rollbar.gemspec in rollbar-2.3.0 vs rollbar.gemspec in rollbar-2.4.0

@@ -1,9 +1,12 @@
 # -*- encoding: utf-8 -*-
 require File.expand_path('../lib/rollbar/version', __FILE__)
 
+
 Gem::Specification.new do |gem|
+  is_jruby = defined?(JRUBY_VERSION) || (defined?(RUBY_ENGINE) && 'jruby' == RUBY_ENGINE)
+
   gem.authors       = ["Rollbar, Inc."]
   gem.email         = ["[e-mail]"]
   gem.description   = %q{Easy and powerful exception tracking for Ruby}
   gem.executables   = ['rollbar-rails-runner']
   gem.summary       = %q{Reports exceptions to Rollbar}
@@ -26,7 +29,8 @@
   gem.add_development_dependency 'sinatra'
   gem.add_development_dependency 'resque'
   gem.add_development_dependency 'delayed_job'
   gem.add_development_dependency 'rake', '>= 0.9.0'
   gem.add_development_dependency 'redis'
-  gem.add_runtime_dependency     'oj', '~> 2.12.14'
+  gem.add_runtime_dependency     'multi_json'
+  gem.add_development_dependency 'oj', '~> 2.12.14' unless is_jruby
 end