Check ballast-security-securing-hashing plugin.
This plugin seamlessly changes your stored password hash to a far stronger one. The hash that it is changed to is generated with a modified PBKDF2 algorithm utilizing SHA-256, 16 bytes of salt and 2048 iterations, then a SHA-1 to meet size constraints. This plugin exponentially increases the strength of your stored password.
It will make your user base sleep in comfort and safety, not like SONY or Visa card users.