diff --git a/Gemfile b/Gemfile
index aa8e2a9d..250fe060 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,7 +27,7 @@ gem 'haml', '>= 3.0', :group => 'haml'
 gem 'sass', :group => 'sass'
 gem 'builder', :group => 'builder'
 gem 'erubis', :group => 'erubis'
-gem 'less', :group => 'less'
+gem 'less', '~> 1.0', :group => 'less'
 gem 'liquid', :group => 'liquid'
 gem 'slim', :group => 'slim'
 gem 'RedCloth', :group => 'redcloth' if RUBY_VERSION < "1.9.3" and not RUBY_ENGINE.start_with? 'ma'