diff --git a/Gemfile b/Gemfile
index eadf8e2c..327af9ce 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 # Specify your gem's dependencies in twitter-bootstrap-rails.gemspec
 gemspec
-gem 'less-rails', :path => ENV['LESS_RAILS_SOURCE'] if ENV['LESS_RAILS_SOURCE']
+gem 'less-rails', '~> 4.0.0'
 gem 'activesupport', '< 5.0.1' if RUBY_VERSION < '2.1.3'
 
 group :development, :test do