diff --git a/Gemfile b/Gemfile
index 1edc6c2..0d823fb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem 'configatron'
 gem 'json'
 
 group :development do
-  gem 'rdoc', '~> 3.12'
+  gem 'rdoc', '~> 6.3'
   gem 'bundler', '~> 1.0.0'
   gem 'jeweler', '~> 1.8.4'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index d802953..5f043d4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,8 +11,7 @@ GEM
       rdoc
     json (1.7.3)
     rake (0.9.2.2)
-    rdoc (3.12)
-      json (~> 1.4)
+    rdoc (6.3.1)
     yamler (0.1.0)
 
 PLATFORMS
@@ -23,4 +22,4 @@ DEPENDENCIES
   configatron
   jeweler (~> 1.8.4)
   json
-  rdoc (~> 3.12)
+  rdoc (~> 6.3)
diff --git a/gcm_on_rails.gemspec b/gcm_on_rails.gemspec
index 5fc23ee..9c86716 100644
--- a/gcm_on_rails.gemspec
+++ b/gcm_on_rails.gemspec
@@ -49,20 +49,20 @@ Gem::Specification.new do |s|
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_runtime_dependency(%q<configatron>, [">= 0"])
       s.add_runtime_dependency(%q<json>, [">= 0"])
-      s.add_development_dependency(%q<rdoc>, ["~> 3.12"])
+      s.add_development_dependency(%q<rdoc>, "~> 6.3")
       s.add_development_dependency(%q<bundler>, ["~> 1.0.0"])
       s.add_development_dependency(%q<jeweler>, ["~> 1.8.4"])
     else
       s.add_dependency(%q<configatron>, [">= 0"])
       s.add_dependency(%q<json>, [">= 0"])
-      s.add_dependency(%q<rdoc>, ["~> 3.12"])
+      s.add_dependency(%q<rdoc>, "~> 6.3")
       s.add_dependency(%q<bundler>, ["~> 1.0.0"])
       s.add_dependency(%q<jeweler>, ["~> 1.8.4"])
     end
   else
     s.add_dependency(%q<configatron>, [">= 0"])
     s.add_dependency(%q<json>, [">= 0"])
-    s.add_dependency(%q<rdoc>, ["~> 3.12"])
+    s.add_dependency(%q<rdoc>, "~> 6.3")
     s.add_dependency(%q<bundler>, ["~> 1.0.0"])
     s.add_dependency(%q<jeweler>, ["~> 1.8.4"])
   end