diff --git a/Gemfile b/Gemfile
index 9a39411..fcf42f9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,5 +7,5 @@
 end
 
 group :doc do
-  gem 'rdoc', '~> 4.2.0'
+ gem 'rdoc', '~> 4.0.0'
 end
\ No newline at end of file