diff --git a/Makefile b/Makefile
index 14e68f2..76fa0f0 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@
 
 ## Variables
 OPENOLTDEVICE     ?= asfvolt16
-OPENOLT_PROTO_VER ?= v4.1.5
+OPENOLT_PROTO_VER ?= v4.2.0
 
 DOCKER                     ?= docker
 DOCKER_REGISTRY            ?=