# Upgrading from 3.1.9 to 3.1.10

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: Check for calls to is_countable()

PHP 7.3 introduces a native is_countable() function, which creates a name collision with the `is_countable()` function we’ve had in our Inflector Helpers.

If you’ve been using the helper function in question, you should now rename the calls to it to `word_is_countable()`.