diff --git a/go.mod b/go.mod
index 5eccc7f..ba0bcfa 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/sagernet/gvisor v0.0.0-20241123041152-536d05261cff
 	github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a
 	github.com/sagernet/nftables v0.3.0-beta.4
-	github.com/sagernet/sing v0.6.0-alpha.24
+	github.com/sagernet/sing v0.6.0-alpha.25
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
 	golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8
 	golang.org/x/net v0.26.0
diff --git a/go.sum b/go.sum
index 75e6c72..8b45e30 100644
--- a/go.sum
+++ b/go.sum
@@ -22,8 +22,8 @@ github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a h1:ObwtHN2VpqE0ZN
 github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a/go.mod h1:xLnfdiJbSp8rNqYEdIW/6eDO4mVoogml14Bh2hSiFpM=
 github.com/sagernet/nftables v0.3.0-beta.4 h1:kbULlAwAC3jvdGAC1P5Fa3GSxVwQJibNenDW2zaXr8I=
 github.com/sagernet/nftables v0.3.0-beta.4/go.mod h1:OQXAjvjNGGFxaTgVCSTRIhYB5/llyVDeapVoENYBDS8=
-github.com/sagernet/sing v0.6.0-alpha.24 h1:qPc9i0mHADIFNYlWMg7fWWZZ0kBxWHEs8npsAG6KqAo=
-github.com/sagernet/sing v0.6.0-alpha.24/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
+github.com/sagernet/sing v0.6.0-alpha.25 h1:r/UxU+1O6436MjvEXEMRfBBtqMEImgA6uqxezXKZ/Rs=
+github.com/sagernet/sing v0.6.0-alpha.25/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/vishvananda/netns v0.0.4 h1:Oeaw1EM2JMxD51g9uhtC0D7erkIjgmj8+JZc26m1YX8=
 github.com/vishvananda/netns v0.0.4/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
diff --git a/stack_gvisor.go b/stack_gvisor.go
index ccf9a8b..65bb7bd 100644
--- a/stack_gvisor.go
+++ b/stack_gvisor.go
@@ -34,7 +34,6 @@ type GVisor struct {
 	logger        logger.Logger
 	stack         *stack.Stack
 	endpoint      stack.LinkEndpoint
-	udpForwarder  *UDPForwarder
 }
 
 type GVisorTun interface {
@@ -72,11 +71,9 @@ func (t *GVisor) Start() error {
 		return err
 	}
 	ipStack.SetTransportProtocolHandler(tcp.ProtocolNumber, NewTCPForwarder(t.ctx, ipStack, t.handler).HandlePacket)
-	udpForwarder := NewUDPForwarder(t.ctx, ipStack, t.handler, t.udpTimeout)
-	ipStack.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)
+	ipStack.SetTransportProtocolHandler(udp.ProtocolNumber, NewUDPForwarder(t.ctx, ipStack, t.handler, t.udpTimeout).HandlePacket)
 	t.stack = ipStack
 	t.endpoint = linkEndpoint
-	t.udpForwarder = udpForwarder
 	return nil
 }
 
@@ -89,7 +86,6 @@ func (t *GVisor) Close() error {
 	for _, endpoint := range t.stack.CleanupEndpoints() {
 		endpoint.Abort()
 	}
-	t.udpForwarder.Close()
 	return nil
 }
 
diff --git a/stack_gvisor_udp.go b/stack_gvisor_udp.go
index 284fedf..3027798 100644
--- a/stack_gvisor_udp.go
+++ b/stack_gvisor_udp.go
@@ -37,16 +37,10 @@ func NewUDPForwarder(ctx context.Context, stack *stack.Stack, handler Handler, t
 		stack:   stack,
 		handler: handler,
 	}
-	udpNat := udpnat.New(handler, forwarder.PreparePacketConnection, timeout, true)
-	udpNat.Start()
-	forwarder.udpNat = udpNat
+	forwarder.udpNat = udpnat.New(handler, forwarder.PreparePacketConnection, timeout, true)
 	return forwarder
 }
 
-func (f *UDPForwarder) Close() {
-	f.udpNat.Close()
-}
-
 func (f *UDPForwarder) HandlePacket(id stack.TransportEndpointID, pkt *stack.PacketBuffer) bool {
 	source := M.SocksaddrFrom(AddrFromAddress(id.RemoteAddress), id.RemotePort)
 	destination := M.SocksaddrFrom(AddrFromAddress(id.LocalAddress), id.LocalPort)
diff --git a/stack_mixed.go b/stack_mixed.go
index c2eca96..9293fb8 100644
--- a/stack_mixed.go
+++ b/stack_mixed.go
@@ -16,9 +16,8 @@ import (
 
 type Mixed struct {
 	*System
-	stack        *stack.Stack
-	endpoint     *channel.Endpoint
-	udpForwarder *UDPForwarder
+	stack    *stack.Stack
+	endpoint *channel.Endpoint
 }
 
 func NewMixed(
@@ -43,11 +42,9 @@ func (m *Mixed) Start() error {
 	if err != nil {
 		return err
 	}
-	udpForwarder := NewUDPForwarder(m.ctx, ipStack, m.handler, m.udpTimeout)
-	ipStack.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)
+	ipStack.SetTransportProtocolHandler(udp.ProtocolNumber, NewUDPForwarder(m.ctx, ipStack, m.handler, m.udpTimeout).HandlePacket)
 	m.stack = ipStack
 	m.endpoint = endpoint
-	m.udpForwarder = udpForwarder
 	go m.tunLoop()
 	go m.packetLoop()
 	return nil
@@ -62,7 +59,6 @@ func (m *Mixed) Close() error {
 	for _, endpoint := range m.stack.CleanupEndpoints() {
 		endpoint.Abort()
 	}
-	m.udpNat.Close()
 	return m.System.Close()
 }