diff --git a/Gemfile b/Gemfile
index b81cda8..b46ccd3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,19 +1,23 @@
 source 'https://rubygems.org'
 puppetversion = ENV.key?('PUPPET_VERSION') ? "= #{ENV['PUPPET_VERSION']}" : ['>= 2.7']
 
 gem 'puppet', puppetversion
 
 group :development, :test do
   gem 'puppet-blacksmith'
   gem 'puppet-lint'
   gem 'puppetlabs_spec_helper'
   gem 'rake',                    '>=0.9.2.2'
   gem 'rspec-puppet'
 end
 
 group :system_tests do
   gem 'beaker-rspec',  :require => false
   gem 'serverspec',    :require => false
 end
 
+# json_pure 2.0.2 added a requirement on ruby >= 2. We pin to json_pure 2.0.1
+# if using ruby 1.x
+gem 'json_pure', '<= 2.0.1', :require => false if RUBY_VERSION =~ /^1\./
+
 gem 'hiera-puppet', :require => false