How to run "composer update" on test/production server?

I'm developing an application in laravel, I have completed it on localhost, but when I run it on test server it shows me error

Class 'Collective\Html\HtmlServiceProvider' not found

I think it need to update composer. But how do I do it on test server..!

Please help me I'm new to laravel and web hosting. Thank you.

via Chebli Mohamed