diff --git a/Gemfile.lock b/Gemfile.lock
index 557d23b..8fd669c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,6 @@ GEM
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
     jaro_winkler (1.5.4)
-    json (1.8.6)
     method_source (0.9.2)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
@@ -28,8 +27,7 @@ GEM
       method_source (~> 0.9.0)
     rainbow (3.0.0)
     rake (12.3.3)
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (6.3.1)
     rexml (3.2.5)
     rubocop (0.82.0)
       jaro_winkler (~> 1.5.1)
@@ -50,7 +48,7 @@ DEPENDENCIES
   minitest (~> 5.14.0)
   pry (~> 0.12.2)
   rake (~> 12.0)
-  rdoc (~> 3.12.2)
+  rdoc (~> 6.3.1)
   rubocop
 
 BUNDLED WITH
diff --git a/b2.gemspec b/b2.gemspec
index 780bcc0..6ea42b3 100644
--- a/b2.gemspec
+++ b/b2.gemspec
@@ -26,6 +26,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'httparty', '~> 0.18.0'
   s.add_development_dependency 'minitest', '~> 5.14.0'
   s.add_development_dependency 'pry', '~> 0.12.2'
-  s.add_development_dependency 'rdoc', '~> 3.12.2'
+  s.add_development_dependency 'rdoc', '~> 6.3.1'
   s.add_development_dependency 'rubocop'
 end