GoLang Dependency Not found - google.golang.org/grpc/cmd/protoc-gen-go-grpc

Problem description

I have a dependency which I need to update to the latest version (1.1.0 to 1.2.0), but when I do and I run go mod tidy - although initially the 1.2.0 version has been downloaded, it is immediately removed since it's not used directly from the module.

I am trying to identify why I am I using google.golang.org/grpc/cmd/protoc-gen-go-grpc in my code.

I've tried the following:

• go mod graph | grep protoc-gen-go -> no results

• It also seems that the module is related to an indirect dependency since the following command shows me that the main module does not directly use this module.

  go mod why -m google.golang.org/grpc/cmd/protoc-gen-go-grpc
  # google.golang.org/grpc/cmd/protoc-gen-go-grpc
  (main module does not need module google.golang.org/grpc/cmd/protoc-gen-go-grpc)
  

More info:

go.sum includes this line (generated automatically when i run go mod tidy):

google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=

Any ideas on how to identify and hence update the module will be much appreciated.