The Australian Prudential and Regulation Authority (APRA) will require Medibank Private to hold 250 million Australian dollars (U.S. $166 million) in extra capital until the insurer remediates identified cybersecurity weaknesses after a significant data breach.

The action by APRA, announced Tuesday, follows a cyber incident last year in which 9.7 million past and present Medibank customers had their data stolen by a hacker. The data exposed included first and last names, addresses, dates of birth, Medicare numbers, policy numbers, phone numbers, and some claims data.