diff --git a/web/Gemfile b/web/Gemfile
index 0f5f3066e..91f446324 100644
--- a/web/Gemfile
+++ b/web/Gemfile
@@ -32,7 +32,7 @@ gem 'ruby-protocol-buffers', '1.2.2'
 gem 'pg', '0.15.1'
 gem 'compass-rails'
 gem 'rabl' # for JSON API development
-gem 'gon' # for passthrough of Ruby variables to Javascript variables
+gem 'gon', '~>4.1.0' # for passthrough of Ruby variables to Javascript variables
 gem 'eventmachine', '1.0.3'
 gem 'amqp', '0.9.8'
 gem 'logging-rails', :require => 'logging/rails'