diff --git a/go.mod b/go.mod
index 858bea96..173824a9 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	github.com/urfave/cli v1.22.16
 	github.com/xtaci/kcp-go/v5 v5.6.18
 	github.com/xtaci/qpp v1.1.18
-	github.com/xtaci/smux v1.5.32
+	github.com/xtaci/smux v1.5.33
 	github.com/xtaci/tcpraw v1.2.31
 	golang.org/x/crypto v0.31.0
 )
diff --git a/go.sum b/go.sum
index 52bcf4ff..d8e48683 100644
--- a/go.sum
+++ b/go.sum
@@ -76,6 +76,8 @@ github.com/xtaci/qpp v1.1.18 h1:FyULigD8/msXdxj9AjOFQg3/Z/tGz4574n21shZ6SZo=
 github.com/xtaci/qpp v1.1.18/go.mod h1:DI0dcoZ+qu4ze5C0hkt8grLfTVqBiZ3hXTimGyg5TTI=
 github.com/xtaci/smux v1.5.32 h1:IDdOaJDf8jk5NHKlTw05ge+0rdMjnXg3cwHkss5Pbcw=
 github.com/xtaci/smux v1.5.32/go.mod h1:OMlQbT5vcgl2gb49mFkYo6SMf+zP3rcjcwQz7ZU7IGY=
+github.com/xtaci/smux v1.5.33 h1:xosoZt0AUZdIXEB6z09kt1bge+l1L8wzMtJdPB6GAPI=
+github.com/xtaci/smux v1.5.33/go.mod h1:OMlQbT5vcgl2gb49mFkYo6SMf+zP3rcjcwQz7ZU7IGY=
 github.com/xtaci/tcpraw v1.2.31 h1:i9mXzejnGJdGi0DpVKUn19Hq202/sHOJt0kObEwuE/U=
 github.com/xtaci/tcpraw v1.2.31/go.mod h1:T1blYD2EDkLneb+HtxddnzX38SoC9BG537EhkXeaT2k=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
diff --git a/vendor/github.com/xtaci/smux/session.go b/vendor/github.com/xtaci/smux/session.go
index 19806be0..36540e60 100644
--- a/vendor/github.com/xtaci/smux/session.go
+++ b/vendor/github.com/xtaci/smux/session.go
@@ -348,12 +348,15 @@ func (s *Session) RemoteAddr() net.Addr {
 // notify the session that a stream has closed
 func (s *Session) streamClosed(sid uint32) {
 	s.streamLock.Lock()
-	if n := s.streams[sid].recycleTokens(); n > 0 { // return remaining tokens to the bucket
-		if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
-			s.notifyBucket()
+	if stream, ok := s.streams[sid]; ok {
+		n := stream.recycleTokens()
+		if n > 0 { // return remaining tokens to the bucket
+			if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
+				s.notifyBucket()
+			}
 		}
+		delete(s.streams, sid)
 	}
-	delete(s.streams, sid)
 	s.streamLock.Unlock()
 }
 
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 5ec73a46..a170579c 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -50,7 +50,7 @@ github.com/xtaci/kcp-go/v5
 # github.com/xtaci/qpp v1.1.18
 ## explicit; go 1.22.3
 github.com/xtaci/qpp
-# github.com/xtaci/smux v1.5.32
+# github.com/xtaci/smux v1.5.33
 ## explicit; go 1.13
 github.com/xtaci/smux
 # github.com/xtaci/tcpraw v1.2.31