diff --git a/gmssl-examples/gmsm-tls-and-tlcp/go.mod b/gmssl-examples/gmsm-tls-and-tlcp/go.mod
index 22b1f18f..f28e44df 100644
--- a/gmssl-examples/gmsm-tls-and-tlcp/go.mod
+++ b/gmssl-examples/gmsm-tls-and-tlcp/go.mod
@@ -6,5 +6,5 @@ require github.com/tjfoc/gmsm v1.4.1
 
 require (
 	golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee // indirect
-	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
+	golang.org/x/sys v0.1.0 // indirect
 )
diff --git a/gmssl-examples/gmsm-tls-and-tlcp/go.sum b/gmssl-examples/gmsm-tls-and-tlcp/go.sum
index 2c2cf10d..1c47cbf2 100644
--- a/gmssl-examples/gmsm-tls-and-tlcp/go.sum
+++ b/gmssl-examples/gmsm-tls-and-tlcp/go.sum
@@ -45,8 +45,9 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=