Install specify version for protoc-gen-go

install-protoc-gen-go.md

GIT_TAG='v1.1.0'
go get -d -u github.com/golang/protobuf/protoc-gen-go
git -C "$(go env GOPATH)"/src/github.com/golang/protobuf checkout $GIT_TAG
go install github.com/golang/protobuf/protoc-gen-go

Check current protoc-gen-go location

which protoc-gen-go

If this file localted in /usr/local/bin/ not in $GOPATH/bin.

Let's remove or uninstall current version of protoc-gen-go by:

brew uninstall protoc-gen-go 
// or just 
sudo rm /usr/local/bin/protoc-gen-go

Then restart terminal

This was very helpful. thank you.