OnePlus has today confirmed that all three of the smartphones in its lineup are getting Android 6.0 Marshmallow upgrades.

The bad news is that you’ll have to wait until the first quarter of 2016 to get them for the OnePlus One and the OnePlus 2, and there’s no release schedule at all for OnePlus X yet.

Given that OxygenOS, the software that powers OnePlus devices, is pretty close to pure Android, it’s somewhat surprising that its Marshmallow upgrades are taking so long. The software made its public debut in early October, but Google would have made it available to partners before then.

What’s more, the OnePlus One’s update won’t even be build by OnePlus; the device will continue to run Cyanogen OS by default, the company explained in an announcement on its blog.

“We created a community build of OxygenOS for the OnePlus One, but this isn’t what the product officially ships with,” reads the announcement on its forum. “We will be updating the community build of OxygenOS for the OnePlus One when time allows.”

The OnePlus 2’s update will, of course, by the latest OxygenOS release, and it will take advantage of Marshmallow’s new fingerprint sensor API. There’s no word on what else it will bring, but we can expect to see Marshmallow additions like Doze, new app permissions, and more.

As for the new OnePlus X, OnePlus says it is “working hard to bring Marshmallow as soon as possible to the OnePlus X, and will update you on a time frame at a later time.” It’s unclear whether that means the update could drop before the OnePlus 2 gets it, but that seems unlikely.

OnePlus promises to keep delivering OxygenOS updates in the meantime to fix bugs and make improvements, and we’ll keep you updated on the progress of its Marshmallow upgrades.

• SourceOnePlus