diff --git a/app/proxyman/outbound/handler.go b/app/proxyman/outbound/handler.go
index bdbbef8ec..046c86b23 100644
--- a/app/proxyman/outbound/handler.go
+++ b/app/proxyman/outbound/handler.go
@@ -202,7 +202,7 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (internet.Conn
 			outbound.Gateway = h.senderSettings.Via.AsAddress()
 		}
 	}
-	var enablePacketAddrCapture = true
+	enablePacketAddrCapture := true
 	if h.senderSettings != nil && h.senderSettings.ProxySettings != nil && h.senderSettings.ProxySettings.HasTag() && h.senderSettings.ProxySettings.TransportLayerProxy {
 		tag := h.senderSettings.ProxySettings.Tag
 		newError("transport layer proxying to ", tag, " for dest ", dest).AtDebug().WriteToLog(session.ExportIDToError(ctx))
diff --git a/common/net/packetaddr/connection_adaptor.go b/common/net/packetaddr/connection_adaptor.go
index a95b1b12f..4364a6d33 100644
--- a/common/net/packetaddr/connection_adaptor.go
+++ b/common/net/packetaddr/connection_adaptor.go
@@ -6,16 +6,18 @@ import (
 	"sync"
 	"time"
 
-	"github.com/v2fly/v2ray-core/v4/common"
-	"github.com/v2fly/v2ray-core/v4/common/buf"
-	"github.com/v2fly/v2ray-core/v4/common/errors"
-	"github.com/v2fly/v2ray-core/v4/common/net"
-	"github.com/v2fly/v2ray-core/v4/features/routing"
-	"github.com/v2fly/v2ray-core/v4/transport"
+	"github.com/v2fly/v2ray-core/v5/common"
+	"github.com/v2fly/v2ray-core/v5/common/buf"
+	"github.com/v2fly/v2ray-core/v5/common/errors"
+	"github.com/v2fly/v2ray-core/v5/common/net"
+	"github.com/v2fly/v2ray-core/v5/features/routing"
+	"github.com/v2fly/v2ray-core/v5/transport"
 )
 
-var errNotPacketConn = errors.New("not a packet connection")
-var errUnsupported = errors.New("unsupported action")
+var (
+	errNotPacketConn = errors.New("not a packet connection")
+	errUnsupported   = errors.New("unsupported action")
+)
 
 func ToPacketAddrConn(link *transport.Link, dest net.Destination) (net.PacketConn, error) {
 	if !dest.Address.Family().IsDomain() {
@@ -80,6 +82,9 @@ func (c *packetConnectionAdaptor) WriteTo(p []byte, addr gonet.Addr) (n int, err
 	payloadLen := len(p)
 	var buffer *buf.Buffer
 	buffer, err = AttachAddressToPacket(buf.FromBytes(p), addr)
+	if err != nil {
+		return 0, err
+	}
 	mb := buf.MultiBuffer{buffer}
 	err = c.link.Writer.WriteMultiBuffer(mb)
 	if err != nil {
diff --git a/common/net/packetaddr/packetaddr.go b/common/net/packetaddr/packetaddr.go
index b1add37ff..58e58675c 100644
--- a/common/net/packetaddr/packetaddr.go
+++ b/common/net/packetaddr/packetaddr.go
@@ -2,10 +2,11 @@ package packetaddr
 
 import (
 	"bytes"
-	"github.com/v2fly/v2ray-core/v4/common/buf"
-	"github.com/v2fly/v2ray-core/v4/common/net"
-	"github.com/v2fly/v2ray-core/v4/common/protocol"
 	gonet "net"
+
+	"github.com/v2fly/v2ray-core/v5/common/buf"
+	"github.com/v2fly/v2ray-core/v5/common/net"
+	"github.com/v2fly/v2ray-core/v5/common/protocol"
 )
 
 var addrParser = protocol.NewAddressParser(
@@ -44,7 +45,7 @@ func ExtractAddressFromPacket(data *buf.Buffer) (*buf.Buffer, gonet.Addr, error)
 	if err != nil {
 		return nil, nil, err
 	}
-	var addr = &gonet.UDPAddr{
+	addr := &gonet.UDPAddr{
 		IP:   address.IP(),
 		Port: int(port.Value()),
 		Zone: "",
diff --git a/common/net/packetaddr/packetaddr_test.go b/common/net/packetaddr/packetaddr_test.go
index e324ce2fe..e3cc8c0f2 100644
--- a/common/net/packetaddr/packetaddr_test.go
+++ b/common/net/packetaddr/packetaddr_test.go
@@ -1,10 +1,12 @@
 package packetaddr
 
 import (
-	"github.com/stretchr/testify/assert"
-	"github.com/v2fly/v2ray-core/v4/common/buf"
 	sysnet "net"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/v2fly/v2ray-core/v4/common/buf"
 )
 
 func TestPacketEncodingIPv4(t *testing.T) {
diff --git a/proxy/socks/client.go b/proxy/socks/client.go
index bf1662378..3e2c38e99 100644
--- a/proxy/socks/client.go
+++ b/proxy/socks/client.go
@@ -2,9 +2,10 @@ package socks
 
 import (
 	"context"
+	"time"
+
 	"github.com/v2fly/v2ray-core/v4/common/net/packetaddr"
 	"github.com/v2fly/v2ray-core/v4/transport/internet/udp"
-	"time"
 
 	core "github.com/v2fly/v2ray-core/v5"
 	"github.com/v2fly/v2ray-core/v5/common"
diff --git a/proxy/socks/protocol.go b/proxy/socks/protocol.go
index 4bfdbef5d..32c8c690b 100644
--- a/proxy/socks/protocol.go
+++ b/proxy/socks/protocol.go
@@ -390,9 +390,9 @@ func (r *UDPReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 	return buf.MultiBuffer{b}, nil
 }
 
-func (v *UDPReader) ReadFrom(p []byte) (n int, addr gonet.Addr, err error) {
+func (r *UDPReader) ReadFrom(p []byte) (n int, addr gonet.Addr, err error) {
 	buffer := buf.New()
-	_, err = buffer.ReadFrom(v.reader)
+	_, err = buffer.ReadFrom(r.reader)
 	if err != nil {
 		buffer.Release()
 		return 0, nil, err
diff --git a/proxy/socks/server.go b/proxy/socks/server.go
index a7937179d..f333e648d 100644
--- a/proxy/socks/server.go
+++ b/proxy/socks/server.go
@@ -2,7 +2,6 @@ package socks
 
 import (
 	"context"
-	"github.com/v2fly/v2ray-core/v4/common/net/packetaddr"
 	"io"
 	"time"
 
@@ -11,6 +10,7 @@ import (
 	"github.com/v2fly/v2ray-core/v5/common/buf"
 	"github.com/v2fly/v2ray-core/v5/common/log"
 	"github.com/v2fly/v2ray-core/v5/common/net"
+	"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
 	"github.com/v2fly/v2ray-core/v5/common/protocol"
 	udp_proto "github.com/v2fly/v2ray-core/v5/common/protocol/udp"
 	"github.com/v2fly/v2ray-core/v5/common/session"
diff --git a/transport/internet/udp/copy.go b/transport/internet/udp/copy.go
index f5f83e38d..fdc3ce58c 100644
--- a/transport/internet/udp/copy.go
+++ b/transport/internet/udp/copy.go
@@ -3,8 +3,8 @@ package udp
 import (
 	gonet "net"
 
-	"github.com/v2fly/v2ray-core/v4/common/signal"
-	"github.com/v2fly/v2ray-core/v4/transport/internet"
+	"github.com/v2fly/v2ray-core/v5/common/signal"
+	"github.com/v2fly/v2ray-core/v5/transport/internet"
 )
 
 type dataHandler func(content []byte, address gonet.Addr)
@@ -31,7 +31,7 @@ func CopyPacketConn(dst internet.AbstractPacketConnWriter, src internet.Abstract
 			handler(buffer[:n], addr)
 		}
 
-		n, err = dst.WriteTo(buffer[:n], addr)
+		_, err = dst.WriteTo(buffer[:n], addr)
 		if err != nil {
 			return err
 		}
diff --git a/transport/internet/udp/dispatcher.go b/transport/internet/udp/dispatcher.go
index 26ae09fa0..c52021c6f 100644
--- a/transport/internet/udp/dispatcher.go
+++ b/transport/internet/udp/dispatcher.go
@@ -2,6 +2,7 @@ package udp
 
 import (
 	"context"
+
 	"github.com/v2fly/v2ray-core/v5/common"
 	"github.com/v2fly/v2ray-core/v5/common/buf"
 	"github.com/v2fly/v2ray-core/v5/common/net"
diff --git a/transport/internet/udp/dispatcher_packetaddr.go b/transport/internet/udp/dispatcher_packetaddr.go
index 0785eb1f9..ac1a5595f 100644
--- a/transport/internet/udp/dispatcher_packetaddr.go
+++ b/transport/internet/udp/dispatcher_packetaddr.go
@@ -2,11 +2,12 @@ package udp
 
 import (
 	"context"
-	"github.com/v2fly/v2ray-core/v4/common/buf"
-	"github.com/v2fly/v2ray-core/v4/common/net"
-	"github.com/v2fly/v2ray-core/v4/common/net/packetaddr"
-	"github.com/v2fly/v2ray-core/v4/common/protocol/udp"
-	"github.com/v2fly/v2ray-core/v4/features/routing"
+
+	"github.com/v2fly/v2ray-core/v5/common/buf"
+	"github.com/v2fly/v2ray-core/v5/common/net"
+	"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
+	"github.com/v2fly/v2ray-core/v5/common/protocol/udp"
+	"github.com/v2fly/v2ray-core/v5/features/routing"
 )
 
 type PacketAddrDispatcher struct {
@@ -25,6 +26,7 @@ func (p PacketAddrDispatcher) Dispatch(ctx context.Context, destination net.Dest
 	}
 	p.conn.WriteTo(payload.Bytes(), &net.UDPAddr{IP: destination.Address.IP(), Port: int(destination.Port.Value())})
 }
+
 func (p PacketAddrDispatcher) readWorker() {
 	for {
 		readBuf := buf.New()