diff --git a/Gemfile b/Gemfile
index 1b6f1b60..7009a518 100644
--- a/Gemfile
+++ b/Gemfile
@@ -85,7 +85,6 @@ end
 gem 'bootstrap3-datetimepicker-rails', '~> 3.0.2'
 gem 'jquery-datatables-rails', '~> 2.2.1'
 # for charts
-gem 'd3_rails'
 gem 'chart-js-rails'
 
 # for user avatars
diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index 7cac4c52..98c9fbb1 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -18,7 +18,6 @@
 //= require cocoon
 //= require bootstrap
 //= require Chart
-//= require d3
 //= require osem
 //= require osem-dashboard
 //= require ahoy