diff --git a/internal/pkg/ofagent/changeEvent.go b/internal/pkg/ofagent/changeEvent.go
index 6a79d42..cb7c965 100644
--- a/internal/pkg/ofagent/changeEvent.go
+++ b/internal/pkg/ofagent/changeEvent.go
@@ -24,7 +24,7 @@
 	"github.com/golang/protobuf/ptypes/empty"
 	ofp "github.com/opencord/goloxi/of13"
 	"github.com/opencord/ofagent-go/internal/pkg/openflow"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 	"google.golang.org/grpc"
 )
 
diff --git a/internal/pkg/ofagent/common.go b/internal/pkg/ofagent/common.go
index dd5659e..a4f62ed 100644
--- a/internal/pkg/ofagent/common.go
+++ b/internal/pkg/ofagent/common.go
@@ -18,7 +18,7 @@
 package ofagent
 
 import (
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 )
 
 var logger log.CLogger
diff --git a/internal/pkg/ofagent/connection.go b/internal/pkg/ofagent/connection.go
index a518638..6bfd0af 100644
--- a/internal/pkg/ofagent/connection.go
+++ b/internal/pkg/ofagent/connection.go
@@ -23,9 +23,9 @@
 	"github.com/golang/protobuf/ptypes/empty"
 	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
 	grpc_opentracing "github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-lib-go/v3/pkg/probe"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/probe"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"google.golang.org/grpc"
 )
 
diff --git a/internal/pkg/ofagent/ofagent.go b/internal/pkg/ofagent/ofagent.go
index 9e0914f..e2b66f3 100644
--- a/internal/pkg/ofagent/ofagent.go
+++ b/internal/pkg/ofagent/ofagent.go
@@ -23,9 +23,10 @@
 
 	"github.com/opencord/ofagent-go/internal/pkg/holder"
 	"github.com/opencord/ofagent-go/internal/pkg/openflow"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-lib-go/v3/pkg/probe"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/probe"
+	"github.com/opencord/voltha-protos/v4/go/openflow_13"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"google.golang.org/grpc"
 )
 
@@ -58,7 +59,7 @@
 
 	packetInChannel    chan *voltha.PacketIn
 	packetOutChannel   chan *voltha.PacketOut
-	changeEventChannel chan *voltha.ChangeEvent
+	changeEventChannel chan *openflow_13.ChangeEvent
 }
 
 func NewOFAgent(ctx context.Context, config *OFAgent) (*OFAgent, error) {
@@ -71,7 +72,7 @@
 		volthaClient:              &holder.VolthaServiceClientHolder{},
 		packetInChannel:           make(chan *voltha.PacketIn),
 		packetOutChannel:          make(chan *voltha.PacketOut),
-		changeEventChannel:        make(chan *voltha.ChangeEvent),
+		changeEventChannel:        make(chan *openflow_13.ChangeEvent),
 		clientMap:                 make(map[string]*openflow.OFClient),
 		events:                    make(chan ofaEvent, 100),
 	}
diff --git a/internal/pkg/ofagent/packetIn.go b/internal/pkg/ofagent/packetIn.go
index 4d28410..f3555ae 100644
--- a/internal/pkg/ofagent/packetIn.go
+++ b/internal/pkg/ofagent/packetIn.go
@@ -24,9 +24,9 @@
 	"github.com/opencord/goloxi"
 	ofp "github.com/opencord/goloxi/of13"
 	"github.com/opencord/ofagent-go/internal/pkg/openflow"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-protos/v3/go/openflow_13"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-protos/v4/go/openflow_13"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"google.golang.org/grpc"
 )
 
diff --git a/internal/pkg/ofagent/packetOut.go b/internal/pkg/ofagent/packetOut.go
index 6fe6546..aee7b75 100644
--- a/internal/pkg/ofagent/packetOut.go
+++ b/internal/pkg/ofagent/packetOut.go
@@ -20,7 +20,7 @@
 	"context"
 	"encoding/json"
 
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 	"google.golang.org/grpc"
 )
 
diff --git a/internal/pkg/ofagent/refresh.go b/internal/pkg/ofagent/refresh.go
index 55865ca..8025ba7 100644
--- a/internal/pkg/ofagent/refresh.go
+++ b/internal/pkg/ofagent/refresh.go
@@ -22,7 +22,7 @@
 
 	"github.com/golang/protobuf/ptypes/empty"
 	"github.com/opencord/ofagent-go/internal/pkg/openflow"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 )
 
 func (ofa *OFAgent) synchronizeDeviceList(ctx context.Context) {