OnePlus is now rolling out OxygenOS updates for the OnePlus 8 and the OnePlus 8 Pro in NA, EU and Indian markets. These updates bring a host of improvements and bug fixes that should take care of most of the issues discovered so far. The OnePlus 8 Pro gets the more substantial update. The version number for the update is 10.5.11 for NA and India and 10.5.10 for EU. Meanwhile, the OnePlus 8 also gets most of the same changes, minus ones specific to the hardware on the 8 Pro. The version numbers here are 10.5.8 for EU, 10.5.9 for India and 10.5.10 for NA. You can read through all the changes...
Source: https://www.gsmarena.com/oneplus_releases_oxygenos_updates_for_the_oneplus_8_and_the_oneplus_8_pro-news-44171.php