title: How to install mpdf v8 with composer (currently it only installs v6)
body: <p>I am on ubuntu 12.04 and trying to install the latest release (v8) of mPDF using the following command:</p>
  
  <p>composer require mpdf/mpdf</p>
  
  <p>However, only v6 gets installed.
  Is there any easy way to install version 7 or 8 of mPDF - or is it quite a long process?</p>
  
  <hr>
  
  <p>UPDATE</p>
  
  <p>After running composer require mpdf/mpdf:^8.0
  it looks like the PHP version on the server is 5.3.0.
  Although none of the domains on the server use this (I use plesk to force all domains to use 7.1).</p>