diff --git a/go.mod b/go.mod
index c9a42bc..9bff08c 100644
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,7 @@ require (
 	github.com/syndtr/goleveldb v1.0.0
 	golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734
 	golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09 // indirect
-	golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be // indirect
+	golang.org/x/sys v0.1.0 // indirect
 	golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 	gopkg.in/yaml.v2 v2.2.2 // indirect
diff --git a/go.sum b/go.sum
index ee4b375..ef15357 100644
--- a/go.sum
+++ b/go.sum
@@ -62,6 +62,8 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be h1:mI+jhqkn68ybP0ORJqunXn+fq+Eeb4hHKqLQcFICjAc=
 golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be/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 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db h1:6/JqlYfC1CCaLnGceQTI+sDGhC9UBSPAsBqI0Gun6kU=