diff --git a/go.mod b/go.mod
index 85620f3..ece779e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,6 @@
 
 require (
 	github.com/VividCortex/ewma v1.1.1
-	golang.org/x/crypto v0.0.0-20190225124518-7f87c0fbb88b
-	golang.org/x/sys v0.0.0-20190225065934-cc5685c2db12 // indirect
+	golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25
+	golang.org/x/sys v0.0.0-20190307162637-572b51eaf722 // indirect
 )
diff --git a/go.sum b/go.sum
index 2a4ac41..c728fe7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,7 @@
 github.com/VividCortex/ewma v1.1.1 h1:MnEK4VOv6n0RSY4vtRe3h11qjxL3+t0B8yOL8iMXdcM=
 github.com/VividCortex/ewma v1.1.1/go.mod h1:2Tkkvm3sRDVXaiyucHiACn4cqf7DpdyLvmxzcbUokwA=
-golang.org/x/crypto v0.0.0-20190225124518-7f87c0fbb88b h1:+/WWzjwW6gidDJnMKWLKLX1gxn7irUTF1fLpQovfQ5M=
-golang.org/x/crypto v0.0.0-20190225124518-7f87c0fbb88b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20190225065934-cc5685c2db12 h1:Zw7eRv6INHGfu15LVRN1vrrwusJbnfJjAZn3D1VkQIE=
-golang.org/x/sys v0.0.0-20190225065934-cc5685c2db12/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25 h1:jsG6UpNLt9iAsb0S2AGW28DveNzzgmbXR+ENoPjUeIU=
+golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190307162637-572b51eaf722 h1:LSRNeQHux7ghsicM4qcfeKMS/jqCsp0fqd4Y2UJL6eA=
+golang.org/x/sys v0.0.0-20190307162637-572b51eaf722/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=