diff --git a/Gemfile b/Gemfile
index 3b26cb1..9dbcf70 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rake'
 gem 'rspec'
 gem 'webmock'
 gem 'safe_yaml', '>= 1.0.4'
-gem 'rdoc', '5.1.0'
+gem 'rdoc', '6.3.2'
 
 gem 'activesupport', '>= 3.1.0'
 gem 'nokogiri', '~> 1.10.8'
diff --git a/Gemfile.lock b/Gemfile.lock
index 29588be..3bc8ad3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,7 +34,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.3)
     rake (13.0.1)
-    rdoc (5.1.0)
+    rdoc (6.3.2)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -66,7 +66,7 @@ DEPENDENCIES
   json (>= 2.3.0)
   nokogiri (~> 1.10.8)
   rake
-  rdoc (= 5.1.0)
+  rdoc (= 6.3.2)
   rspec
   safe_yaml (>= 1.0.4)
   webmock