downloaded through the Apple Developer Center.

10_11_3_beta_1
It is not known what improvements the third update to OS X El Capitan will bring, but like prior updates, it's likely to focus on security enhancements, performance improvements, and bug fixes to address issues have been discovered since the release of OS X 10.11.2.

We'll update this post with any changes that are discovered in the beta.

Related Forum: OS X El Capitan

Popular Stories

iPhone Handoff iOS 27 Feature

T-Mobile to Charge $5 a Month for iOS 27 iPhone Handoff

Thursday September 10, 2026 3:58 pm PDT by
T-Mobile will charge customers $5 per month to use iPhone Handoff, an e-SIM feature that allows the same phone number to be used on two separate iPhones. iPhone Handoff requires carrier support, and at launch, only T-Mobile users in the U.S. and Deutsche Telekom users in Germany will be able to use it. T-Mobile says customers can use their number across two compatible iPhone models and...
iphone duo

IMAX Reacts to iPhone Duo's 1:1.4 Aspect Ratio Displays

Friday September 11, 2026 4:42 am PDT by
Production theater company IMAX has responded in a mixed way to Apple's embrace of a 1:1.4 aspect ratio on the iPhone Duo's inner and outer displays. The boxier ratio happens to be very close to the classic "full-frame" IMAX 1.43:1 aspect ratio, which comes from the geometry of the company's original 15-perforation/70mm film system. In response to an X post from someone wondering if we'll see...
deep black iphone 18 pro

Apple Says iPhone 18 Pro Max Sold in U.S. Differs in One Way

Saturday September 12, 2026 3:27 pm PDT by
As noted by Nicolas Lellouche, who writes for the French tech website Numerama, Apple has updated its tech specs pages for the iPhone 18 Pro and iPhone 18 Pro Max to clarify which models are equipped with its new C2 cellular modem and where. Apple now says the iPhone 18 Pro has a C2 modem worldwide, while the iPhone 18 Pro Max uses the chip in every country except for the U.S. According...

Top Rated Comments

140 months ago
Here comes another useless beta which will fix nothing even if one reports the bug to Apple...
Score: 10 Votes (Like | Disagree)
Asclepio Avatar
140 months ago
can anyone tell me if this fixes the issue that it sucks at being an OS?
Score: 8 Votes (Like | Disagree)
140 months ago
They must have outsourced Mail and Preview dev to India. They just can't seem to get it right.
As if people could only write a bad code in India and not elsewhere...Get a life.
Score: 7 Votes (Like | Disagree)
Traverse Avatar
140 months ago
Fix Preview which is been broken since the initial release. PDF still render pixelated especially if you resize the window, and it still uses ridiculous amounts of RAM.
Score: 7 Votes (Like | Disagree)
xgman Avatar
140 months ago
After the series of usb beta problems with 10.11.2 betas, I am afraid of Apple betas. I used to be first on board with these but they seem to be pushing more and more experimental changes under the hood that are not readily apparent. I wonder what's up with this series....

On another matter, how do they coordinate all of these betas for ios and osx to now always come out about the same day? Do they give each team the same deadline . . ready or not .. go?
Score: 6 Votes (Like | Disagree)
thefredelement Avatar
140 months ago
Can anyone tell me if this fixes the 4k screen sleep/wake issue?
Score: 4 Votes (Like | Disagree)