You cannot…you must use whatever MySQL DB version is bundled with the firmware.
It is a shame that WD bundles such an ancient (5+ yr old) version of MySQL that was released wayy back in Feb 2011 (go here and select that version to see for yourself → https://downloads.mysql.com/archives/community/ ). I have raised this issue of stale versions of bundled software for the past couple years, but nothing has changed on this aspect.
