diff --git a/Gemfile.lock b/Gemfile.lock
index 657d93e..1ad7b7e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
     rake (13.0.3)
-    rdoc (5.1.0)
+    rdoc (6.3.2)
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -130,7 +130,7 @@ DEPENDENCIES
   openlab_ruby!
   rails (~> 5)
   rake
-  rdoc (~> 5)
+  rdoc (~> 6)
 
 BUNDLED WITH
    2.1.4
diff --git a/openlab_ruby.gemspec b/openlab_ruby.gemspec
index c1c8e68..54e023f 100644
--- a/openlab_ruby.gemspec
+++ b/openlab_ruby.gemspec
@@ -19,6 +19,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency "httparty", "~> 0.13"
   s.add_development_dependency "rails", "~> 5"
-  s.add_development_dependency "rdoc", "~> 5"
+  s.add_development_dependency "rdoc", "~> 6"
   s.add_development_dependency "rake"
 end