Ottawa's CityFolk Festival has announced that Jason Isbell and the 400 Unit have cancelled their headline appearance this weekend.

"Regrettably, Jason Isbell and the 400 Unit must cancel their CityFolk show due to illness," the festival said.

"All ticket purchasers holding a single-day ticket for Sept. 15 or Pick-3 pass including Sept.15, will receive further details as soon as possible."

Isbell was to be the headline act of the final night of the festival.

Maren Morris, Alejandro Escovedo, and Billianne, and Sonia G. remain on the schedule for Sept. 15.

Morris will now be closing the TD Stage. Escovedo’s set has been moved to the TD Stage at 7:10 p.m.