Methods and systems for transforming a text-independent enrolment of a customer into a text-dependent enrolment are provided. A request for authentication of a customer that is enrolled in the self-service system with a text-independent voice print is received. A request is transmitted to the customer to repeat a passphrase and the customer's response is received as an audio stream of the passphrase. The customer is authenticated by comparing the audio stream of the passphrase against the text-independent voice print and if the customer is authenticated then a text-dependent voice print is created based on the passphrase. Upon receipt of a subsequent request for authentication of the customer, a request may be transmitted to the customer to repeat the passphrase. Another audio stream of the passphrase may be received. The customer may be authenticated by comparing the another audio stream of the passphrase with the text-dependent voice print.