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#############################
Upgrading from 2.1.4 to 2.2.x
#############################
.. note:: The :doc:`Encrypt Class </libraries/encrypt>` now requires the
Mcrypt extension. If you were previously using the Encrypt Class
without Mcrypt, then this is a breaking change. You must install
the Mcrypt extension in order to upgrade. For information on
installing Mcrypt please see the PHP `documentation
<http://php.net/manual/en/mcrypt.setup.php>`.
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.
.. note:: If you have any custom developed files in these folders please
make copies of them first.
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