diff --git a/Gemfile b/Gemfile
index 03ff6c0..8cbd8c4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -41,7 +41,7 @@ gem 'turbolinks'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.9'
 # bundle exec rake doc:rails generates the API under doc/api.
-gem 'sdoc', '~> 2.2.0', group: :doc
+gem 'sdoc', '~> 2.3.1', group: :doc
 
 # Use ActiveModel has_secure_password
 # gem 'bcrypt', '~> 3.1.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index b089476..f41bd61 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -340,7 +340,7 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rdoc (6.3.2)
+    rdoc (6.3.3)
     readingtime (0.4.0)
     redis (4.4.0)
     refinerycms (3.0.6)
@@ -437,8 +437,8 @@ GEM
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
-    sdoc (2.2.0)
-      rdoc (>= 5.0)
+    sdoc (2.3.1)
+      rdoc (>= 5.0, < 6.4.0)
     seo_meta (2.0.1)
       railties (>= 3.0.0)
     sextant (0.2.4)
@@ -538,7 +538,7 @@ DEPENDENCIES
   refinerycms-teams!
   refinerycms-wymeditor (~> 1.0, >= 1.0.6)
   sass-rails (~> 5.0)
-  sdoc (~> 2.2.0)
+  sdoc (~> 2.3.1)
   sextant
   sidekiq
   turbolinks