diff --git a/Gemfile b/Gemfile
index 1089fb1..4f0c499 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 group :development do
   gem 'rake'
   gem 'rspec'
-  gem 'rdoc', '~> 3.12'
+  gem 'rdoc', '~> 6.3'
   gem 'bundler', '~> 1.0'
   gem 'jeweler', '~> 2.0.1'
   gem 'rake-compiler'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9573a1f..e646245 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,13 +27,14 @@ GEM
       nokogiri (>= 1.5.10)
       rake
       rdoc
-    json (1.8.1)
     jwt (0.1.11)
       multi_json (>= 1.5)
     mini_portile (0.5.2)
     multi_json (1.8.4)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
+    nokogiri (1.6.1)
+      mini_portile (~> 0.5.0)
     nokogiri (1.6.1-x86-mingw32)
       mini_portile (~> 0.5.0)
     oauth2 (0.9.3)
@@ -46,8 +47,7 @@ GEM
     rake (10.1.1)
     rake-compiler (0.9.2)
       rake
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (6.3.1)
     rspec (2.14.1)
       rspec-core (~> 2.14.0)
       rspec-expectations (~> 2.14.0)
@@ -58,6 +58,7 @@ GEM
     rspec-mocks (2.14.5)
 
 PLATFORMS
+  ruby
   x86-mingw32
 
 DEPENDENCIES
@@ -65,5 +66,5 @@ DEPENDENCIES
   jeweler (~> 2.0.1)
   rake
   rake-compiler
-  rdoc (~> 3.12)
+  rdoc (~> 6.3)
   rspec
diff --git a/fast_trie.gemspec b/fast_trie.gemspec
index 0816621..876cd44 100644
--- a/fast_trie.gemspec
+++ b/fast_trie.gemspec
@@ -51,14 +51,14 @@ Gem::Specification.new do |s|
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_development_dependency(%q<rake>, [">= 0"])
       s.add_development_dependency(%q<rspec>, [">= 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"])
       s.add_development_dependency(%q<jeweler>, ["~> 2.0.1"])
       s.add_development_dependency(%q<rake-compiler>, [">= 0"])
     else
       s.add_dependency(%q<rake>, [">= 0"])
       s.add_dependency(%q<rspec>, [">= 0"])
-      s.add_dependency(%q<rdoc>, ["~> 3.12"])
+      s.add_dependency(%q<rdoc>, "~> 6.3")
       s.add_dependency(%q<bundler>, ["~> 1.0"])
       s.add_dependency(%q<jeweler>, ["~> 2.0.1"])
       s.add_dependency(%q<rake-compiler>, [">= 0"])
@@ -66,7 +66,7 @@ Gem::Specification.new do |s|
   else
     s.add_dependency(%q<rake>, [">= 0"])
     s.add_dependency(%q<rspec>, [">= 0"])
-    s.add_dependency(%q<rdoc>, ["~> 3.12"])
+    s.add_dependency(%q<rdoc>, "~> 6.3")
     s.add_dependency(%q<bundler>, ["~> 1.0"])
     s.add_dependency(%q<jeweler>, ["~> 2.0.1"])
     s.add_dependency(%q<rake-compiler>, [">= 0"])