“You can’t stop the work.”— The Expanse (@ExpanseOnPrime) November 24, 2020
Season 6 is a go. pic.twitter.com/ayk93DChGm
EDIT: Variety and Deadline both reporting it's the final season.
‘The Expanse’ Renewed for Sixth and Final Season at Amazon https://t.co/PrG3LOCsvV— Variety (@Variety) November 24, 2020
Per the article: “We’d like to thank Naren, Andrew, Broderick, everyone at Alcon and the entire cast and crew of ‘The Expanse’ for the hard work and love they have put into the series over these past seasons,” said Vernon Sanders, co-head of television for Amazon Studios. “We’re very happy we can give the incredibly loyal and passionate fans of ‘The Expanse’ the satisfying conclusion to the series that they deserve. We know they’ll love how Seasons Five and Six unfold.”
SOURCES: #1, #2
Well... This is disappointing. I bet it's because of the whole Cas situation.