Apple Seeds Second OS X 10.11.3 El Capitan Beta to Developers and Public Beta Testers - MacRumors
Skip to Content

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

M5 MacBook Pro

RIP, MacBook Ultra

Monday October 19, 2026 9:37 am PDT by
Apple today sent out invites for an experience in Los Angeles on Wednesday, October 28, and the "Pro and tell" tagline on the invitation likely means that the rumored MacBook models with touch-enabled OLED displays will stick with MacBook Pro branding instead of the once-rumored "MacBook Ultra" name. The long-rumored "iPhone Ultra" ended up being named iPhone Duo, so speculation that Apple...
iPhone Duo Trio

Here's What Apple's Apps Look Like on the iPhone Duo

Tuesday October 20, 2026 11:12 am PDT by
With just three days to go until the iPhone Duo is released, Apple is getting ready for the launch. Behind the scenes, the App Store now has screenshots of Apple's built-in apps running on the Duo. We've seen some apps in marketing materials, but images of the ones we haven't seen give us an idea of what it will be like using the iPhone Duo day to day. Many apps are shown in landscape...
apple pro tell logo

Apple Announcing New Products Next Week: 'Pro and Tell'

Monday October 19, 2026 9:05 am PDT by
Apple's Greg Joswiak today hinted at new product announcements coming next week, sharing a social media post that says "Can't wait to pro and tell next week." Rumors suggest Apple is planning to debut the new MacBook Pro with an OLED touchscreen display, an M6 entry-level MacBook Pro, an M6 iMac, an iPad mini with an OLED display. Can't wait to pro and tell next week....

Top Rated Comments

Chase R Avatar
141 months ago
Running strong on my original 2008 aluminum MacBook. This thing just won't die.
Score: 7 Votes (Like | Disagree)
Max(IT) Avatar
141 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)
jasnw Avatar
141 months ago
I've not run into any of those issues. But that means nothing, as every machine is different.
And this is exactly what's so sad about Apple's inability to put out OS's that "just work" any more. As much as I dislike Windows, both Windows and Linux run on a far wider range of hardware than OS X and they don't seem to have the problems Apple has on its much narrower (and tightly controlled) range of hardware with simple things like mail, USB, and network connections (all of which use long-standing international standards in their hardware and software interfaces).
[doublepost=1452186310][/doublepost]I see a lot of "I hope they fixed X" in this thread and very little actual information about things that have or have not been fixed. Any actual experience with this beta release other than how long it took to download? Or maybe the lack of input from people running this beta is due to the fact that the new beta has broken the ability to connect to the Internet??? Just saying ...
Score: 2 Votes (Like | Disagree)
141 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)
jonnysods Avatar
141 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)
HiRez Avatar
141 months ago
For the love of all that is good an holy, please stop the beach balls!!

I get beach balls everywhere with El Capitan on 2011 MacBook Air, 2012 MacBook Pro, 2013 Mac Pro (8 core, 64 GB RAM, D500), 2015 Retina iMac. All with SSD, no hard disks. With Yosemite I rarely experienced beach balls. It's frustrating.
Score: 2 Votes (Like | Disagree)
Latest Stories
Giant iPhone Duo Displays Coming to Four Apple Stores
Giant iPhone Duo Displays Coming to Four Apple Stores
45 minutes ago
Apple Pulls Keynote, Pages and Numbers From App Store
Apple Pulls Keynote, Pages and Numbers From App Store
2 hours ago
Apple Updates More Apps With iPhone Duo Support
Apple Updates More Apps With iPhone Duo Support
2 hours ago
Apple Will Label Apps 'Made for iPhone Duo' in App Store
Apple Will Label Apps 'Made for iPhone Duo' in App Store
5 hours ago
Amazon Takes $49 Off iPad With Prices Starting at $399.99
Amazon Takes $49 Off iPad With Prices Starting at $399.99
6 hours ago
F1 on Apple TV Now Available in Dolby Atmos
F1 on Apple TV Now Available in Dolby Atmos
6 hours ago
Apple Reveals More Than 50 Apps That Will Be Updated for iPhone Duo
Apple Reveals More Than 50 Apps That Will Be Updated for iPhone Duo
7 hours ago
Apple Blocks Certificates That Could Help Attackers Fake Websites
Apple Blocks Certificates That Could Help Attackers Fake Websites
8 hours ago
Giant iPhone Duo Installations Spotted at Apple Fifth Avenue
Giant iPhone Duo Installations Spotted at Apple Fifth Avenue
9 hours ago
iPhone Duo 2 Prototypes Include Under-Display Face ID
iPhone Duo 2 Prototypes Include Under-Display Face ID
9 hours ago
Tesla App Gains iPad and iPhone Duo Support
Tesla App Gains iPad and iPhone Duo Support
13 hours ago
Apple Reportedly Boosts iPhone Duo Orders by 44%
Apple Reportedly Boosts iPhone Duo Orders by 44%
13 hours ago
Fortnite Returning to Australian App Store After Court Ruling
Fortnite Returning to Australian App Store After Court Ruling
14 hours ago
Apple Ordered to Open iPhone to Rival App Stores in Australia
Apple Ordered to Open iPhone to Rival App Stores in Australia
14 hours ago
Apple Suppliers Face Hurdles Cutting Circuit Board Emissions
Apple Suppliers Face Hurdles Cutting Circuit Board Emissions
14 hours ago
Things Updated for iPhone Duo With Adaptive Layout
Things Updated for iPhone Duo With Adaptive Layout
15 hours ago
Simplicity and Siri AI Are HomeView's Killer Features, Apple Says
Simplicity and Siri AI Are HomeView's Killer Features, Apple Says
15 hours ago
iPhone Duo Reviewers Really Miss Face ID
iPhone Duo Reviewers Really Miss Face ID
20 hours ago
Does the iPhone Duo Run Hot? Here's What Reviews Found
Does the iPhone Duo Run Hot? Here's What Reviews Found
22 hours ago
Apple Music's New Look is Now Live on Apple's Website
Apple Music's New Look is Now Live on Apple's Website
22 hours ago
Anthropic Launches Claude Duet, a Proactive AI Agent
Anthropic Launches Claude Duet, a Proactive AI Agent
23 hours ago
What 32,000 Folds Did to the iPhone Duo's Hinge
What 32,000 Folds Did to the iPhone Duo's Hinge
1 day ago
iPhone Duo's Hidden FaceTime Camera Takes 'Trash' Photos
iPhone Duo's Hidden FaceTime Camera Takes 'Trash' Photos
1 day ago
iPhone Duo Has 'Edge Light' Feature That Debuted on Macs Last Year
iPhone Duo Has 'Edge Light' Feature That Debuted on Macs Last Year
1 day ago
Apple Support App Updated for iPhone Duo's Larger Display
Apple Support App Updated for iPhone Duo's Larger Display
1 day ago
Amazon Sweetens the Deal on Entry-Level 16-Inch MacBook Pro With $570 Off
Amazon Sweetens the Deal on Entry-Level 16-Inch MacBook Pro With $570 Off
1 day ago
iPhone Duo Tips Over on MagSafe Stands When Unfolded
iPhone Duo Tips Over on MagSafe Stands When Unfolded
1 day ago
Apple Music's New Look Officially Announced
Apple Music's New Look Officially Announced
1 day ago
iPhone Duo Supports Apple Pencil Starting With iOS 27.2
iPhone Duo Supports Apple Pencil Starting With iOS 27.2
1 day ago
iPhone Duo Accessories Roundup: Cases and Screen Protectors From OtterBox, ZAGG, and More
iPhone Duo Accessories Roundup: Cases and Screen Protectors From OtterBox, ZAGG, and More
1 day ago