Cannot build the package because chef-gem will not build

[Builder: chef-gem] I | $ /opt/gitlab/embedded/bin/gem install chef --version '12.5.1' --bindir '/opt/gitlab/embedded/bin' --no-ri --no-rdoc
                                    D | Successfully installed mixlib-config-2.2.1
                                    D | Successfully installed mixlib-shellout-2.2.5
                                    D | Successfully installed chef-config-12.5.1
                                    D | Successfully installed mixlib-cli-1.5.0
                                    D | Successfully installed mixlib-log-1.6.0
                                    D | Successfully installed diff-lcs-1.2.5
                                    D | Successfully installed rspec-support-3.4.1
                                    D | Successfully installed rspec-mocks-3.4.0
                                    D | Successfully installed rspec-expectations-3.4.0
                                    D | Successfully installed rspec-core-3.4.1
                                    D | Successfully installed mixlib-authentication-1.4.0.rc.1
                                    D | Building native extensions.  This could take a while...
                                    D | Successfully installed ffi-1.9.10
                                    D | Successfully installed wmi-lite-1.0.0
                                    D | Successfully installed ipaddress-0.8.0
                                    D | Building native extensions.  This could take a while...
                                    D | Successfully installed libyajl2-1.2.0
                                    D | Building native extensions.  This could take a while...
                                    D | ERROR:  Error installing chef:
                                    D | 	rack requires Ruby version >= 2.2.2.
                                    D | Successfully installed ffi-yajl-2.2.2
                                    D | Successfully installed systemu-2.6.5
                                    D | Successfully installed ohai-8.8.1
                                    D | Successfully installed net-ssh-2.10.1.rc2
                                    D | Successfully installed net-ssh-gateway-1.2.0
                                    D | Successfully installed net-ssh-multi-1.2.1
                                    D | Successfully installed highline-1.7.8
                                    D | Successfully installed erubis-2.7.0