Laravel PHP Version Error

I am in a trouble with Laravel 5.1 version. I have built it on Ubuntu Platform with PHP 5.5.9. Then I got the following error:

 PHP Parse error:  syntax error, unexpected 'class' (T_CLASS), expecting ')'

I searched for the solution, then I was informed about the PHP version of Ubuntu. Afterwards, I updated PHP version from 5.5.9 to 5.6.17. But still I am getting the same error. What is wrong in here?

via Chebli Mohamed