diff --git a/agent/Makefile.in b/agent/Makefile.in
index 0e4bded..a5407ea 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 ?= v3.1.0
+OPENOLT_PROTO_VER ?= v3.3.4
 
 #
 # Build directory
diff --git a/agent/test/Makefile b/agent/test/Makefile
index 4d0fa6f..91b7a70 100644
--- a/agent/test/Makefile
+++ b/agent/test/Makefile
@@ -21,7 +21,7 @@
 TOP_DIR=`pwd`
 OPENOLTDEVICE ?= asfvolt16
 
-OPENOLT_PROTO_VER ?= v3.1.0
+OPENOLT_PROTO_VER ?= v3.3.4
 
 GTEST_VER ?= release-1.8.0
 gtest-target = /usr/local/lib/libgtest.a