Update protobuf version
diff --git a/examples/cpp/route_guide/Makefile b/examples/cpp/route_guide/Makefile
index b906177..dd72e3d 100644
--- a/examples/cpp/route_guide/Makefile
+++ b/examples/cpp/route_guide/Makefile
@@ -86,7 +86,7 @@
@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