No, sorry, this is not currently possible. The design assumes that the most recent patch set is the one developers will review and test, and as such older patch sets can not be submitted. They also can not be reviewed/verified. If you want to use an older version of a patch set, you must re-submit it to make it the most recent patch set. To avoid no new changes error do git commit --amend and git will create a new sha1, which will be happily accepted by Gerrit as a new patch set.