When I try to update eZP 1.6 to the lastest 1.6.2 version, composer asks me for a token and won't complete successful even if I have valid credentials for the Enterprise repositories:

• Updating ezsystems/studio-ui-bundle (v1.6.1 => v1.6.2)
  Checking out c30a255774d0dfb38836634b2efe997019e78fb4
  Cloning failed using an ssh key for authentication, enter your GitHub credentials to access private repos
  Head to https://github.com/settings/tokens/new?scopes=repo&description=Composer+on+ez-001+2016-12-22+1530
  to retrieve a token. It will be stored in "/home/user/.composer/auth.json" for future use by Composer.
  Token (hidden):

Steps to reproduce

1. Download the lastest eZ-Enterprise-v1.6.
2. Execute a composer update

   composer update --prefer-dist --no-dev