Clarence Brothers seeks review of a final order denying his petition for writ of mandamus in which he challenged the calculation of gain-time. We grant respondent’s motion to dismiss the proceeding as moot. Because official records indicate that Mr. Brothers was released from prison during the pendency of this proceeding, the proceeding is moot. See Phillips v. McDonough, 962 So.2d 375 (Fla. 1st DCA 2007).