killbill-paypal-express.gemspec in killbill-paypal-express-2.0.0 vs killbill-paypal-express.gemspec in killbill-paypal-express-3.0.0

@@ -20,10 +20,10 @@
   s.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
   s.require_paths = ['lib']
 
   s.rdoc_options << '--exclude' << '.'
 
-  s.add_dependency 'killbill', '~> 4.0.0'
+  s.add_dependency 'killbill', '~> 5.1.0'
 
   s.add_dependency 'sinatra', '~> 1.3.4'
   s.add_dependency 'thread_safe', '~> 0.3.4'
   s.add_dependency 'activerecord', '~> 4.1.0'
   if defined?(JRUBY_VERSION)