Akismet was updated to version 2.5.7, from version 2.5.6. Changelog:
- FireFox Stats iframe preview bug
- Fix mshots preview when using https
- Add .htaccess to block direct access to files
- Prevent some PHP notices
- Fix Check For Spam return location when referrer is empty
- Fix Settings links for network admins
- Fix prepare() warnings in WP 3.5