diff --git a/Gemfile b/Gemfile
index 8f1132de9..cdf3c0e10 100644
--- a/Gemfile
+++ b/Gemfile
@@ -63,7 +63,7 @@ end
 group :test do
     gem 'test-unit-full', '~> 0.0.5'
     gem 'rspec', '~> 3.13'
-    gem 'rdoc', '~> 6.14'
+    gem 'rdoc', '~> 6.15'
     gem 'browserstack-local', '~> 1.4'
 
     gem 'irb', '~> 1.15'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1c1a3f475..8fad79c62 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -62,7 +62,7 @@ GEM
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
-    erb (5.0.2)
+    erb (5.0.3)
     erubis (2.7.0)
     espeak-ruby (1.1.0)
     event_emitter (0.2.6)
@@ -166,9 +166,10 @@ GEM
       rack (>= 1.3)
     rainbow (3.1.1)
     rake (13.3.0)
-    rdoc (6.14.2)
+    rdoc (6.15.0)
       erb
       psych (>= 4.0.0)
+      tsort
     regexp_parser (2.11.3)
     reline (0.6.2)
       io-console (~> 0.5)
@@ -268,6 +269,7 @@ GEM
     tins (1.43.0)
       bigdecimal
       sync
+    tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     uglifier (4.2.1)
@@ -322,7 +324,7 @@ DEPENDENCIES
   rack (~> 3.2)
   rack-protection (~> 4.1.1)
   rake (~> 13.3)
-  rdoc (~> 6.14)
+  rdoc (~> 6.15)
   rest-client (~> 2.1.0)
   rspec (~> 3.13)
   rubocop (~> 1.81.1)