IEM Oakland will be played on patch 6.21 according to a source at ESL.

Patch 6.22 launched on Nov. 10 as the first patch of the 2017 preseason. The patch most notably includes a rework for Assassins, mastery changes and a rework of the jungle.

ESL recently announced that the event will only feature six teams, as opposed to the eight that were originally scheduled to compete. Flash Wolves, Longzhu Gaming, The Chiefs eSports Club, INTZ e-Sports, Unicorns of Love and Team SoloMid will participate in the event, which will feature two groups of three teams each.

IEM Oakland is set to run from Nov. 19-20 at the Oracle Arena in Oakland, Ca.

Preston Dosza is a news editor for theScore esports. You can follow him on Twitter.