Update protobuf version
diff --git a/examples/cpp/helloworld/Makefile b/examples/cpp/helloworld/Makefile
index f2093af..d7c4b77 100644
--- a/examples/cpp/helloworld/Makefile
+++ b/examples/cpp/helloworld/Makefile
@@ -92,7 +92,7 @@
@echo "Please install Google protocol buffers 3.0.0 and its compiler."
@echo "You can find it here:"
@echo
- @echo " https://github.com/google/protobuf/releases/tag/v3.0.0-alpha-1"
+ @echo " https://github.com/google/protobuf/releases/tag/v3.0.0-beta-2"
@echo
@echo "Here is what I get when trying to evaluate your version of protoc:"
@echo