diff --git a/Gemfile b/Gemfile
index 42acf7e..9332d47 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem "rake", "~> 12.3.3"
 # Include everything needed to run rake, tests, features, etc.
 group :development do
   gem "rspec", "~> 2.14.1"
-  gem "rdoc", "~> 4.1.1"
+  gem "rdoc", "~> 6.1.0"
   gem "bundler", "~> 1.0"
   gem "jeweler", "~> 2.0.1"
   gem "simplecov", "~> 0.8.1"