Gemfile in instana-1.211.0 vs Gemfile in instana-1.212.0

@@ -2,10 +2,10 @@
 # (c) Copyright Instana Inc. 2016
 
 source 'https://rubygems.org'
 
 gem 'rake'
-gem 'minitest', '5.9.1'
+gem 'minitest', '5.20.0'
 gem 'minitest-reporters'
 gem 'webmock'
 gem 'puma'
 
 gem 'rubocop', '~> 1.9'