diff --git a/go.mod b/go.mod
index 31e7cd2..433dbbe 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/mccanne/charm
 require (
 	github.com/kr/text v0.1.0
 	golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc
-	golang.org/x/sys v0.0.0-20191010194322-b09406accb47 // indirect
+	golang.org/x/sys v0.1.0 // indirect
 )
 
 go 1.13
diff --git a/go.sum b/go.sum
index 20dfe50..17b30d8 100644
--- a/go.sum
+++ b/go.sum
@@ -3,5 +3,5 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc h1:F5tKCVGp+MUAHhKp5MZtGqAlGX3+oCsiL1Q629FL90M=
 golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20191010194322-b09406accb47 h1:/XfQ9z7ib8eEJX2hdgFTZJ/ntt0swNk5oYBziWeTCvY=
-golang.org/x/sys v0.0.0-20191010194322-b09406accb47/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=