# CodeIgniter User Guide Version 1.7.3

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# Upgrading from 1.5.3 to 1.5.4

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 these files and directories in your "system" folder with the new versions:

- system/application/config/mimes.php
- system/codeigniter
- system/database
- system/helpers
- system/libraries
- system/plugins

Note: If you have any custom developed files in these folders please make copies of them first.

## Step 2: Add charset to your config.php

Add the following to system/application/config/config.php

`/*
|--------------------------------------------------------------------------
| Default Character Set
|--------------------------------------------------------------------------
|
| This determines which character set is used by default in various methods
| that require a character set to be provided.
|
*/
$config['charset'] = "UTF-8";`

## Step 3: Autoloading language files

If you want to autoload any language files, add this line to system/application/config/autoload.php

`$autoload['language'] = array();`

## Step 4: Update your user guide

Please also replace your local copy of the user guide with the new version.