Corrects error during run of grpc-demo
diff --git a/ruby/grpc-demo.gemspec b/ruby/grpc-demo.gemspec
index 0b3d78c..9d339dc 100644
--- a/ruby/grpc-demo.gemspec
+++ b/ruby/grpc-demo.gemspec
@@ -17,7 +17,7 @@
   s.require_paths = ['lib']
   s.platform      = Gem::Platform::RUBY
 
-  s.add_dependency 'grpc', '~> 0.5.0'
+  s.add_dependency 'grpc', '~> 0.6.0'
 
   s.add_development_dependency 'bundler', '~> 1.7'
 end