diff --git a/Gopkg.toml b/Gopkg.toml
index 65255b0..796ff2a 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -61,7 +61,7 @@
 
 [[constraint]]
   name = "github.com/golang/protobuf"
-  version = "1.2.0"
+  version = "=1.3.1"
 
 [[constraint]]
   name = "github.com/google/uuid"
@@ -102,3 +102,7 @@
 [prune]
   go-tests = true
   unused-packages = true
+
+  [[prune.project]]
+    name = "github.com/opencord/voltha-protos"
+    unused-packages = false