Update ImageMagick Ubuntu

I would like to update my version of ImageMagick. I originally installed ImageMagick with...

sudo apt-get imagemagick 

Current Version:

myapp$ convert -version
Version: ImageMagick 6.7.7-10 2014-03-06 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC
Features: OpenMP  

Location:

myapp$ which convert
/usr/bin/convert

System: Ubuntu14.04 / Apache2.47 / Passenger 4.0.5.5 / Rails 4.1.1 / Ruby 2.1.5

I do not have brew installed. What is the advised way to update?

ImageMagick 6.7.7-10 is the current version for Trusty. There is nothing to upgrade as this version was extensively tested with Trusty.

For available upgrades run

sudo apt-get update
sudo apt-get install --only-upgrade imagemagick

Only if you run in into a bug that you desperately need to fix yourself, should you compile a newer version:

mkdir -p ~/src
cd ~/src
wget http://www.imagemagick.org/download/ImageMagick-6.9.3-1.tar.gz
sudo apt-get install build-essential checkinstall
sudo apt-get build-dep imagemagick -y
tar xf ImageMagick-6.9.3-1.tar.gz
cd ~/src/ImageMagick-6.9.3-1
./configure
make
sudo checkinstall