diff --git a/Gemfile.lock b/Gemfile.lock
index 8a95ca7..2693d56 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,11 +22,9 @@ GEM
     diff-lcs (1.2.4)
     hashie (2.0.5)
     i18n (0.6.5)
-    json (1.8.0)
     multi_json (1.8.0)
     rake (10.0.4)
-    rdoc (4.0.1)
-      json (~> 1.4)
+    rdoc (6.3.2)
     rspec (2.14.1)
       rspec-core (~> 2.14.0)
       rspec-expectations (~> 2.14.0)
@@ -41,6 +39,6 @@ PLATFORMS
 
 DEPENDENCIES
   rake
-  rdoc (~> 4.0)
+  rdoc (~> 6.3)
   rspec (~> 2.14.1)
   taskmapper!
diff --git a/taskmapper.gemspec b/taskmapper.gemspec
index 1563a65..e81fe47 100644
--- a/taskmapper.gemspec
+++ b/taskmapper.gemspec
@@ -22,6 +22,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency "activesupport", "~> 3.2"
   spec.add_dependency "hashie", "~> 2.0"
   spec.add_development_dependency "rake"
-  spec.add_development_dependency "rdoc", "~> 4.0"
+  spec.add_development_dependency "rdoc", "~> 6.3"
   spec.add_development_dependency "rspec", "~> 2.14.1"
 end