diff --git a/cmd/sing-box/cmd_tools_fetch_http3.go b/cmd/sing-box/cmd_tools_fetch_http3.go
index 3caa1e88..f87450b5 100644
--- a/cmd/sing-box/cmd_tools_fetch_http3.go
+++ b/cmd/sing-box/cmd_tools_fetch_http3.go
@@ -10,7 +10,6 @@ import (
 	"github.com/sagernet/quic-go"
 	"github.com/sagernet/quic-go/http3"
 	box "github.com/sagernet/sing-box"
-	"github.com/sagernet/sing/common/bufio"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 )
@@ -28,7 +27,16 @@ func initializeHTTP3Client(instance *box.Box) error {
 				if dErr != nil {
 					return nil, dErr
 				}
-				return quic.DialEarly(ctx, bufio.NewUnbindPacketConn(udpConn), udpConn.RemoteAddr(), tlsCfg, cfg)
+				quicConn, dErr := quic.DialEarlyConn(ctx, udpConn, tlsCfg, cfg)
+				if dErr != nil {
+					udpConn.Close()
+					return nil, dErr
+				}
+				go func() {
+					<-quicConn.Context().Done()
+					udpConn.Close()
+				}()
+				return quicConn, nil
 			},
 		},
 	}
diff --git a/common/httpclient/http3_transport.go b/common/httpclient/http3_transport.go
index d3eb5bc1..7b94560c 100644
--- a/common/httpclient/http3_transport.go
+++ b/common/httpclient/http3_transport.go
@@ -14,7 +14,6 @@ import (
 	"github.com/sagernet/quic-go/http3"
 	"github.com/sagernet/sing-box/common/tls"
 	"github.com/sagernet/sing-box/option"
-	"github.com/sagernet/sing/common/bufio"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
@@ -86,11 +85,15 @@ func newHTTP3RoundTripper(
 			if err != nil {
 				return nil, err
 			}
-			quicConn, err := quic.DialEarly(ctx, bufio.NewUnbindPacketConn(conn), conn.RemoteAddr(), tlsConfig, quicConfig)
+			quicConn, err := quic.DialEarlyConn(ctx, conn, tlsConfig, quicConfig)
 			if err != nil {
 				conn.Close()
 				return nil, err
 			}
+			go func() {
+				<-quicConn.Context().Done()
+				conn.Close()
+			}()
 			return quicConn, nil
 		},
 	}
diff --git a/common/networkquality/http3.go b/common/networkquality/http3.go
index 0e907821..61a109f2 100644
--- a/common/networkquality/http3.go
+++ b/common/networkquality/http3.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/sagernet/quic-go"
 	"github.com/sagernet/quic-go/http3"
+	qtls "github.com/sagernet/sing-quic"
 	sBufio "github.com/sagernet/sing/common/bufio"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
@@ -40,13 +41,17 @@ func NewHTTP3MeasurementClientFactory(dialer N.Dialer) (MeasurementClientFactory
 				wrappedConn := udpConn
 				if len(readCounters) > 0 || len(writeCounters) > 0 {
 					wrappedConn = sBufio.NewCounterConn(udpConn, readCounters, writeCounters)
+					qtls.SetDesiredBufferSizes(udpConn)
 				}
-				packetConn := sBufio.NewUnbindPacketConn(wrappedConn)
-				quicConn, dialErr := quic.DialEarly(ctx, packetConn, udpConn.RemoteAddr(), tlsCfg, cfg)
+				quicConn, dialErr := quic.DialEarlyConn(ctx, wrappedConn, tlsCfg, cfg)
 				if dialErr != nil {
 					udpConn.Close()
 					return nil, dialErr
 				}
+				go func() {
+					<-quicConn.Context().Done()
+					udpConn.Close()
+				}()
 				return quicConn, nil
 			},
 		}
diff --git a/dns/transport/quic/http3.go b/dns/transport/quic/http3.go
index 3a6c3fc1..ca7d49d0 100644
--- a/dns/transport/quic/http3.go
+++ b/dns/transport/quic/http3.go
@@ -22,7 +22,6 @@ import (
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/buf"
-	"github.com/sagernet/sing/common/bufio"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
@@ -121,7 +120,7 @@ func (t *HTTP3Transport) newTransport() *http3.Transport {
 			if dialErr != nil {
 				return nil, dialErr
 			}
-			quicConn, dialErr := quic.DialEarly(ctx, bufio.NewUnbindPacketConn(conn), conn.RemoteAddr(), tlsCfg, cfg)
+			quicConn, dialErr := quic.DialEarlyConn(ctx, conn, tlsCfg, cfg)
 			if dialErr != nil {
 				conn.Close()
 				return nil, dialErr
diff --git a/dns/transport/quic/quic.go b/dns/transport/quic/quic.go
index dc2e22fc..0b641bb3 100644
--- a/dns/transport/quic/quic.go
+++ b/dns/transport/quic/quic.go
@@ -17,7 +17,6 @@ import (
 	"github.com/sagernet/sing-box/option"
 	sQUIC "github.com/sagernet/sing-quic"
 	"github.com/sagernet/sing/common"
-	"github.com/sagernet/sing/common/bufio"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
@@ -109,8 +108,7 @@ func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg,
 			}
 			earlyConnection, err := sQUIC.DialEarly(
 				ctx,
-				bufio.NewUnbindPacketConn(rawConn),
-				t.serverAddr.UDPAddr(),
+				rawConn,
 				t.tlsConfig,
 				nil,
 			)
diff --git a/go.mod b/go.mod
index 41cfb502..fdd4e3bb 100644
--- a/go.mod
+++ b/go.mod
@@ -43,13 +43,13 @@ require (
 	github.com/sagernet/gvisor v0.0.0-20260727.0-sing-box-mod.1
 	github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a
 	github.com/sagernet/nftables v0.3.0-mod.4
-	github.com/sagernet/quic-go v0.61.0-sing-box-mod.1
+	github.com/sagernet/quic-go v0.61.0-sing-box-mod.1.0.20260806031718-a7bffd4a4f4b
 	github.com/sagernet/sing v0.9.0-beta.3
 	github.com/sagernet/sing-cloudflared v0.1.3-0.20260706062323-d9787e794aa3
 	github.com/sagernet/sing-mux v0.3.5
 	github.com/sagernet/sing-openconnect v0.0.0-20260722140139-e0c977659ca2
 	github.com/sagernet/sing-openvpn v0.0.0-20260729104525-103eb5fe5eb6
-	github.com/sagernet/sing-quic v0.6.4
+	github.com/sagernet/sing-quic v0.6.5-0.20260806031751-735cc76896e2
 	github.com/sagernet/sing-shadowsocks v0.2.8
 	github.com/sagernet/sing-shadowsocks2 v0.2.1
 	github.com/sagernet/sing-shadowtls v0.2.1
diff --git a/go.sum b/go.sum
index 66e4fc7e..25246763 100644
--- a/go.sum
+++ b/go.sum
@@ -314,8 +314,8 @@ github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a h1:ObwtHN2VpqE0ZN
 github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a/go.mod h1:xLnfdiJbSp8rNqYEdIW/6eDO4mVoogml14Bh2hSiFpM=
 github.com/sagernet/nftables v0.3.0-mod.4 h1:vnOtcDYeSXv2e5RoRuGH0lrpttQFJ8iC4ICS2nhlDSo=
 github.com/sagernet/nftables v0.3.0-mod.4/go.mod h1:8kslHG4VvYNihcco+i6uxIX7qbT8A56T0y5q7U44ZaQ=
-github.com/sagernet/quic-go v0.61.0-sing-box-mod.1 h1:ER31GLdh9u/06s1NmZ7zAL4hQK2bUlT4UInFdlikORE=
-github.com/sagernet/quic-go v0.61.0-sing-box-mod.1/go.mod h1:hmLC8GJPp+BrpBgrgJnacvI4fZGIhasuy1ROJJ8GR4E=
+github.com/sagernet/quic-go v0.61.0-sing-box-mod.1.0.20260806031718-a7bffd4a4f4b h1:MqirCxiM6A2RWKZIdmoMjtBdhp3q4z3GYdcEgmycO0o=
+github.com/sagernet/quic-go v0.61.0-sing-box-mod.1.0.20260806031718-a7bffd4a4f4b/go.mod h1:hmLC8GJPp+BrpBgrgJnacvI4fZGIhasuy1ROJJ8GR4E=
 github.com/sagernet/sing v0.9.0-beta.3 h1:DH9B94S82daJyJHz2oeirLwa/zh03AJ3xiXLJrM95Fo=
 github.com/sagernet/sing v0.9.0-beta.3/go.mod h1:K3Owt3xPhHugvlnlPPxZJ/exXdaJfEPOTNorGk4AXjo=
 github.com/sagernet/sing-cloudflared v0.1.3-0.20260706062323-d9787e794aa3 h1:3y6++yIa8XlDhxPkpR4p+7RUHVY2KTP9CPIGnWmOlO8=
@@ -326,8 +326,8 @@ github.com/sagernet/sing-openconnect v0.0.0-20260722140139-e0c977659ca2 h1:IOzb7
 github.com/sagernet/sing-openconnect v0.0.0-20260722140139-e0c977659ca2/go.mod h1:4AKZLVcvY3r54UaK2Gbnm7aN8pOwdLz+y4EP0QFZ5Eg=
 github.com/sagernet/sing-openvpn v0.0.0-20260729104525-103eb5fe5eb6 h1:ZAvhkor0prJ8KEX9EmTEH+gJ1WlA3ffjS8GZT6KKq9c=
 github.com/sagernet/sing-openvpn v0.0.0-20260729104525-103eb5fe5eb6/go.mod h1:PWX7WygD8jpwfqfaGNySXpJYTn0SOwjBI1BKHHC2+Bw=
-github.com/sagernet/sing-quic v0.6.4 h1:BmGPebxcVICOkyBkn8a+fAfAB41zU9i83SMzObiu9bo=
-github.com/sagernet/sing-quic v0.6.4/go.mod h1:+1lz5Rdw0+kAxRoJ9FW5RIott5OOAlS3QXKkwN6hR64=
+github.com/sagernet/sing-quic v0.6.5-0.20260806031751-735cc76896e2 h1:TFSDcPU6iHPuC+PhHgDyPunC2m0pqo0VQzWXpOQuCCk=
+github.com/sagernet/sing-quic v0.6.5-0.20260806031751-735cc76896e2/go.mod h1:Zg65Tkn/cHzVG/s0vDUcf3HTEQsRBtVVji9DWWNgF60=
 github.com/sagernet/sing-shadowsocks v0.2.8 h1:PURj5PRoAkqeHh2ZW205RWzN9E9RtKCVCzByXruQWfE=
 github.com/sagernet/sing-shadowsocks v0.2.8/go.mod h1:lo7TWEMDcN5/h5B8S0ew+r78ZODn6SwVaFhvB6H+PTI=
 github.com/sagernet/sing-shadowsocks2 v0.2.1 h1:dWV9OXCeFPuYGHb6IRqlSptVnSzOelnqqs2gQ2/Qioo=
diff --git a/transport/v2rayquic/client.go b/transport/v2rayquic/client.go
index c4e0b102..4e70e818 100644
--- a/transport/v2rayquic/client.go
+++ b/transport/v2rayquic/client.go
@@ -15,7 +15,6 @@ import (
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-quic"
 	"github.com/sagernet/sing/common"
-	"github.com/sagernet/sing/common/bufio"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 )
@@ -72,17 +71,16 @@ func (c *Client) offerNew() (*quic.Conn, error) {
 	if err != nil {
 		return nil, err
 	}
-	packetConn := bufio.NewUnbindPacketConn(udpConn)
-	quicConn, err := qtls.Dial(c.ctx, packetConn, udpConn.RemoteAddr(), c.tlsConfig, c.quicConfig)
+	quicConn, err := qtls.Dial(c.ctx, udpConn, c.tlsConfig, c.quicConfig)
 	if err != nil {
-		packetConn.Close()
+		udpConn.Close()
 		return nil, err
 	}
-	// quic-go does not take ownership of the packet conn passed to Dial:
+	// quic-go does not take ownership of the conn passed to Dial:
 	// when the connection ends it only stops reading.
 	go func() {
 		<-quicConn.Context().Done()
-		packetConn.Close()
+		udpConn.Close()
 	}()
 	c.conn.Store(quicConn)
 	c.rawConn = udpConn