It’s been a long while since Apple has issued a substantive update to its 21.5-inch iMac, but newly revealed data strings tucked away in the most recent OS X El Capitan beta suggests that that may change soon.

Originally spotted by 9to5Mac, Mark Gurman reports that the second beta of OS X 10.11, released to developers just this week, references Mac support for a varying number of display resolutions, one of which points to an upcoming 21.5-inch iMac with a 4K display.

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“Likely destined for a refreshed version of the 21.5-inch iMac, which currently does not have a Retina display, the new El Capitan beta references Mac support for a new 4096 x 2304 resolution Apple-made display panel,” Gurman reports.

Remarkably, the last time we see a notable refresh on the 21.5-inch iMac was all the way back in the fall of 2013. Since then, Apple managed to release an entry level iMac along with a 27-inch iMac with Retina 5K display. All the while, Apple’s most popular iMac model was effectively ignored..

But in light of the aforementioned evidence pointing to a 4K 21.5-inch iMac, it stands to reason that we might finally see a long-awaited update to Apple’s consumer-oriented desktop sometime this fall, just in time to get potential supply issues ironed out ahead of the busy 2015 holiday shopping season.

A life long Mac user and Apple enthusiast, Yoni Heisler has been writing about Apple and the tech industry at large for over 6 years. His writing has appeared in Edible Apple, Network World, MacLife, Macworld UK, and most recently, TUAW. When not writing about and analyzing the latest happenings with Apple, Yoni enjoys catching Improv shows in Chicago, playing soccer, and cultivating new TV show addictions, the most recent examples being The Walking Dead and Broad City.