diff --git a/README.md b/README.md
index f7498c5..f77ed8f 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,7 @@ end
 ## Dependencies
 
 * httparty
+* ox
 
 ## Contributing
 
diff --git a/commission_junction.gemspec b/commission_junction.gemspec
index fbffb79..18036b9 100644
--- a/commission_junction.gemspec
+++ b/commission_junction.gemspec
@@ -17,5 +17,6 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ['lib']
   gem.add_dependency 'httparty', '~> 0.12'
-  gem.add_dependency 'minitest'
+  gem.add_development_dependency 'minitest'
+  gem.add_dependency 'ox', '~> 2.1'
 end
diff --git a/lib/commission_junction.rb b/lib/commission_junction.rb
index a68de83..e9fbd7a 100644
--- a/lib/commission_junction.rb
+++ b/lib/commission_junction.rb
@@ -1,4 +1,5 @@
 require 'commission_junction/version'
+require 'ox'
 require 'httparty'
 
 # Silence peer certificate warnings from Net::HTTP.