diff --git a/Gemfile b/Gemfile
index e87d96b..e785c04 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,6 +2,10 @@ source 'https://rubygems.org'
 
 gemspec
 
+platforms :ruby_19 do
+  gem 'json', '~> 1.8'
+end
+
 group :benchmarking do
   gem 'ox', :platforms => [:mri, :rbx]
   gem 'nokogiri'