How long did the Punic language remain in use in Carthage?

The Punic language, a later stage of the Phoenician language, remained in use in North Africa for several centuries following the destruction of Carthage by Rome in 146 BCE. While the city itself was razed, the language persisted as a vernacular in various North African regions. Historical evidence indicates that Punic continued to be spoken by North African peasants until the 6th century CE. Furthermore, it remained in use in some smaller North African cities at least until the time of St. Augustine, who served as the bishop of Hippo during the 5th century CE.12