diff --git a/Gemfile b/Gemfile
index 688df07..35857c1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem "i18n"
 
 group :development do
   gem "rspec", "~> 2.8.0"
-  gem "rdoc", "~> 3.12"
+  gem "rdoc", "~> 6.3"
   gem "bundler", "~> 1.2.0"
   gem "jeweler", "~> 1.8.4"
   gem "guard-rspec"
diff --git a/Gemfile.lock b/Gemfile.lock
index 8c3d541..62a1945 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
       git (>= 1.2.5)
       rake
       rdoc
-    json (1.7.5)
+    json (2.6.2)
     listen (0.4.7)
       rb-fchange (~> 0.0.5)
       rb-fsevent (~> 0.9.1)
@@ -34,8 +34,7 @@ GEM
     rb-fsevent (0.9.1)
     rb-inotify (0.8.8)
       ffi (>= 0.5.0)
-    rdoc (3.12)
-      json (~> 1.4)
+    rdoc (6.3.1)
     rest-client (1.6.7)
       mime-types (>= 1.16)
     rspec (2.8.0)
@@ -58,5 +57,5 @@ DEPENDENCIES
   i18n
   jeweler (~> 1.8.4)
   localeapp
-  rdoc (~> 3.12)
+  rdoc (~> 6.3)
   rspec (~> 2.8.0)
diff --git a/iso.gemspec b/iso.gemspec
index 387e727..dfadc90 100644
--- a/iso.gemspec
+++ b/iso.gemspec
@@ -55,7 +55,7 @@ Gem::Specification.new do |s|
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_runtime_dependency(%q<i18n>, [">= 0"])
       s.add_development_dependency(%q<rspec>, ["~> 2.8.0"])
-      s.add_development_dependency(%q<rdoc>, ["~> 3.12"])
+      s.add_development_dependency(%q<rdoc>, "~> 6.3")
       s.add_development_dependency(%q<bundler>, ["~> 1.2.0"])
       s.add_development_dependency(%q<jeweler>, ["~> 1.8.4"])
       s.add_development_dependency(%q<guard-rspec>, [">= 0"])
@@ -63,7 +63,7 @@ Gem::Specification.new do |s|
     else
       s.add_dependency(%q<i18n>, [">= 0"])
       s.add_dependency(%q<rspec>, ["~> 2.8.0"])
-      s.add_dependency(%q<rdoc>, ["~> 3.12"])
+      s.add_dependency(%q<rdoc>, "~> 6.3")
       s.add_dependency(%q<bundler>, ["~> 1.2.0"])
       s.add_dependency(%q<jeweler>, ["~> 1.8.4"])
       s.add_dependency(%q<guard-rspec>, [">= 0"])
@@ -72,7 +72,7 @@ Gem::Specification.new do |s|
   else
     s.add_dependency(%q<i18n>, [">= 0"])
     s.add_dependency(%q<rspec>, ["~> 2.8.0"])
-    s.add_dependency(%q<rdoc>, ["~> 3.12"])
+    s.add_dependency(%q<rdoc>, "~> 6.3")
     s.add_dependency(%q<bundler>, ["~> 1.2.0"])
     s.add_dependency(%q<jeweler>, ["~> 1.8.4"])
     s.add_dependency(%q<guard-rspec>, [">= 0"])