diff --git a/Gemfile b/Gemfile
index 2a0f2ff..0b3e740 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,5 +16,5 @@ gem 'turbolinks', '1.1.1'
 gem 'jbuilder', '1.0.2'
 
 group :doc do
-  gem 'sdoc', '0.3.20', require: false
+  gem 'sdoc', '1.0.0', require: false
 end
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