OnePlus One owners, OnePlus would like you to know that you haven't been left out in the cold. An update is out for your device that bumps it to OxygenOS 2.1.4. This update is near identical to the version on the OnePlus Two, except it's missing MaxxAudio and relevant apps, the manual camera mode, RAW file format capability, fingerprint support (obviously), and the screen temperature slider. Also, it's not going out as an over-the-air update.
You see, OnePlus calls this a community-sourced ROM. That means the experience won't be all that different from using other Android ROMs that come from the community. You will have to manually flash the update, and you must use OnePlus's custom recovery to do so. Using TWRP will result in losing your radio and IMEI. Even worse, that would mean having to contact OnePlus customer support.
OxygenOS 2.1.4 comes with Android 5.1.1. Marshmallow, this is not. So you have to ask yourself, is it worth the effort?
Download instructions are available at the link below.