Gemfile in groupie-0.4.1 vs Gemfile in groupie-0.5.0

@@ -3,9 +3,10 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in groupie.gemspec
 gemspec
 
+gem 'psych', '~> 4.0'
 gem 'rake', '~> 13.0'
 gem 'rspec', '~> 3.0'
 gem 'rubocop', '~> 1.7'
 gem 'rubocop-performance', '~> 1.11'
 gem 'rubocop-rake', '~> 0.6.0'