diff --git a/.github/update_dependencies.sh b/.github/update_dependencies.sh
index 2ec62da..d63123b 100755
--- a/.github/update_dependencies.sh
+++ b/.github/update_dependencies.sh
@@ -2,5 +2,5 @@
 
 PROJECTS=$(dirname "$0")/../..
 
-go get -v github.com/sagernet/sing@$(git -C $PROJECTS/sing rev-parse HEAD)
+go get -x github.com/sagernet/sing@$(git -C $PROJECTS/sing rev-parse HEAD)
 go mod tidy
diff --git a/go.mod b/go.mod
index 7f759f3..a7ef22c 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/sagernet/sing-shadowsocks
 go 1.18
 
 require (
-	github.com/sagernet/sing v0.0.0-20220530023925-d634f5f8d1f9
+	github.com/sagernet/sing v0.0.0-20220530041323-c82c144a8e00
 	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e
 	lukechampine.com/blake3 v1.1.7
 )
diff --git a/go.sum b/go.sum
index c38cf22..f3ed1db 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,8 @@
 github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/klauspost/cpuid/v2 v2.0.12 h1:p9dKCg8i4gmOxtv35DvrYoWqYzQrvEVdjQ762Y0OqZE=
 github.com/klauspost/cpuid/v2 v2.0.12/go.mod h1:g2LTdtYhdyuGPqyWyv7qRAmj1WBqxuObKfj5c0PQa7c=
-github.com/sagernet/sing v0.0.0-20220530023925-d634f5f8d1f9 h1:KqmiPU4dmM5bXsWF3i321bhdaY0iw9aSk9lHnKFqcA8=
-github.com/sagernet/sing v0.0.0-20220530023925-d634f5f8d1f9/go.mod h1:w2HnJzXKHpD6F5Z/9XlSD4qbcpHY2RSZuQnFzqgELMg=
+github.com/sagernet/sing v0.0.0-20220530041323-c82c144a8e00 h1:kQCITv1yBrSSL6RIBPWTe1+goyWLbS4DELWTeRKmoh8=
+github.com/sagernet/sing v0.0.0-20220530041323-c82c144a8e00/go.mod h1:w2HnJzXKHpD6F5Z/9XlSD4qbcpHY2RSZuQnFzqgELMg=
 golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e h1:T8NU3HyQ8ClP4SEE+KbFlg6n0NhuTsN4MyznaarGsZM=
 golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a h1:dGzPydgVsqGcTRVwiLJ1jVbufYwmzD3LfVPLKsKg+0k=
diff --git a/none.go b/none.go
index 6177e7f..9c25317 100644
--- a/none.go
+++ b/none.go
@@ -187,6 +187,9 @@ func (s *NoneService) NewConnection(ctx context.Context, conn net.Conn, metadata
 	return s.handler.NewConnection(ctx, conn, metadata)
 }
 
+func (s *NoneService) WriteIsThreadUnsafe() {
+}
+
 func (s *NoneService) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata M.Metadata) error {
 	destination, err := M.SocksaddrSerializer.ReadAddrPort(buffer)
 	if err != nil {
diff --git a/shadowaead/service.go b/shadowaead/service.go
index b3e1ccf..6d5a1c5 100644
--- a/shadowaead/service.go
+++ b/shadowaead/service.go
@@ -189,6 +189,9 @@ func (c *serverConn) Upstream() any {
 	return c.Conn
 }
 
+func (s *Service) WriteIsThreadUnsafe() {
+}
+
 func (s *Service) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata M.Metadata) error {
 	err := s.newPacket(ctx, conn, buffer, metadata)
 	if err != nil {
diff --git a/shadowaead_2022/relay.go b/shadowaead_2022/relay.go
index c1c5ec4..cb65018 100644
--- a/shadowaead_2022/relay.go
+++ b/shadowaead_2022/relay.go
@@ -175,6 +175,9 @@ func (s *Relay[U]) newConnection(ctx context.Context, conn net.Conn, metadata M.
 	return s.handler.NewConnection(ctx, conn, metadata)
 }
 
+func (s *Relay[U]) WriteIsThreadUnsafe() {
+}
+
 func (s *Relay[U]) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata M.Metadata) error {
 	err := s.newPacket(ctx, conn, buffer, metadata)
 	if err != nil {
diff --git a/shadowaead_2022/service.go b/shadowaead_2022/service.go
index d255bc5..1823541 100644
--- a/shadowaead_2022/service.go
+++ b/shadowaead_2022/service.go
@@ -306,6 +306,9 @@ func (c *serverConn) Upstream() any {
 	return c.Conn
 }
 
+func (s *Service) WriteIsThreadUnsafe() {
+}
+
 func (s *Service) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata M.Metadata) error {
 	err := s.newPacket(ctx, conn, buffer, metadata)
 	if err != nil {
@@ -489,21 +492,21 @@ func (s *serverUDPSession) nextPacketId() uint64 {
 	return atomic.AddUint64(&s.packetId, 1)
 }
 
-func (m *Service) newUDPSession() *serverUDPSession {
+func (s *Service) newUDPSession() *serverUDPSession {
 	session := &serverUDPSession{}
-	if m.udpCipher != nil {
+	if s.udpCipher != nil {
 		session.rng = Blake3KeyedHash(rand.Reader)
 		common.Must(binary.Read(session.rng, binary.BigEndian, &session.sessionId))
 	} else {
 		common.Must(binary.Read(rand.Reader, binary.BigEndian, &session.sessionId))
 	}
 	session.packetId--
-	if m.udpCipher == nil {
+	if s.udpCipher == nil {
 		sessionId := make([]byte, 8)
 		binary.BigEndian.PutUint64(sessionId, session.sessionId)
-		key := SessionKey(m.psk, sessionId, m.keySaltLength)
+		key := SessionKey(s.psk, sessionId, s.keySaltLength)
 		var err error
-		session.cipher, err = m.constructor(common.Dup(key))
+		session.cipher, err = s.constructor(common.Dup(key))
 		common.Must(err)
 		common.KeepAlive(key)
 	}
diff --git a/shadowaead_2022/service_multi.go b/shadowaead_2022/service_multi.go
index a4dec1f..54f6e38 100644
--- a/shadowaead_2022/service_multi.go
+++ b/shadowaead_2022/service_multi.go
@@ -235,6 +235,9 @@ func (s *MultiService[U]) newConnection(ctx context.Context, conn net.Conn, meta
 	}, metadata)
 }
 
+func (s *MultiService[U]) WriteIsThreadUnsafe() {
+}
+
 func (s *MultiService[U]) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata M.Metadata) error {
 	err := s.newPacket(ctx, conn, buffer, metadata)
 	if err != nil {