MAMP upgrade PHP ICU version in Symfony checker
<p>I've just downloaded Symfony and I'm having a issue during the checking before starting a project.</p>

<p>After activating a php accelerator and disabling some extensions in php.ini, the system is displaying this message: intl ICU version installed on your system is outdated (56.1) and does not match the ICU data bundled with Symfony (57.1)</p>

<p>I've been searching through the documentation and I was not able to find how to fix that issue. 
Do I miss anything during the installation? How I upgrade this icu system?</p>

<p>Information about system:
OSX with MAMP
Running php 7
Symfony 3.1.14.</p>

<p>Thanks!</p>