Error when upgrade drupal 8.4.5

[phannguyen]

Hi @beltofte,
When I run command: composer update, I get error:

Problem 1 - Can only install one of: symfony/css-selector[3.2.x-dev, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.10, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.11, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.12, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.13, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.14, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.8, 2.8.x-dev]. - Can only install one of: symfony/css-selector[v3.2.9, 2.8.x-dev]. - ffwagency/borgerdk-php dev-master requires symfony/css-selector ~2.8 -> satisfiable by symfony/css-selector[2.8.x-dev]. - Installation request for ffwagency/borgerdk-php dev-master -> satisfiable by ffwagency/borgerdk-php[dev-master]. - Installation request for symfony/css-selector ~3.2.8 -> satisfiable by symfony/css-selector[3.2.x-dev, v3.2.10, v3.2.11, v3.2.12, v3.2.13, v3.2.14, v3.2.8, v3.2.9].
Can you fix composer.jon file? Thanks.