Error on startup: syntax error, unexpected '.'

[isaacbentley]

OSX High Sierra 10.13.2

bundle clean --force

Removing kubert (0.2.2)

gem install kubert

Successfully installed kubert-0.2.2
Parsing documentation for kubert-0.2.2
Done installing documentation for kubert after 0 seconds
1 gem installed

bundle install

Using rake 10.5.0
Using concurrent-ruby 1.0.5
Using i18n 0.9.1
Using minitest 5.11.1
Using thread_safe 0.3.6
Using tzinfo 1.2.4
Using activesupport 4.2.10
Using public_suffix 3.0.1
Using addressable 2.5.2
Using bundler 1.16.1
Using coderay 1.1.2
Using deep_merge 1.2.1
Using deterministic_random_username 1.0.0
Using diff-lcs 1.3
Using unf_ext 0.0.7.4
Using unf 0.1.4
Using domain_name 0.5.20170404
Using http-cookie 1.0.3
Using http-form_data 1.0.3
Using http_parser.rb 0.6.0
Using http 0.9.8
Using recursive-open-struct 1.0.0
Using mime-types-data 3.2016.0521
Using mime-types 3.1
Using netrc 0.11.0
Using rest-client 2.0.2
Using kubeclient 2.5.1
Using thor 0.20.0
Using ky 0.6.2
Using kubert 0.2.2 from source at .
Using method_source 0.9.0
Using pry 0.11.3
Using rspec-support 3.7.0
Using rspec-core 3.7.1
Using rspec-expectations 3.7.0
Using rspec-mocks 3.7.0
Using rspec 3.7.0
Bundle complete! 5 Gemfile dependencies, 37 gems now installed.
Use bundle info [gemname] to see where a bundled gem is installed.

console

/Users/ibentley/src/kubert/lib/kubert.rb:7:in require_relative': /Users/ibentley/src/kubert/lib/kubert/environment.rb:25: syntax error, unexpected '.' (SyntaxError) ...fig] || options[:new_secret])&.to_sym ... ^ /Users/ibentley/src/kubert/lib/kubert/environment.rb:118: syntax error, unexpected '.' key&.downcase&.dasherize ^ from /Users/ibentley/src/kubert/lib/kubert.rb:7:in <top (required)>'
from /Users/ibentley/.rvm/gems/ruby-2.1.6/gems/kubert-0.2.2/bin/console:4:in require' from /Users/ibentley/.rvm/gems/ruby-2.1.6/gems/kubert-0.2.2/bin/console:4:in <top (required)>'
from /Users/ibentley/.rvm/gems/ruby-2.1.6/bin/console:23:in load' from /Users/ibentley/.rvm/gems/ruby-2.1.6/bin/console:23:in

'