diff --git a/common/dialer/conntrack/packet_conn.go b/common/dialer/conntrack/packet_conn.go
index 3ae3f39d..6e2d925b 100644
--- a/common/dialer/conntrack/packet_conn.go
+++ b/common/dialer/conntrack/packet_conn.go
@@ -4,6 +4,7 @@ import (
 	"io"
 	"net"
 
+	"github.com/sagernet/sing/common/bufio"
 	"github.com/sagernet/sing/common/x/list"
 )
 
@@ -42,7 +43,7 @@ func (c *PacketConn) Close() error {
 }
 
 func (c *PacketConn) Upstream() any {
-	return c.PacketConn
+	return bufio.NewPacketConn(c.PacketConn)
 }
 
 func (c *PacketConn) ReaderReplaceable() bool {
diff --git a/go.mod b/go.mod
index 9d960954..2cddbfce 100644
--- a/go.mod
+++ b/go.mod
@@ -24,7 +24,7 @@ require (
 	github.com/sagernet/gomobile v0.0.0-20230413023804-244d7ff07035
 	github.com/sagernet/quic-go v0.0.0-20230202071646-a8c8afb18b32
 	github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691
-	github.com/sagernet/sing v0.2.5-0.20230425211221-a23ffbaeb5b9
+	github.com/sagernet/sing v0.2.5-0.20230427151730-ed2d05ab518a
 	github.com/sagernet/sing-dns v0.1.5-0.20230426113254-25d948c44223
 	github.com/sagernet/sing-mux v0.0.0-20230425130511-b0a6ffd8406f
 	github.com/sagernet/sing-shadowsocks v0.2.2-0.20230417102954-f77257340507
diff --git a/go.sum b/go.sum
index 7b6651c1..7f2ab351 100644
--- a/go.sum
+++ b/go.sum
@@ -111,8 +111,8 @@ github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691 h1:5Th31OC6yj8byL
 github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691/go.mod h1:B8lp4WkQ1PwNnrVMM6KyuFR20pU8jYBD+A4EhJovEXU=
 github.com/sagernet/sing v0.0.0-20220817130738-ce854cda8522/go.mod h1:QVsS5L/ZA2Q5UhQwLrn0Trw+msNd/NPGEhBKR/ioWiY=
 github.com/sagernet/sing v0.1.8/go.mod h1:jt1w2u7lJQFFSGLiRrRIs5YWmx4kAPfWuOejuDW9qMk=
-github.com/sagernet/sing v0.2.5-0.20230425211221-a23ffbaeb5b9 h1:kpgKJbhesj6BBLTKIfBCJGQPm2ww7pNxn566C6TrHdA=
-github.com/sagernet/sing v0.2.5-0.20230425211221-a23ffbaeb5b9/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
+github.com/sagernet/sing v0.2.5-0.20230427151730-ed2d05ab518a h1:qQ4fG1XrlTbLvtkJK5SbtIGJ4cIjObvVjL1AvhD+vrI=
+github.com/sagernet/sing v0.2.5-0.20230427151730-ed2d05ab518a/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
 github.com/sagernet/sing-dns v0.1.5-0.20230426113254-25d948c44223 h1:L4eMuM07iSHY3UCknFnuFuHoe5clZuF2Xnf2wwA6Lwc=
 github.com/sagernet/sing-dns v0.1.5-0.20230426113254-25d948c44223/go.mod h1:ZKuuqgsHRxDahYrzgSgy4vIAGGuKPlIf4hLcNzYzLkY=
 github.com/sagernet/sing-mux v0.0.0-20230425130511-b0a6ffd8406f h1:iEpOTgBTjt0vZJVXMTqYq13XyIu/337TWbq6WZ3CMWc=