diff --git a/go.mod b/go.mod
index 088297b..dfdb9f5 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/protobuf v1.3.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4
-	github.com/opencord/voltha-lib-go/v4 v4.0.12
+	github.com/opencord/voltha-lib-go/v4 v4.1.0
 	github.com/opencord/voltha-protos/v4 v4.0.14
 	go.etcd.io/etcd v0.0.0-20190930204107-236ac2a90522
 	google.golang.org/grpc v1.25.1
diff --git a/go.sum b/go.sum
index 3a78239..bb852d3 100644
--- a/go.sum
+++ b/go.sum
@@ -142,8 +142,8 @@
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/gomega v1.4.2 h1:3mYCb7aPxS/RU7TI1y4rkEn1oKmPRjNJLNEXgw7MH2I=
 github.com/onsi/gomega v1.4.2/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
-github.com/opencord/voltha-lib-go/v4 v4.0.12 h1:hKE9UqVF9NHmwieWOlzdHM119NF5U5YaOyEvwlabwI8=
-github.com/opencord/voltha-lib-go/v4 v4.0.12/go.mod h1:K7lDkSkJ97EyfvX8fQtBmBvpj7n6MmwnAtD8Jz79HcQ=
+github.com/opencord/voltha-lib-go/v4 v4.1.0 h1:Ba6w5bv36oYrzqfK96f42+hSEMkukwIjpdBWPztLY1g=
+github.com/opencord/voltha-lib-go/v4 v4.1.0/go.mod h1:K7lDkSkJ97EyfvX8fQtBmBvpj7n6MmwnAtD8Jz79HcQ=
 github.com/opencord/voltha-protos/v4 v4.0.12 h1:x8drb8inaUByjVLFbXSiQwRTU//dfde0MKIHyKb1JMw=
 github.com/opencord/voltha-protos/v4 v4.0.12/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
 github.com/opencord/voltha-protos/v4 v4.0.14 h1:5Zofvc3E+us/3N0HYEqGdVc2yuEoyaFDs8Rd/C4+ELE=
diff --git a/internal/pkg/core/device_handler.go b/internal/pkg/core/device_handler.go
index ec5bf84..1e86007 100644
--- a/internal/pkg/core/device_handler.go
+++ b/internal/pkg/core/device_handler.go
@@ -2146,25 +2146,18 @@
 }
 
 // ChildDeviceLost deletes ONU and clears pon resources related to it.
-func (dh *DeviceHandler) ChildDeviceLost(ctx context.Context, pPortNo uint32, onuID uint32) error {
+func (dh *DeviceHandler) ChildDeviceLost(ctx context.Context, pPortNo uint32, onuID uint32, onuSn string) error {
 	logger.Debugw(ctx, "child-device-lost", log.Fields{"parent-device-id": dh.device.Id})
 	intfID := PortNoToIntfID(pPortNo, voltha.Port_PON_OLT)
 	onuKey := dh.formOnuKey(intfID, onuID)
-	onuDevice, ok := dh.onus.Load(onuKey)
-	if !ok {
-		return olterrors.NewErrAdapter("failed-to-load-onu-details",
-			log.Fields{
-				"device-id": dh.device.Id,
-				"onu-id":    onuID,
-				"intf-id":   intfID}, nil).Log()
-	}
+
 	var sn *oop.SerialNumber
 	var err error
-	if sn, err = dh.deStringifySerialNumber(onuDevice.(*OnuDevice).serialNumber); err != nil {
+	if sn, err = dh.deStringifySerialNumber(onuSn); err != nil {
 		return olterrors.NewErrAdapter("failed-to-destringify-serial-number",
 			log.Fields{
 				"devicer-id":    dh.device.Id,
-				"serial-number": onuDevice.(*OnuDevice).serialNumber}, err).Log()
+				"serial-number": onuSn}, err).Log()
 	}
 
 	onu := &oop.Onu{IntfId: intfID, OnuId: onuID, SerialNumber: sn}
@@ -2187,7 +2180,7 @@
 				"error":     err})
 		} else {
 			for i, onu := range onuGemData {
-				if onu.OnuID == onuID && onu.SerialNumber == onuDevice.(*OnuDevice).serialNumber {
+				if onu.OnuID == onuID && onu.SerialNumber == onuSn {
 					logger.Debugw(ctx, "onu-data", log.Fields{"onu": onu})
 					if err := dh.clearUNIData(ctx, &onu); err != nil {
 						logger.Warnw(ctx, "failed-to-clear-uni-data-for-onu", log.Fields{
@@ -2217,7 +2210,7 @@
 		}
 	}
 	dh.onus.Delete(onuKey)
-	dh.discOnus.Delete(onuDevice.(*OnuDevice).serialNumber)
+	dh.discOnus.Delete(onuSn)
 	return nil
 }
 
diff --git a/internal/pkg/core/openolt.go b/internal/pkg/core/openolt.go
index eebed78..a590846 100644
--- a/internal/pkg/core/openolt.go
+++ b/internal/pkg/core/openolt.go
@@ -350,12 +350,12 @@
 }
 
 //Child_device_lost deletes the ONU and its references from PONResources
-func (oo *OpenOLT) Child_device_lost(ctx context.Context, deviceID string, pPortNo uint32, onuID uint32) error {
-	logger.Infow(ctx, "Child-device-lost", log.Fields{"parent-device-id": deviceID})
-	if handler := oo.getDeviceHandler(deviceID); handler != nil {
-		return handler.ChildDeviceLost(ctx, pPortNo, onuID)
+func (oo *OpenOLT) Child_device_lost(ctx context.Context, childDevice *voltha.Device) error {
+	logger.Infow(ctx, "Child-device-lost", log.Fields{"parent-device-id": childDevice.ParentId, "child-device-id": childDevice.Id})
+	if handler := oo.getDeviceHandler(childDevice.ParentId); handler != nil {
+		return handler.ChildDeviceLost(ctx, childDevice.ParentPortNo, childDevice.ProxyAddress.OnuId, childDevice.SerialNumber)
 	}
-	return olterrors.NewErrNotFound("device-handler", log.Fields{"device-id": deviceID}, nil).Log()
+	return olterrors.NewErrNotFound("device-handler", log.Fields{"device-id": childDevice.ParentId}, nil).Log()
 }
 
 //Start_omci_test not implemented
diff --git a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/common/request_handler.go b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/common/request_handler.go
index 459cac5..5a333c7 100644
--- a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/common/request_handler.go
+++ b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/common/request_handler.go
@@ -708,30 +708,17 @@
 }
 
 func (rhp *RequestHandlerProxy) Child_device_lost(ctx context.Context, args []*ic.Argument) error {
-	if len(args) < 4 {
+	if len(args) < 2 {
 		logger.Warn(ctx, "invalid-number-of-args", log.Fields{"args": args})
 		return errors.New("invalid-number-of-args")
 	}
-
-	pDeviceId := &ic.StrType{}
-	pPortNo := &ic.IntType{}
-	onuID := &ic.IntType{}
+	childDevice := &voltha.Device{}
 	fromTopic := &ic.StrType{}
 	for _, arg := range args {
 		switch arg.Key {
-		case "pDeviceId":
-			if err := ptypes.UnmarshalAny(arg.Value, pDeviceId); err != nil {
-				logger.Warnw(ctx, "cannot-unmarshal-parent-deviceId", log.Fields{"error": err})
-				return err
-			}
-		case "pPortNo":
-			if err := ptypes.UnmarshalAny(arg.Value, pPortNo); err != nil {
-				logger.Warnw(ctx, "cannot-unmarshal-port", log.Fields{"error": err})
-				return err
-			}
-		case "onuID":
-			if err := ptypes.UnmarshalAny(arg.Value, onuID); err != nil {
-				logger.Warnw(ctx, "cannot-unmarshal-transaction-ID", log.Fields{"error": err})
+		case "childDevice":
+			if err := ptypes.UnmarshalAny(arg.Value, childDevice); err != nil {
+				logger.Warnw(ctx, "cannot-unmarshal-child-device", log.Fields{"error": err})
 				return err
 			}
 		case kafka.FromTopic:
@@ -742,9 +729,9 @@
 		}
 	}
 	//Update the core reference for that device
-	rhp.coreProxy.UpdateCoreReference(pDeviceId.Val, fromTopic.Val)
+	rhp.coreProxy.UpdateCoreReference(childDevice.ParentId, fromTopic.Val)
 	//Invoke the Child_device_lost API on the adapter
-	if err := rhp.adapter.Child_device_lost(ctx, pDeviceId.Val, uint32(pPortNo.Val), uint32(onuID.Val)); err != nil {
+	if err := rhp.adapter.Child_device_lost(ctx, childDevice); err != nil {
 		return status.Errorf(codes.NotFound, "%s", err.Error())
 	}
 	return nil
diff --git a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/iAdapter.go b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/iAdapter.go
index dfc3778..92a33e7 100644
--- a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/iAdapter.go
+++ b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/iAdapter.go
@@ -53,7 +53,7 @@
 	Revert_image_update(ctx context.Context, device *voltha.Device, request *voltha.ImageDownload) (*voltha.ImageDownload, error)
 	Enable_port(ctx context.Context, deviceId string, port *voltha.Port) error
 	Disable_port(ctx context.Context, deviceId string, port *voltha.Port) error
-	Child_device_lost(ctx context.Context, parentDeviceId string, parentPortNo uint32, onuID uint32) error
+	Child_device_lost(ctx context.Context, childDevice *voltha.Device) error
 	Start_omci_test(ctx context.Context, device *voltha.Device, request *voltha.OmciTestRequest) (*voltha.TestResponse, error)
 	Get_ext_value(ctx context.Context, deviceId string, device *voltha.Device, valueflag voltha.ValueType_Type) (*voltha.ReturnValues, error)
 	Single_get_value_request(ctx context.Context, request extension.SingleGetValueRequest) (*extension.SingleGetValueResponse, error)
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 1c5edf9..7e4c2b9 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -52,7 +52,7 @@
 # github.com/jcmturner/gofork v1.0.0
 github.com/jcmturner/gofork/encoding/asn1
 github.com/jcmturner/gofork/x/crypto/pbkdf2
-# github.com/opencord/voltha-lib-go/v4 v4.0.12
+# github.com/opencord/voltha-lib-go/v4 v4.1.0
 github.com/opencord/voltha-lib-go/v4/pkg/adapters
 github.com/opencord/voltha-lib-go/v4/pkg/adapters/adapterif
 github.com/opencord/voltha-lib-go/v4/pkg/adapters/common