diff --git a/agent/Makefile.in b/agent/Makefile.in
index 25aefc5..c62baf8 100644
--- a/agent/Makefile.in
+++ b/agent/Makefile.in
@@ -43,7 +43,7 @@
 # This specifies the GIT tag in https://github.com/opencord/voltha-protos
 # repo that we need to refer to, to pick the right version of
 # openolt.proto and tech_profile.proto
-OPENOLT_PROTO_VER ?= v4.1.5
+OPENOLT_PROTO_VER ?= v4.2.0
 
 # Variables used for Inband build
 INBAND = "n"