diff --git a/0-examples/voice/go.mod b/0-examples/voice/go.mod
index 453957c..d9cde8b 100644
--- a/0-examples/voice/go.mod
+++ b/0-examples/voice/go.mod
@@ -14,6 +14,6 @@ require (
 	github.com/gorilla/schema v1.2.0 // indirect
 	github.com/gorilla/websocket v1.4.2 // indirect
 	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
-	golang.org/x/sys v0.0.0-20211001092434-39dca1131b70 // indirect
+	golang.org/x/sys v0.1.0 // indirect
 	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac // indirect
 )
diff --git a/0-examples/voice/go.sum b/0-examples/voice/go.sum
index 7fcb949..5b6a53b 100644
--- a/0-examples/voice/go.sum
+++ b/0-examples/voice/go.sum
@@ -11,8 +11,9 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211001092434-39dca1131b70 h1:pGleJoyD1yA5HfvuaksHxD0404gsEkNDerKsQ0N0y1s=
 golang.org/x/sys v0.0.0-20211001092434-39dca1131b70/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+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/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac h1:7zkz7BUtwNFFqcowJ+RIgu2MaV/MapERkDIy+mwPyjs=