diff --git a/Gemfile b/Gemfile
index fc888f2..46df6f9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -30,7 +30,6 @@ gem 'foundation-rails', '~> 5.5'
 gem 'leaflet-rails'
 gem 'validate_url'
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]
-gem 'sdoc', '~> 0.4.0', group: :doc
 
 group :development do
   gem 'spring'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2b3780f..a715711 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,7 +106,6 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.6)
     kaminari (1.2.0)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.2.0)
@@ -196,7 +195,6 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rainbow (3.0.0)
     rake (13.0.1)
-    rdoc (4.3.0)
     regexp_parser (1.7.0)
     rest-client (1.6.7)
       mime-types (>= 1.16)
@@ -240,9 +238,6 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    sdoc (0.4.2)
-      json (~> 1.7, >= 1.7.7)
-      rdoc (~> 4.0)
     shoulda-matchers (3.1.3)
       activesupport (>= 4.0.0)
     simplecov (0.18.5)
@@ -324,7 +319,6 @@ DEPENDENCIES
   rubocop
   rubocop-faker
   sass-rails
-  sdoc (~> 0.4.0)
   shoulda-matchers (~> 3.1)
   simplecov
   slim-rails