gRPC migration

Change-Id: Ib390f6dde0d5a8d6db12ccd7da41135570ad1354
diff --git a/internal/common/helpers.go b/internal/common/helpers.go
index 6153283..d0d3cf1 100644
--- a/internal/common/helpers.go
+++ b/internal/common/helpers.go
@@ -20,7 +20,7 @@
 	"net"
 	"strconv"
 
-	"github.com/opencord/voltha-protos/v4/go/openolt"
+	"github.com/opencord/voltha-protos/v5/go/openolt"
 )
 
 func OnuSnToString(sn *openolt.SerialNumber) string {