Apple Seeds Second OS X 10.11.3 El Capitan Beta to Developers and Public Beta Testers

Apple today seeded the second beta of an upcoming OS X 10.11.3 El Capitan update to developers and public beta testers for testing purposes, three weeks after seeding the first OS X 10.11.3 beta and a month after releasing OS X 10.11.2.

The second OS X 10.11.3 beta, build 15D13b, can be downloaded through the Apple Developer Center or via the Software Update Mechanism in the Mac App Store for those who installed the first beta.

os_x_el_capitan_roundup
The first beta of OS X 10.11.3 did not include any noticeable outward-facing changes, suggesting the update will focus on security enhancements, performance improvements, and bug fixes to address issues that have been discovered since the release of OS X 10.11.2. Prior OS X El Capitan updates have also focused mainly on under-the-hood improvements.

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

Related Forum: OS X El Capitan

Popular Stories

m1 chip slide

Five Years of Apple Silicon: M1 to M5 Performance Comparison

Monday November 10, 2025 1:08 pm PST by
Today marks the fifth anniversary of the Apple silicon chip that replaced Intel chips in Apple's Mac lineup. The first Apple silicon chip, the M1, was unveiled on November 10, 2020. The M1 debuted in the MacBook Air, Mac mini, and 13-inch MacBook Pro. The M1 chip was impressive when it launched, featuring the "world's fastest CPU core" and industry-leading performance per watt, and it's only ...
All Screen iPhone 2027 Feature 1

Apple to Hide Selfie Camera Under Display of 20th Anniversary iPhone

Monday November 10, 2025 1:55 am PST by
Apple will conceal the front-facing camera under the screen of its 2027 iPhone, a Chinese leaker said today, corroborating reports that Apple's 20th anniversary iPhone will have no visible cutouts in the display. Weibo-based account Digital Chat Station said Apple's development of under-screen camera technology was progressing as planned for adoption in 2027, one year after it will...
iphone air thinness

iPhone Air Sales Are So Bad That Apple's Delaying the Next-Generation Version

Monday November 10, 2025 11:41 am PST by
The thin, light iPhone Air sold so poorly that Apple has decided to delay the launch of the next-generation iPhone Air that was scheduled to come out alongside the iPhone 18 Pro, reports The Information. Apple initially planned to release a new iPhone Air in fall 2026, but now that's not going to happen. Since the iPhone Air launched in September, there have been reports of poor sales...
iphone pocket%402x

Apple Debuts iPhone Pocket, a Limited Edition iPod Sock-Style Accessory

Tuesday November 11, 2025 1:23 am PST by
Apple has teamed up with Japanese fashion house ISSEY MIYAKE to launch iPhone Pocket, a 3D-knitted limited edition accessory designed to carry an iPhone, AirPods, and other everyday items. The accessory is like a stretchy pocket, not unlike an iPod Sock, but elongated to form a strap made of a ribbed, elastic textile that fully encloses an iPhone yet allows you to glimpse the display...
Early Black Friday Deals 1

The Best Early Black Friday Apple Deals on AirPods, Apple Watch, iPad, and More

Saturday November 8, 2025 6:16 am PST by
We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...
iOS 26

iOS 26.2 Available Next Month With These 8 New Features

Tuesday November 11, 2025 9:48 am PST by
Apple released the first iOS 26.2 beta last week. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date....
Apple fitness plus feature

Future of Apple Fitness+ 'Under Review'

Sunday November 9, 2025 5:30 am PST by
The future of Apple Fitness+ is "under review" amid a reorganization of the service, according to Bloomberg's Mark Gurman. In the latest edition of his "Power On" newsletter, Gurman said that Apple Fitness+ remains one of the company's "weakest digital offerings." The service apparently suffers from high churn and little revenue. Nevertheless, Fitness+ has a small, loyal fanbase that...
homepod mini colors

New HomePod Mini Coming Soon With These Features

Tuesday November 11, 2025 7:30 am PST by
Apple is expected to announce a new HomePod mini imminently, headlining with new chips. Here are all of the new features we're expecting. The second-generation HomePod mini is highly likely to contain a more up-to-date chip for more advanced computational audio and improved responsiveness. The current HomePod mini is equipped with the Apple Watch Series 5's S5 chip from 2019. Apple is likely ...
2024 iPhone Boxes Feature

Apple Adjusts Trade-In Values for iPhones, iPads, Macs, and More

Thursday November 6, 2025 11:12 am PST by
Apple today updated its trade-in values for select iPhone, iPad, Mac, and Apple Watch models. Trade-ins can be completed on Apple's website, or at an Apple Store. The charts below provide an overview of Apple's current and previous trade-in values in the U.S., according to its website. Maximum values for most devices either decreased or saw no change, but the iPad Air received a slight bump. ...
iphone black friday gold

The Best Early Black Friday iPhone Deals

Monday November 10, 2025 10:18 am PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2025 sales have kicked off at AT&T, Verizon, T-Mobile, and more. Right now we're tracking notable offers on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air. For even more savings, keep an eye on older models during the holiday shopping season. Note: MacRumors is...

Top Rated Comments

Chase R Avatar
129 months ago
Running strong on my original 2008 aluminum MacBook. This thing just won't die.
Score: 7 Votes (Like | Disagree)
Max(IT) Avatar
129 months ago
Running strong on my original 2008 aluminum MacBook. This thing just won't die.
Great series, especially with an SSD and 8 Gb of ram installed

I never see the loading bar in the indexing box, but that's the least of my worries. Apple ignored my reports about MAIL corruption, Bluetooth crashes that required shutting the machine down. So what did Apple do in response to my constant complaints. My Apple ID no longer works correctly. Sure, I file reports but they fall on deaf ears. No response. AND, publicly as announced here, they renounced any support for Mac models including mine that are in the system list for Macs certified to run El Capitan! If that's not lame I don't know what is.
It looks like I'm going to have to do another complete reinstall again from Mavericks.

THANK YOU MAVERICKS! Without lowly Mavericks, I would have probably lost THOUSANDS of important emails.

This update has solved nothing about my Mac not be certified with my Apple ID either nor does it fix any mail problems.

Looks like I'll start from scratch all over again. Apple has really let Mac OS go. It's sad really. And worse yet, they don't seem to care. :-(
If your mails are so valuable then I strongly suggest you not to use betas....
Score: 3 Votes (Like | Disagree)
PowerBook-G5 Avatar
129 months ago
That's pretty quick, so you must have approximately 65Mbps internet speeds?
I think people only say how long it took to download so they can boast about their connection speeds.
Score: 2 Votes (Like | Disagree)
jmgregory1 Avatar
129 months ago
As the afternoon has worn on, I've watched emails disappear from Mail, then re-appear within a couple of minutes, so this didn't fix the problem. Even on the non-beta, I was having this problem and can say that both of the recent beta updates seemed to improve the situation, but it's still a problem - unfortunately.
Score: 2 Votes (Like | Disagree)
jonnysods Avatar
129 months ago
Please reduce the beach balls and apps that don't seem to load. Messages just bounces in the dock until I force quit and reload, even after a fresh install.

I miss Yosemite.
Score: 2 Votes (Like | Disagree)
Ebenezum Avatar
129 months ago
This to me means that the changes are just too embarrassing to list.
I had the same thought but I try to be more optimistic (which is very hard given the number of bugs in 10.11.2).

Probably it's a placebo update, will be released for the sake of releasing but not fixing any longstanding issues...
I'm afraid that is going to happen. At this rate I'm fairly certain it will take at least 10.11.4 or .5 before Apple fixes Time Machine failure to restore files that I reported during beta testing... :mad:

I just hope some good changes are made for disk utility
One can hope but I'm fairly certain hell will freeze over before that happens... :(

THANK YOU MAVERICKS! Without lowly Mavericks, I would have probably lost THOUSANDS of important emails.

This update has solved nothing about my Mac not be certified with my Apple ID either nor does it fix any mail problems.

Looks like I'll start from scratch all over again. Apple has really let Mac OS go. It's sad really. And worse yet, they don't seem to care. :-(
I had a similar situation and I didn't lost any emails because I tested 10.11 on external drive and stopped using it moment I noticed the Mail problem.

I'm going to stay in Mavericks for the foreseeable future because 10.10 and 10.11 have no benefits for me and both contain too many bugs and baffling design decisions.

It seems certain Apple no longer cares about OS X. :mad:
Score: 2 Votes (Like | Disagree)