diff --git a/Gemfile b/Gemfile
index 19799f4..28fc29b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ group :development do
   gem 'byebug'
   gem 'jeweler', '~> 2.0.1'
   gem 'minitest', '>= 0'
-  gem 'rdoc', '~> 3.12'
+  gem 'rdoc', '~> 6.2'
   gem 'simplecov', '>= 0'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4fe9656..0c21244 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,8 +111,7 @@ GEM
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
     rake (12.3.1)
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (6.2.1)
     simplecov (0.16.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
@@ -197,7 +196,7 @@ DEPENDENCIES
   homecoming (~> 0.1.1)
   jeweler (~> 2.0.1)
   minitest
-  rdoc (~> 3.12)
+  rdoc (~> 6.2)
   simplecov
   spyke (~> 5.0.0)
   tty (~> 0.7.0)