############################# Upgrading from 3.1.8 to 3.1.9 #############################

Before performing an update you should take your site offline by replacing the index.php file with a static one.

Step 1: Update your CodeIgniter files

Replace all files and directories in your system/ directory.

.. note:: If you have any custom developed files in these directories, please make copies of them first.

Step 2: Replace config/mimes.php

This config file has received some updates. Please copy it to application/config/mimes.php.