Gemfile in rouge-4.0.1 vs Gemfile in rouge-4.1.0

@@ -6,10 +6,10 @@
 
 gem 'rake'
 
 gem 'minitest', '>= 5.0'
 gem 'minitest-power_assert'
-gem 'power_assert', '~> 1.2'
+gem 'power_assert', '~> 2.0'
 
 gem 'rubocop', '~> 1.0', '<= 1.11'
 gem 'rubocop-performance'
 
 # don't try to install redcarpet under jruby