Qt 5.5.0 to 5.5.1 upgrade

Hi All

I installed Qt 5.5.0 a few months ago. I am working on Ubuntu 14.04 and downloaded Qt5.5.0 from https://launchpad.net/~beineri
I am now trying to upgrade to Qt5.5.1.

I use the commands ...

sudo apt-add-repository ppa:beineri/opt-qt551-trusty
sudo apt-get update
sudo apt-get install qt-latest

This all worked perfectly when i originally installed qt 5.5.0 but now i'm trying to install Qt5.5.1 its not updating. The commands seem to run OK - no errors, but the install qt-latest command finished very quickly and now tells me that qt-latest is already the newest version. However, my Qt install is still Qt 5.5.0

I think it may be because its trying to install Qt5.5.1 in opt/qt55 which is the same folder as where Qt5.5.0 is installed ??

I'm a linux novice and lost as where to go from here.
Any help would be greatly appreciated.

Mike