diff --git a/dns/transport/quic/http3.go b/dns/transport/quic/http3.go
index c3a5ca81..0a93e515 100644
--- a/dns/transport/quic/http3.go
+++ b/dns/transport/quic/http3.go
@@ -126,6 +126,12 @@ func (t *HTTP3Transport) newTransport() *http3.Transport {
 				conn.Close()
 				return nil, dialErr
 			}
+			// quic-go does not take ownership of the packet conn passed to
+			// DialEarly: when the connection ends it only stops reading.
+			go func() {
+				<-quicConn.Context().Done()
+				conn.Close()
+			}()
 			return quicConn, nil
 		},
 		TLSClientConfig: t.tlsConfig,
diff --git a/dns/transport/quic/quic.go b/dns/transport/quic/quic.go
index 3bb93e41..8d45bd82 100644
--- a/dns/transport/quic/quic.go
+++ b/dns/transport/quic/quic.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"os"
+	"time"
 
 	"github.com/sagernet/quic-go"
 	"github.com/sagernet/sing-box/adapter"
@@ -117,6 +118,12 @@ func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg,
 				rawConn.Close()
 				return nil, E.Cause(err, "establish QUIC connection")
 			}
+			// quic-go does not take ownership of the packet conn passed to
+			// DialEarly: when the connection ends it only stops reading.
+			go func() {
+				<-earlyConnection.Context().Done()
+				rawConn.Close()
+			}()
 			return earlyConnection, nil
 		})
 		if err != nil {
@@ -144,6 +151,11 @@ func (t *Transport) exchange(ctx context.Context, message *mDNS.Msg, conn *quic.
 		return nil, E.Cause(err, "open stream")
 	}
 	defer stream.CancelRead(0)
+	stopWatch := context.AfterFunc(ctx, func() {
+		stream.CancelRead(0)
+		_ = stream.SetWriteDeadline(time.Now())
+	})
+	defer stopWatch()
 	err = transport.WriteMessage(stream, 0, message)
 	if err != nil {
 		stream.Close()
diff --git a/go.mod b/go.mod
index 2af986fb..372c8186 100644
--- a/go.mod
+++ b/go.mod
@@ -35,7 +35,7 @@ require (
 	github.com/sagernet/quic-go v0.59.0-sing-box-mod.4
 	github.com/sagernet/sing v0.8.11
 	github.com/sagernet/sing-mux v0.3.5
-	github.com/sagernet/sing-quic v0.6.1
+	github.com/sagernet/sing-quic v0.6.3
 	github.com/sagernet/sing-shadowsocks v0.2.8
 	github.com/sagernet/sing-shadowsocks2 v0.2.1
 	github.com/sagernet/sing-shadowtls v0.2.1-0.20250503051639-fcd445d33c11
diff --git a/go.sum b/go.sum
index 86eca25b..8a0aa268 100644
--- a/go.sum
+++ b/go.sum
@@ -240,8 +240,8 @@ github.com/sagernet/sing v0.8.11 h1:AKZRvjFPHtAXwGCjOJrzAQPiZxr8mobhuSUqkHf+VQw=
 github.com/sagernet/sing v0.8.11/go.mod h1:olXxWQNqRW/l2Q6JI3b2Qmz8iQnIFlOeeH8bx6JhgUA=
 github.com/sagernet/sing-mux v0.3.5 h1:RHnhVEc+SFqkrK4xMygYjDwwLhzp2Bj3lztSukONfhI=
 github.com/sagernet/sing-mux v0.3.5/go.mod h1:QvlKMyNBNrQoyX4x+gq028uPbLM2XeRpWtDsWBJbFSk=
-github.com/sagernet/sing-quic v0.6.1 h1:lx0tcm99wIA1RkyvILNzRSsMy1k7TTQYIhx71E/WBlw=
-github.com/sagernet/sing-quic v0.6.1/go.mod h1:K5bWvITOm4vE10fwLfrWpw27bCoVJ+tfQ79tOWg+Ko8=
+github.com/sagernet/sing-quic v0.6.3 h1:0wSPqCNJsC7CadB5GZS1aPkyU27aRwHPd5SlsijbBNw=
+github.com/sagernet/sing-quic v0.6.3/go.mod h1:K5bWvITOm4vE10fwLfrWpw27bCoVJ+tfQ79tOWg+Ko8=
 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 3e0d8b81..c4e0b102 100644
--- a/transport/v2rayquic/client.go
+++ b/transport/v2rayquic/client.go
@@ -78,6 +78,12 @@ func (c *Client) offerNew() (*quic.Conn, error) {
 		packetConn.Close()
 		return nil, err
 	}
+	// quic-go does not take ownership of the packet conn passed to Dial:
+	// when the connection ends it only stops reading.
+	go func() {
+		<-quicConn.Context().Done()
+		packetConn.Close()
+	}()
 	c.conn.Store(quicConn)
 	c.rawConn = udpConn
 	return quicConn, nil
diff --git a/transport/v2rayquic/stream.go b/transport/v2rayquic/stream.go
index aad62afb..411c57a4 100644
--- a/transport/v2rayquic/stream.go
+++ b/transport/v2rayquic/stream.go
@@ -2,6 +2,7 @@ package v2rayquic
 
 import (
 	"net"
+	"time"
 
 	"github.com/sagernet/quic-go"
 	qtls "github.com/sagernet/sing-quic"
@@ -37,5 +38,8 @@ func (s *StreamWrapper) Upstream() any {
 func (s *StreamWrapper) Close() error {
 	s.CancelRead(0)
 	s.Stream.Close()
+	// quic-go's Stream.Close does not unblock a Write blocked on flow control,
+	// but a past write deadline does; buffered data and the FIN are unaffected.
+	s.Stream.SetWriteDeadline(time.Now())
 	return nil
 }