my project on laravel 5 but i can`t install dom pdf package

Problem 1 - Root composer.json requires barryvdh/laravel-dompdf 0.8.2 -> satisfiable by barryvdh/laravel-dompdf[v0.8.2]. - barryvdh/laravel-dompdf v0.8.2 requires dompdf/dompdf ^0.8 -> found dompdf/dompdf[v0.8.0, ..., v0.8.6] but it conflicts with your root composer.json require (^2.0).

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

via Chebli Mohamed