Error install Sentry in Laravel 5.3 following the official guide

I have an error installing sentry in laravel 5.3 following the official guide. Someone knows why this error. Thank you very much and excuse my English. Command composer require sentry/sentry-laravel:1.0.0-beta3 php-http/curl-client guzzlehttp/psr7 Error Problem 1 - Installation request for sentry/sentry-laravel 1.0.0-beta3 -> satisfiable by sentry/sentry-laravel[1.0.0-beta3]. - sentry/sentry-laravel 1.0.0-beta3 requires sentry/sentry 2.0.0-beta1 -> satisfiable by sentry/sentry[2.0.0-beta1] but these conflict with your requirements or minimum-stability.

via Chebli Mohamed