diff --git a/Gemfile b/Gemfile
index 2cf0787..547c402 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,6 +15,7 @@ group :development, :test do
   gem "shoulda"
   gem "test-unit"
   gem "ci_reporter"
+  gem "ruby-prof"
 
   # Java
   platforms :jruby do