Ok, so this will happen every now and then, as new module releases come out. Aegir doesn't have any automatic way to upgrade Platform, but it can be done using Drush and a script. (The below guide is for updating modules only)
sudo aegir
cd /var/aegir/platforms/
rsync -av <current_platform>/ <new_platform>
cd <new_platform>/sites
rm -r <site1 site2 site3 ...> (clear all of the sites)
cd all
chown -R aegir:aegir <new_platform>/modules (just to make sure)
Log into Aegir, create new platform, verify
echo `ls modules` > mlist.txt
remove all the module folders
drush dl `cat mlist.txt`
do this: <a href="http://kostir.com/node/15">http://kostir.com/node/15</a>