'''''Defiant''''' is the fourth book in the [[Skyward (series)|Skyward series]] and is scheduled to be released November 21, 2023.{{ref|name=releaseDate}}. It is the sequel to ''[[Cytonic (book)|Cytonic]]'',{{wob ref|14675}} and will connect the [[Skyward_(series)#Skyward_Flight_Novellas|Skyward Novellas]] to the central story.{{cite}}