# Upgrading from 2.1.0 to 2.1.1

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" folder.

注解

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

## Step 2: Replace config/mimes.php

This config file has been updated to contain more user mime-types, please copy it to _application/config/mimes.php*.

## Step 3: Update your IP address tables

This upgrade adds support for IPv6 IP addresses. In order to store them, you need to enlarge your ip_address columns to 45 characters. For example, CodeIgniter's session table will need to change

    ALTER TABLE ci_sessions CHANGE ip_address ip_address varchar(45) default '0' NOT NULL