The cable channel will shortly announce that the series, which stars Michael C. Hall as serial killer Dexter Morgan, has been renewed, according to The Hollywood Reporter.
The show's most recent episode, 'In The Beginning', attracted a season high of 2.5m viewers, up 43 per cent from the fifth season premiere.
In 2008, Showtime renewed the drama for two additional seasons. However, this year's renewal is expected to be for a single run, since cast contracts will expire at the conclusion of a sixth season.
An official confirmation on the new commission is expected in the coming weeks.
The fifth season of Dexter concludes on December 12.