diff --git a/adapter/outbound/hysteria2.go b/adapter/outbound/hysteria2.go
index 8963da66..46e052e6 100644
--- a/adapter/outbound/hysteria2.go
+++ b/adapter/outbound/hysteria2.go
@@ -54,6 +54,7 @@ type Hysteria2Option struct {
 	ALPN           []string `proxy:"alpn,omitempty"`
 	CustomCA       string   `proxy:"ca,omitempty"`
 	CustomCAString string   `proxy:"ca-str,omitempty"`
+	CWND           int      `proxy:"cwnd,omitempty"`
 }
 
 type hy2SingDialer struct {
@@ -191,6 +192,7 @@ func NewHysteria2(option Hysteria2Option) (*Hysteria2, error) {
 		Password:           option.Password,
 		TLSConfig:          tlsConfig,
 		UDPDisabled:        false,
+		CWND:               option.CWND,
 	}
 
 	client, err := hysteria2.NewClient(clientOptions)
diff --git a/go.mod b/go.mod
index d16ccb01..487fe4c5 100644
--- a/go.mod
+++ b/go.mod
@@ -20,7 +20,7 @@ require (
 	github.com/mdlayher/netlink v1.7.2
 	github.com/metacubex/gopacket v1.1.20-0.20230608035415-7e2f98a3e759
 	github.com/metacubex/quic-go v0.38.1-0.20230909013832-033f6a2115cf
-	github.com/metacubex/sing-quic v0.0.0-20230921015854-1ed89eed54d5
+	github.com/metacubex/sing-quic v0.0.0-20230921083613-f4d3299bca83
 	github.com/metacubex/sing-shadowsocks v0.2.5
 	github.com/metacubex/sing-shadowsocks2 v0.1.4
 	github.com/metacubex/sing-tun v0.1.12
diff --git a/go.sum b/go.sum
index 45cb3cbb..5386ec0d 100644
--- a/go.sum
+++ b/go.sum
@@ -99,8 +99,8 @@ github.com/metacubex/quic-go v0.38.1-0.20230909013832-033f6a2115cf h1:hflzPbb2M+
 github.com/metacubex/quic-go v0.38.1-0.20230909013832-033f6a2115cf/go.mod h1:7RCcKJJk1DMeNQQNnYKS+7FqftqPfG031oP8jrYRMw8=
 github.com/metacubex/sing v0.0.0-20230921005553-6eacdd2c7a24 h1:652uMd78eKMU7/sVkW8qqAdZkJaiDoUflfCs5LHvb0Q=
 github.com/metacubex/sing v0.0.0-20230921005553-6eacdd2c7a24/go.mod h1:GQ673iPfUnkbK/dIPkfd1Xh1MjOGo36gkl/mkiHY7Jg=
-github.com/metacubex/sing-quic v0.0.0-20230921015854-1ed89eed54d5 h1:XhWilr6vJoXy4n/sP2datek28FTF3s3rWHhezdFFD8s=
-github.com/metacubex/sing-quic v0.0.0-20230921015854-1ed89eed54d5/go.mod h1:oGpQmqe5tj3sPdPWCNLbBoUSwqd+Z6SqVO7TlMNVnH4=
+github.com/metacubex/sing-quic v0.0.0-20230921083613-f4d3299bca83 h1:xk2Uob4xSGCYRuo+UsDParhi1cam6G+11wrwGd6EvhM=
+github.com/metacubex/sing-quic v0.0.0-20230921083613-f4d3299bca83/go.mod h1:oGpQmqe5tj3sPdPWCNLbBoUSwqd+Z6SqVO7TlMNVnH4=
 github.com/metacubex/sing-shadowsocks v0.2.5 h1:O2RRSHlKGEpAVG/OHJQxyHqDy8uvvdCW/oW2TDBOIhc=
 github.com/metacubex/sing-shadowsocks v0.2.5/go.mod h1:Xz2uW9BEYGEoA8B4XEpoxt7ERHClFCwsMAvWaruoyMo=
 github.com/metacubex/sing-shadowsocks2 v0.1.4 h1:OOCf8lgsVcpTOJUeaFAMzyKVebaQOBnKirDdUdBoKIE=
diff --git a/listener/config/hysteria2.go b/listener/config/hysteria2.go
index e8e9c09c..5520babc 100644
--- a/listener/config/hysteria2.go
+++ b/listener/config/hysteria2.go
@@ -16,6 +16,7 @@ type Hysteria2Server struct {
 	Down                  string            `yaml:"down" json:"down,omitempty"`
 	IgnoreClientBandwidth bool              `yaml:"ignore-client-bandwidth" json:"ignore-client-bandwidth,omitempty"`
 	Masquerade            string            `yaml:"masquerade" json:"masquerade,omitempty"`
+	CWND                  int               `yaml:"cwnd" json:"cwnd,omitempty"`
 }
 
 func (h Hysteria2Server) String() string {
diff --git a/listener/inbound/hysteria2.go b/listener/inbound/hysteria2.go
index 00feadb1..430d0e68 100644
--- a/listener/inbound/hysteria2.go
+++ b/listener/inbound/hysteria2.go
@@ -20,6 +20,7 @@ type Hysteria2Option struct {
 	Down                  string            `inbound:"down,omitempty"`
 	IgnoreClientBandwidth bool              `inbound:"ignore-client-bandwidth,omitempty"`
 	Masquerade            string            `inbound:"masquerade,omitempty"`
+	CWND                  int               `inbound:"cwnd,omitempty"`
 }
 
 func (o Hysteria2Option) Equal(config C.InboundConfig) bool {
@@ -55,6 +56,7 @@ func NewHysteria2(options *Hysteria2Option) (*Hysteria2, error) {
 			Down:                  options.Down,
 			IgnoreClientBandwidth: options.IgnoreClientBandwidth,
 			Masquerade:            options.Masquerade,
+			CWND:                  options.CWND,
 		},
 	}, nil
 }
diff --git a/listener/sing_hysteria2/server.go b/listener/sing_hysteria2/server.go
index 1d6ab29a..4e0a7c07 100644
--- a/listener/sing_hysteria2/server.go
+++ b/listener/sing_hysteria2/server.go
@@ -111,6 +111,7 @@ func New(config LC.Hysteria2Server, tcpIn chan<- C.ConnContext, udpIn chan<- C.P
 		IgnoreClientBandwidth: config.IgnoreClientBandwidth,
 		Handler:               h,
 		MasqueradeHandler:     masqueradeHandler,
+		CWND:                  config.CWND,
 	})
 	if err != nil {
 		return nil, err
diff --git a/transport/tuic/common/congestion.go b/transport/tuic/common/congestion.go
index 8b8018b5..36ee01a1 100644
--- a/transport/tuic/common/congestion.go
+++ b/transport/tuic/common/congestion.go
@@ -13,7 +13,9 @@ const (
 )
 
 func SetCongestionController(quicConn quic.Connection, cc string, cwnd int) {
-	CWND := c.ByteCount(cwnd)
+	if cwnd == 0 {
+		cwnd = 32
+	}
 	switch cc {
 	case "cubic":
 		quicConn.SetCongestionControl(
@@ -38,7 +40,7 @@ func SetCongestionController(quicConn quic.Connection, cc string, cwnd int) {
 			congestion.NewBBRSender(
 				congestion.DefaultClock{},
 				congestion.GetInitialPacketSize(quicConn.RemoteAddr()),
-				CWND*congestion.InitialMaxDatagramSize,
+				c.ByteCount(cwnd)*congestion.InitialMaxDatagramSize,
 				congestion.DefaultBBRMaxCongestionWindow*congestion.InitialMaxDatagramSize,
 			),
 		)