I needed to upgrade MySQL from 5.5.x to 5.6.x on my OS X server running OS X Mavericks (10.9) and I found a site that basically made it super painless. Nothing jumped out on my from Google regarding Mavericks, so this is really for that random person like me who was unsure how it should work.
First, go download the 64-bit DMG of MySQL from here. Don’t worry that it says 10.7, it will work just fine with 10.9.
Then go here and read this page … I’ll wait, but don’t follow all the steps until you read my next part.
While performing the steps above, you’ll reach a step that reads:
At this step, instead of the above, try this instead:
/usr/local/mysql/bin/mysql_upgrade -u root -p
This will prompt you for your root password, but it will also allow the upgrade script to actually run. Otherwise, the directions were perfect and you should really have no problem. If for some reason you don’t have root access to MySQL … you’ll probably want to ask someone who does.