Per notice that an upgrade was available,
Movable Type Publishing Platform: Movable Type 3.14 released:
We have just released Movable Type v3.14 which fixes the issue of extreme loads witnessed on servers under the strain of a massive spam attack. Because these attacks are increasing in both frequency and severity, we strongly recommend that all Movable Type users install this update. This is particularly important for any installation that is visible to the public on the web.
Being a new movabletype user, I wasn't sure exactly what to do, and whether I installed everything correctly. I might have:
Upgrading your databases: Running ......Done upgrading your schema! All went well.
and
Upgrade seems to have been successful.
But if anything weird happens, I didn't do it.