OnePlus 8, OnePlus 8 Pro, and OnePlus 8T are getting a new OxygenOS update. The latest update brings the October 2021 security patch, bug fixes, and other minor improvements to the three handsets. OnePlus confirmed that the update is rolling out in a staggered manner.

source https://gadgets.ndtv.com/mobiles/news/oneplus-8-8t-pro-oxygenos-update-october-2021-android-security-patch-changelog-2582778#rss-gadgets-all