The WordPress group just released a update that was partly issued to resolved a security concern.
There was some updates done as well with some nice new features.
Check out their post here for the full details:
Some sites were already updated that are on our hosting platform. Some of you chose to not
do the auto upgrade I am sure, so please check into upgrading your software accordingly.
If you don't know what to do then contact support for more information and someone will gladly
help you get that done.
Tuesday, April 21, 2015