Gemfile in mailgun-ruby-1.1.10 vs Gemfile in mailgun-ruby-1.1.11

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in mailgun.gemspec
 gemspec
 
-gem 'json', '~> 1.8', platform: :mri_19
+gem 'json', '~> 2.1', platform: :mri_19