diff --git a/Rakefile b/Rakefile
index a71fdfe..83089eb 100644
--- a/Rakefile
+++ b/Rakefile
@@ -15,7 +15,6 @@ end
 
 require 'rdoc/task'
 require 'aasm/version'
-require 'sdoc'
 
 Rake::RDocTask.new do |rdoc|
   rdoc.rdoc_dir = 'rdoc'