Gemfile in mutils-1.1.3 vs Gemfile in mutils-1.1.4

@@ -2,9 +2,10 @@
 
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in mutils.gemspec
 gem 'coveralls', '>= 0.8.23'
+gem 'json', '>= 2.3.1'
 gem 'pre-commit', require: false
 gem 'rspec'
 gem 'rspec-benchmark'
 gem 'rspec-json_expectations'
 gem 'rubocop'