Version 0.9.11 is a security and bug fix version that incorporates the security and bug fixes introduced in WordPress 0.9.10 into the 0.9 line. The WordPress page describes the changes as following
These changes include a pair of security fixes that handle how comments are filtered and then stored in the database.
The changes were incorporated “as is” and there are no further impacts to calmPress.
Get the full install of 0.9.11 or the upgrade.