wtf? it was never required?

Gemfile

@@ -7,14 +7,9 @@ gem 'yajl-ruby', '>=1.3.0' # Better JSON parser regarding memory usage
 gem 'terminal-table', '>=1.6.0'
 gem 'ruby-progressbar', '>=1.8.1'
 
-# needed from ruby 2.4 onwards
-install_if -> { Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("2.4") } do
-  gem 'xmlrpc', :require => false
-end
-
 group :test do
-  gem 'webmock'
-  gem 'simplecov'
-  gem 'rspec'
-  gem 'rspec-its'
+  gem 'webmock', '>=2.3.2'
+  gem 'simplecov', '>=0.13.0'
+  gem 'rspec', '>=3.5.0'
+  gem 'rspec-its', '>=1.2.0'
 end

lib/environment.rb

@@ -21,7 +21,6 @@ begin
   require 'uri'
   require 'time'
   require 'resolv'
-  require 'xmlrpc/client'
   require 'digest/md5'
   require 'digest/sha1'
   require 'base64'