As you may know, Midori is a lightweight web browser with full HTML5 and CSS3 support, used by default on the XFCE4 desktop environment and on Elementary OS systems.
The latest version available is Midori 0.5.11, which has been recently released, being only a bug-fix release.
The Midori developers maintain a Midori PPA which provides the latest packages for Ubuntu 15.04 Vivid Vervet, Ubuntu 14.04 Trusty Tahr and derivative systems like Linux Mint 17.2 Rafaela, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana, Pinguy OS 14.04, Elementary OS 0.3 Freya, Deepin 2014, Peppermint 6, Peppermint 5, LXLE 14.04, Linux Lite 2, so installing Midori should not cause to many problems.
You just need to add the PPA to your system, refresh the repository index and install the midori package:
$ sudo add-apt-repository ppa:midori/ppa
$ sudo apt-get update
$ sudo apt-get install midori
Optional, to remove midori, do:
$ sudo apt-get remove midori