diff --git a/Makefile b/Makefile
index b9dcf5f..9598444 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@
 
 ## Variables
 OPENOLTDEVICE     ?= asfvolt16
-OPENOLT_PROTO_VER ?= v3.1.0
+OPENOLT_PROTO_VER ?= v3.3.4
 GTEST_VER         ?= release-1.8.0
 CMOCK_VER         ?= 0207b30
 GMOCK_GLOBAL_VER  ?= 1.0.2