diff --git a/go.mod b/go.mod
index afb8111..6bd7261 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 v0.0.0-20220630130201-63a57e6e1286
+	github.com/sagernet/sing v0.0.0-20220701010008-eb347e80a46f
 	golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d
 	lukechampine.com/blake3 v1.1.7
 )
diff --git a/go.sum b/go.sum
index 70bd601..54a62e6 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 v0.0.0-20220630130201-63a57e6e1286 h1:KQQvqXMEs5V1mUNeH+PrNWpXxJaaWCo+njCaeEgLUR0=
-github.com/sagernet/sing v0.0.0-20220630130201-63a57e6e1286/go.mod h1:3ZmoGNg/nNJTyHAZFNRSPaXpNIwpDvyIiAUd0KIWV5c=
+github.com/sagernet/sing v0.0.0-20220701010008-eb347e80a46f h1:kmtWNwUjAnILpyNPJjdp9+9bcq4IA9hmBbEBLb3L6R8=
+github.com/sagernet/sing v0.0.0-20220701010008-eb347e80a46f/go.mod h1:3ZmoGNg/nNJTyHAZFNRSPaXpNIwpDvyIiAUd0KIWV5c=
 golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d h1:sK3txAijHtOK88l68nt020reeT1ZdKLIYetKl95FzVY=
 golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/sys v0.0.0-20220627191245-f75cf1eec38b h1:2n253B2r0pYSmEV+UNCQoPfU/FiaizQEK5Gu4Bq4JE8=
diff --git a/shadowsocks.go b/shadowsocks.go
index cd6893e..7f9c642 100644
--- a/shadowsocks.go
+++ b/shadowsocks.go
@@ -41,6 +41,10 @@ type UserContext[U comparable] struct {
 	User U
 }
 
+func (c *UserContext[U]) Upstream() any {
+	return c.Context
+}
+
 type ServerConnError struct {
 	net.Conn
 	Source M.Socksaddr