Tenn. Code Ann. § 67-3-613: Bond replacement

(a) If, at any time after the execution of any surety bond, the surety or sureties on the bond become insolvent, the commissioner may require the execution of a new bond with good and solvent surety in the same manner and with the same penalty as the bond being replaced. The bond shall be subject to the approval of the commissioner.

(b) Any person executing a bond under this part may, at any time prior to default under any existing bond, apply to the commissioner for leave to cancel the existing bond and file a new bond with a new surety.