diff --git a/go.mod b/go.mod
index 437fbab..3284a7e 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/sagernet/sing-shadowtls
 go 1.20
 
 require (
-	github.com/sagernet/sing v0.5.0
+	github.com/sagernet/sing v0.6.0-alpha.16
 	golang.org/x/crypto v0.29.0
 	golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56
 )
diff --git a/go.sum b/go.sum
index c7acb4e..c869cc3 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/sagernet/sing v0.5.0 h1:soo2wVwLcieKWWKIksFNK6CCAojUgAppqQVwyRYGkEM=
-github.com/sagernet/sing v0.5.0/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
+github.com/sagernet/sing v0.6.0-alpha.16 h1:Ml+nJa8J9d+Svqv2pBvJoet+8PF302Snb6wcMUXaoy4=
+github.com/sagernet/sing v0.6.0-alpha.16/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 golang.org/x/crypto v0.29.0 h1:L5SG1JTTXupVV3n6sUqMTeWbjAyfPwoda2DLX8J8FrQ=
 golang.org/x/crypto v0.29.0/go.mod h1:+F4F4N5hv6v38hfeYwTdx20oUvLLc+QfrE9Ax9HtgRg=
diff --git a/service.go b/service.go
index b2ef5b4..15a1aaa 100644
--- a/service.go
+++ b/service.go
@@ -20,6 +20,17 @@ import (
 	"github.com/sagernet/sing/common/task"
 )
 
+type Service struct {
+	version                int
+	password               string
+	users                  []User
+	handshake              HandshakeConfig
+	handshakeForServerName map[string]HandshakeConfig
+	strictMode             bool
+	handler                N.TCPConnectionHandlerEx
+	logger                 logger.ContextLogger
+}
+
 type ServiceConfig struct {
 	Version                int
 	Password               string // for protocol version 2
@@ -27,7 +38,7 @@ type ServiceConfig struct {
 	Handshake              HandshakeConfig
 	HandshakeForServerName map[string]HandshakeConfig // for protocol version 2/3
 	StrictMode             bool                       // for protocol version 3
-	Handler                Handler
+	Handler                N.TCPConnectionHandlerEx
 	Logger                 logger.ContextLogger
 }
 
@@ -41,22 +52,6 @@ type HandshakeConfig struct {
 	Dialer N.Dialer
 }
 
-type Handler interface {
-	N.TCPConnectionHandler
-	E.Handler
-}
-
-type Service struct {
-	version                int
-	password               string
-	users                  []User
-	handshake              HandshakeConfig
-	handshakeForServerName map[string]HandshakeConfig
-	strictMode             bool
-	handler                Handler
-	logger                 logger.ContextLogger
-}
-
 func NewService(config ServiceConfig) (*Service, error) {
 	service := &Service{
 		version:                config.Version,
@@ -99,7 +94,7 @@ func (s *Service) selectHandshake(clientHelloFrame *buf.Buffer) HandshakeConfig
 	return s.handshake
 }
 
-func (s *Service) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
+func (s *Service) NewConnection(ctx context.Context, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) error {
 	switch s.version {
 	default:
 		fallthrough
@@ -125,7 +120,8 @@ func (s *Service) NewConnection(ctx context.Context, conn net.Conn, metadata M.M
 			return err
 		}
 		s.logger.TraceContext(ctx, "handshake finished")
-		return s.handler.NewConnection(ctx, conn, metadata)
+		s.handler.NewConnectionEx(ctx, conn, source, destination, onClose)
+		return nil
 	case 2:
 		clientHelloFrame, err := extractFrame(conn)
 		if err != nil {
@@ -144,7 +140,8 @@ func (s *Service) NewConnection(ctx context.Context, conn net.Conn, metadata M.M
 		if err == nil {
 			s.logger.TraceContext(ctx, "handshake finished")
 			handshakeConn.Close()
-			return s.handler.NewConnection(ctx, bufio.NewCachedConn(newConn(conn), request), metadata)
+			s.handler.NewConnectionEx(ctx, bufio.NewCachedConn(newConn(conn), request), source, destination, onClose)
+			return nil
 		} else if err == os.ErrPermission {
 			s.logger.WarnContext(ctx, "fallback connection")
 			hashConn.Fallback()
@@ -247,6 +244,7 @@ func (s *Service) NewConnection(ctx context.Context, conn net.Conn, metadata M.M
 			return E.Cause(err, "handshake relay")
 		}
 		s.logger.TraceContext(ctx, "handshake relay finished")
-		return s.handler.NewConnection(ctx, bufio.NewCachedConn(newVerifiedConn(conn, hmacAdd, hmacVerify, nil), clientFirstFrame), metadata)
+		s.handler.NewConnectionEx(ctx, bufio.NewCachedConn(newVerifiedConn(conn, hmacAdd, hmacVerify, nil), clientFirstFrame), source, destination, onClose)
+		return nil
 	}
 }