Bug#1100569: puppetserver: Depends: ruby-concurrent (< 1.3.4.) but 1.3.5-1 is to be installed

[Adrian Bunk]

Package: puppetserver
Version: 8.7.0-3
Severity: serious

The following packages have unmet dependencies:
 puppetserver : Depends: ruby-concurrent (< 1.3.4.) but 1.3.5-1 is to be 
installed