diff --git a/go.mod b/go.mod
index b0cfc7c..f564bae 100644
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,7 @@ require (
 	github.com/refraction-networking/utls v1.5.3
 	github.com/smartystreets/goconvey v1.8.1
 	github.com/stretchr/testify v1.8.4
-	github.com/xtaci/kcp-go/v5 v5.6.3
+	github.com/xtaci/kcp-go/v5 v5.6.5
 	github.com/xtaci/smux v1.5.24
 	gitlab.torproject.org/tpo/anti-censorship/geoip v0.0.0-20210928150955-7ce4b3d98d01
 	gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/goptlib v1.5.0
diff --git a/go.sum b/go.sum
index 3a190ab..899e626 100644
--- a/go.sum
+++ b/go.sum
@@ -177,8 +177,8 @@ github.com/templexxx/xorsimd v0.4.2 h1:ocZZ+Nvu65LGHmCLZ7OoCtg8Fx8jnHKK37SjvngUo
 github.com/templexxx/xorsimd v0.4.2/go.mod h1:HgwaPoDREdi6OnULpSfxhzaiiSUY4Fi3JPn1wpt28NI=
 github.com/tjfoc/gmsm v1.4.1 h1:aMe1GlZb+0bLjn+cKTPEvvn9oUEBlJitaZiiBwsbgho=
 github.com/tjfoc/gmsm v1.4.1/go.mod h1:j4INPkHWMrhJb38G+J6W4Tw0AbuN8Thu3PbdVYhVcTE=
-github.com/xtaci/kcp-go/v5 v5.6.3 h1:yd59SKXdJ0PBxeMBy3apalxFCEmBLGgQmL6nP46tU0g=
-github.com/xtaci/kcp-go/v5 v5.6.3/go.mod h1:uIuw2KEg3FcmEdS4PeXHaGty9Ui7NYb1WKIrSDwpMg4=
+github.com/xtaci/kcp-go/v5 v5.6.5 h1:oxGZNobj3OddrLzwdJYnR/waNgwrL98u02u0DWNHE3k=
+github.com/xtaci/kcp-go/v5 v5.6.5/go.mod h1:Qy3Zf2tWTdFdEs0E8JvhrX+39r5UDZoYac8anvud7/Q=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae h1:J0GxkO96kL4WF+AIT3M4mfUVinOCPgf2uUWYFUzN0sM=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae/go.mod h1:gXtu8J62kEgmN++bm9BVICuT/e8yiLI2KFobd/TRFsE=
 github.com/xtaci/smux v1.5.24 h1:77emW9dtnOxxOQ5ltR+8BbsX1kzcOxQ5gB+aaV9hXOY=