diff --git a/Gemfile b/Gemfile
index fe8ec52..9b87ba8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ gem 'coveralls', :require => false
 # Include everything needed to run rake, tests, features, etc.
 group :development do
   gem "shoulda", ">= 0"
-  gem "rdoc", "~> 3.12"
+  gem "rdoc", "~> 6.3"
   gem "bundler", ">= 1.0.0"
   gem "jeweler", ">= 1.8.4"
   gem "simplecov", ">= 0"
diff --git a/Gemfile.lock b/Gemfile.lock
index c342761..ca98e71 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,8 +34,7 @@ GEM
     multi_json (1.6.1)
     multi_xml (0.5.3)
     rake (10.0.3)
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (6.3.1)
     rest-client (1.6.7)
       mime-types (>= 1.16)
     safe_yaml (0.9.3)
@@ -65,7 +64,7 @@ DEPENDENCIES
   jeweler (>= 1.8.4)
   json (>= 1.7.7)
   multi_xml (>= 0.5.2)
-  rdoc (~> 3.12)
+  rdoc (~> 6.3)
   shoulda
   simplecov
   webmock
diff --git a/pipedrive-ruby.gemspec b/pipedrive-ruby.gemspec
index 3e36011..26fd1d9 100644
--- a/pipedrive-ruby.gemspec
+++ b/pipedrive-ruby.gemspec
@@ -77,7 +77,7 @@ Gem::Specification.new do |s|
       s.add_runtime_dependency(%q<webmock>, [">= 0"])
       s.add_runtime_dependency(%q<coveralls>, [">= 0"])
       s.add_development_dependency(%q<shoulda>, [">= 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"])
       s.add_development_dependency(%q<simplecov>, [">= 0"])
@@ -88,7 +88,7 @@ Gem::Specification.new do |s|
       s.add_dependency(%q<webmock>, [">= 0"])
       s.add_dependency(%q<coveralls>, [">= 0"])
       s.add_dependency(%q<shoulda>, [">= 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"])
       s.add_dependency(%q<simplecov>, [">= 0"])
@@ -100,7 +100,7 @@ Gem::Specification.new do |s|
     s.add_dependency(%q<webmock>, [">= 0"])
     s.add_dependency(%q<coveralls>, [">= 0"])
     s.add_dependency(%q<shoulda>, [">= 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"])
     s.add_dependency(%q<simplecov>, [">= 0"])