diff --git a/Gemfile b/Gemfile
index 0a80e40..2c8c8e1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,7 +26,7 @@ gem 'turbolinks'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.7'
 # bundle exec rake doc:rails generates the API under doc/api.
-gem 'sdoc', '~> 0.4', group: :doc
+gem 'sdoc', '~> 1.0', group: :doc
 
 # Use ActiveModel has_secure_password
 # gem 'bcrypt', '~> 3.1.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index 79f5ae1..da2c768 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -120,7 +120,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.6)
+    json (2.1.0)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.6)
@@ -181,7 +181,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (12.0.0)
-    rdoc (4.3.0)
+    rdoc (6.0.1)
     responders (2.3.0)
       railties (>= 4.2.0, < 5.1)
     rspec-core (3.6.0)
@@ -209,9 +209,8 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    sdoc (0.4.2)
-      json (~> 1.7, >= 1.7.7)
-      rdoc (~> 4.0)
+    sdoc (1.0.0)
+      rdoc (>= 5.0)
     select2-rails (3.5.10)
       thor (~> 0.14)
     simplecov (0.15.0)
@@ -281,7 +280,7 @@ DEPENDENCIES
   rails_12factor
   rspec-rails (~> 3.6)
   sass-rails (~> 5.0)
-  sdoc (~> 0.4)
+  sdoc (~> 1.0)
   select2-rails (~> 3.5)
   simplecov
   spreadsheet