We might have our sights on the OnePlus 9 series already but the brand is taking this time to support the older flagship in the market. If you happen to have either of the OnePlus 8 or OnePlus 8 Pro right now, you should be getting a notification for an update soon. The update brings fixes for 21 issues and also patches the device up to the March security model at the same time.
Note that this is a beta testing update so you might want to skip it. This is also the first time that the company will roll out the same beta that is going to the OnePlus 8T. However, this Oxygen OS beta 8 on the latter device only brought 19 fixes so the flagships have more to handle.
If you were on the previous beta build, you can easily access the OTA update. For those that have gone the stable way since, though, you would have to head into the OnePlus community to install the build manually.