diff --git a/agent/Makefile.in b/agent/Makefile.in
index ad1a0b9..2f86ada 100644
--- a/agent/Makefile.in
+++ b/agent/Makefile.in
@@ -42,7 +42,7 @@
 # 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 ?= v3.3.9
+OPENOLT_PROTO_VER ?= v3.4.3
 
 # Variables used for Inband build
 INBAND = "n"