diff --git a/Gemfile b/Gemfile
index 21fe2f4..d72bc6b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,5 +5,7 @@ gem 'qtbindings'
 gem 'htmlentities'
 gem 'rest-client'
 
-# only needed for testing
-gem 'mocha'
+group :test do
+  # only needed for testing
+  gem 'mocha'
+end