diff --git a/go.mod b/go.mod
index 547b2dc..b0c13b1 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,6 @@
 
 require (
 	github.com/VividCortex/ewma v1.1.1
-	golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67
-	golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a // indirect
+	golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2
+	golang.org/x/sys v0.0.0-20190219203350-90b0e4468f99 // indirect
 )
diff --git a/go.sum b/go.sum
index 015a109..5c1570c 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 v0.0.0-20190211182817-74369b46fc67 h1:ng3VDlRp5/DHpSWl02R4rM9I+8M2rhmsuLwAMmkLQWE=
-golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+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=