If upgrading Composer from 1.7 to 1.9 will it affect the laravel 5.0 project

If upgrading Composer from 1.7 to 1.9 will it affect the laravel 5.0 project

on Cpanel there are larvavel 5.0 projects. if i upgrade composer from 1.7 to 1.9 to install the latest version of laravel project will the comopser affect the laravel projects on cpanel

via Chebli Mohamed