Gemfile in health-data-standards-3.2.7 vs Gemfile in health-data-standards-3.2.8

@@ -14,10 +14,10 @@
   gem "tailor", '~> 1.1.2'
   gem "cane", '~> 2.3.0'
   gem 'simplecov', :require => false
   gem 'webmock'
 
-  gem 'minitest'
+  gem "minitest", "~> 4.0"
   gem 'turn', :require => false
   gem 'awesome_print', :require => 'ap'
 
 end