diff --git a/Gemfile b/Gemfile
index 6a6486a6..076ed2aa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -40,7 +40,7 @@ gem 'tubesock'
 gem 'faye-websocket'
 gem 'eventmachine', '1.0.9.1' # explicitly added, this is used by faye-websocket, version 1.2.5 still has an error in eventmachine.rb:202: [BUG] Segmentation fault, which is not yet fixed and causes the whole ruby process to crash
 gem 'nokogiri'
-gem 'd3-rails'
+gem 'd3-rails', '~>4.0'
 gem 'rest-client'
 gem 'rubyzip'
 gem 'whenever', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 7edb56f0..456aeb24 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -388,7 +388,7 @@ DEPENDENCIES
   coffee-rails
   concurrent-ruby
   concurrent-ruby-ext
-  d3-rails
+  d3-rails (~> 4.0)
   database_cleaner
   docker-api
   eventmachine (= 1.0.9.1)