diff --git a/internal/pkg/core/openolt_eventmgr_test.go b/internal/pkg/core/openolt_eventmgr_test.go
index 84dff0b..955bee9 100644
--- a/internal/pkg/core/openolt_eventmgr_test.go
+++ b/internal/pkg/core/openolt_eventmgr_test.go
@@ -24,7 +24,7 @@
 	"time"
 
 	"github.com/opencord/voltha-openolt-adapter/pkg/mocks"
-	oop "github.com/opencord/voltha-protos/v3/go/openolt"
+	oop "github.com/opencord/voltha-protos/v4/go/openolt"
 )
 
 func mockEventMgr() *OpenOltEventMgr {