diff --git a/Gemfile b/Gemfile
index 4ae35f6..1310c85 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem 'turbolinks', '~> 5.2.1'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.11.2'
 # bundle exec rake doc:rails generates the API under doc/api.
-gem 'sdoc', '~> 2.0.3',          group: :doc
+gem 'sdoc', '~> 2.0.4',          group: :doc
 
 gem 'web-console', '~> 4.1.0', group: :development
 gem 'listen', '~> 3.4.1', group: :development
diff --git a/Gemfile.lock b/Gemfile.lock
index a0af990..fe3ad05 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -201,7 +201,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rdoc (6.2.1)
+    rdoc (6.3.0)
     responders (3.0.1)
       actionpack (>= 5.0)
       railties (>= 5.0)
@@ -214,7 +214,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    sdoc (2.0.3)
+    sdoc (2.0.4)
       rdoc (>= 5.0)
     simplecov (0.18.1)
       docile (~> 1.1)
@@ -279,7 +279,7 @@ DEPENDENCIES
   rails-controller-testing
   rails-i18n (~> 6.0.0)
   sassc-rails (~> 2.1.2)
-  sdoc (~> 2.0.3)
+  sdoc (~> 2.0.4)
   sqlite3 (~> 1.4.1)
   turbolinks (~> 5.2.1)
   tzinfo-data