laravel5 user role and permission

i had laravel4.2 project and now i want to migrate it to laravel5 but,with "cartalyst/sentry": "2.1.*" role and permission not working please give me suggestion what i should do for it.

my exiting project composer 
"require": {
        "laravel/framework": "4.2.*",
        "cartalyst/sentry": "2.1.*",
        "intervention/image": "2.0.5",
        "barryvdh/laravel-ide-helper": "~1.11",
        "barryvdh/laravel-debugbar": "~1.8",
        "dinesh/easyform": "dev-master",
        "google/recaptcha": "~1.1"      
},

via Chebli Mohamed