diff --git a/Gemfile b/Gemfile
index 2d893e39..6b4591a4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,5 +3,6 @@ source "http://rubygems.org"
 gemspec
 
 gem "rake"
+gem "rdoc"
 gem "mocha"
 gem "ruby-debug", :platform => :mri_18
diff --git a/Rakefile b/Rakefile
index e11ac28f..3e79e2f1 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,7 +4,7 @@ require 'bundler'
 Bundler::GemHelper.install_tasks
 
 require 'rake/testtask'
-require 'rake/rdoctask'
+require 'rdoc/task'
 
 desc 'Default: run unit tests.'
 task :default => :test