"Sad news. One more injured woman, born in 1966, died in emergency hospital №1. I convey condolences to her family and friends. As I promised, I will later provide more details on financial support for those affected by the incident," Gusev wrote on Telegram.
The health ministry said earlier that 19 people were injured in the incident.
A shuttle bus exploded near a shopping mall in Voronezh on Thursday.