Security is an ongoing back-and-forth. We make advancements, and the bad guys do, too, too. The work is never done here at LastPass. Its important to stay ahead of the game, so were constantly evolving. Weve implemented dozens of other changes, large and small, to strengthen our systems and improve the systems going forward. We’re adding scrypt as an additional layer to strengthen the authentication hashes server-side, adding further protection against large-scale brute-force attacks.”]
Source: https://blog.lastpass.com/2015/06/lastpass-security-notice/