See also
http://devilry.readthedocs.org/en/latest/releasenotes-1.3.3.html
BACKUP. YOUR. DATABASE. AND. FILES.
Update REVISION to v1.3.3 using the instructions in the update guide
REVISION
v1.3.3
Migrating from 1.3.1, 1.3.2 or 1.3.3 to 1.3.4
Migrating from 1.3.1 to 1.3.2