diff --git a/go.mod b/go.mod
index 0af2dad..19efe04 100644
--- a/go.mod
+++ b/go.mod
@@ -17,5 +17,5 @@ require (
 	github.com/multiformats/go-multibase v0.0.1 // indirect
 	github.com/multiformats/go-multihash v0.0.1 // indirect
 	golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67 // indirect
-	golang.org/x/sys v0.0.0-20190219092855-153ac476189d // indirect
+	golang.org/x/sys v0.1.0 // indirect
 )
diff --git a/go.sum b/go.sum
index b86b4b6..0572b16 100644
--- a/go.sum
+++ b/go.sum
@@ -25,5 +25,6 @@ github.com/multiformats/go-multihash v0.0.1 h1:HHwN1K12I+XllBCrqKnhX949Orn4oawPk
 github.com/multiformats/go-multihash v0.0.1/go.mod h1:w/5tugSrLEbWqlcgJabL3oHFKTwfvkofsjW2Qa1ct4U=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67 h1:ng3VDlRp5/DHpSWl02R4rM9I+8M2rhmsuLwAMmkLQWE=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20190219092855-153ac476189d h1:Z0Ahzd7HltpJtjAHHxX8QFP3j1yYgiuvjbjRzDj/KH0=
 golang.org/x/sys v0.0.0-20190219092855-153ac476189d/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=