diff --git a/Gemfile b/Gemfile
index 0b98dc1f75..412cc627b9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -40,7 +40,7 @@ gem "rubocop", ">= 0.47", require: false
 gem "rb-inotify", github: "matthewd/rb-inotify", branch: "close-handling", require: false
 
 group :doc do
-  gem "sdoc", "> 1.0.0.rc1", "< 2.0"
+  gem "sdoc", github: "robin850/sdoc", branch: "upgrade"
   gem "redcarpet", "~> 3.2.3", platforms: :ruby
   gem "w3c_validators"
   gem "kindlerb", "~> 1.2.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 1fcc802b5b..516b4155c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,6 +41,14 @@ GIT
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
 
+GIT
+  remote: https://github.com/robin850/sdoc.git
+  revision: 0e340352f3ab2f196c8a8743f83c2ee286e4f71c
+  branch: upgrade
+  specs:
+    sdoc (1.0.0.rc2)
+      rdoc (~> 5.0)
+
 PATH
   remote: .
   specs:
@@ -389,8 +397,6 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sdoc (1.0.0.rc2)
-      rdoc (~> 5.0)
     selenium-webdriver (3.5.1)
       childprocess (~> 0.5)
       rubyzip (~> 1.0)
@@ -521,7 +527,7 @@ DEPENDENCIES
   resque-scheduler
   rubocop (>= 0.47)
   sass-rails!
-  sdoc (> 1.0.0.rc1, < 2.0)
+  sdoc!
   sequel
   sidekiq
   sneakers