diff --git a/tool/go.mod b/tool/go.mod
index e2bc929..20dfd41 100644
--- a/tool/go.mod
+++ b/tool/go.mod
@@ -4,5 +4,5 @@ go 1.13
 
 require (
 	github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07
-	golang.org/x/sys v0.0.0-20191210023423-ac6580df4449 // indirect
+	golang.org/x/sys v0.1.0 // indirect
 )
diff --git a/tool/go.sum b/tool/go.sum
index 21bd614..291306b 100644
--- a/tool/go.sum
+++ b/tool/go.sum
@@ -1,4 +1,4 @@
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07 h1:UyzmZLoiDWMRywV4DUYb9Fbt8uiOSooupjTq10vpvnU=
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=
-golang.org/x/sys v0.0.0-20191210023423-ac6580df4449 h1:gSbV7h1NRL2G1xTg/owz62CST1oJBmxy4QpMMregXVQ=
-golang.org/x/sys v0.0.0-20191210023423-ac6580df4449/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=