diff --git a/go.mod b/go.mod
index ece779e..0bb516f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,5 @@
 
 require (
 	github.com/VividCortex/ewma v1.1.1
-	golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25
-	golang.org/x/sys v0.0.0-20190307162637-572b51eaf722 // indirect
+	golang.org/x/crypto v0.0.0-20190403202508-8e1b8d32e692
 )
diff --git a/go.sum b/go.sum
index c728fe7..5976173 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +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 v0.0.0-20190228161510-8dd112bcdc25 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=
+golang.org/x/crypto v0.0.0-20190403202508-8e1b8d32e692 h1:GRhHqDOgeDr6QDTtq9gn2O4iKvm5dsbfqD/TXb0KLX0=
+golang.org/x/crypto v0.0.0-20190403202508-8e1b8d32e692/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
+golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e h1:nFYrTHrdrAOpShe27kaFHjsqYSEQ0KWqdWLu3xuZJts=
+golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=