diff --git a/go.mod b/go.mod
index b0c13b1..23eab8a 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,6 @@
 
 require (
 	github.com/VividCortex/ewma v1.1.1
-	golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2
-	golang.org/x/sys v0.0.0-20190219203350-90b0e4468f99 // indirect
+	golang.org/x/crypto v0.0.0-20190222235706-ffb98f73852f
+	golang.org/x/sys v0.0.0-20190222171317-cd391775e71e // indirect
 )
diff --git a/go.sum b/go.sum
index 5c1570c..6706347 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,6 @@
 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 v0.0.0-20190219172222-a4c6cb3142f2 h1:NwxKRvbkH5MsNkvOtPZi3/3kmI8CAzs3mtv+GLQMkNo=
-golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20190219203350-90b0e4468f99 h1:mlL4HvR5ojTCLdWRydhoj7jto5SXLsxLc0b1r/3DNlE=
-golang.org/x/sys v0.0.0-20190219203350-90b0e4468f99/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/crypto v0.0.0-20190222235706-ffb98f73852f h1:qWFY9ZxP3tfI37wYIs/MnIAqK0vlXp1xnYEa5HxFSSY=
+golang.org/x/crypto v0.0.0-20190222235706-ffb98f73852f/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/sys v0.0.0-20190222171317-cd391775e71e h1:oF7qaQxUH6KzFdKN4ww7NpPdo53SZi4UlcksLrb2y/o=
+golang.org/x/sys v0.0.0-20190222171317-cd391775e71e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=