Conflitcts with root composer.json

[paulosanda]

When I run
composer update --ignore-plataform-reqs
I receve this error msg

Problem 1
- darkaonline/l5-swagger[5.7.1, ..., 5.7.x-dev] require laravel/framework 5.6.|5.7. -> found laravel/framework[v5.6.0, ..., 5.7.x-dev] but it conflicts with your root composer.json require (^5.8.0).
- darkaonline/l5-swagger 5.7.0 requires laravel/framework 5.6.* -> found laravel/framework[v5.6.0, ..., 5.6.x-dev] but it conflicts with your root composer.json require (^5.8.0).
- Root composer.json requires darkaonline/l5-swagger 5.7.* -> satisfiable by darkaonline/l5-swagger[5.7.0, ..., 5.7.x-dev].