diff --git a/vendor/github.com/google/certificate-transparency/go/x509/x509.go b/vendor/github.com/google/certificate-transparency/go/x509/x509.go
index cda7220..62e472d 100755
--- a/vendor/github.com/google/certificate-transparency/go/x509/x509.go
+++ b/vendor/github.com/google/certificate-transparency/go/x509/x509.go
@@ -338,8 +338,6 @@ var (

 func namedCurveFromOID(oid asn1.ObjectIdentifier) elliptic.Curve {
        switch {
-       case oid.Equal(oidNamedCurveP224):
-               return elliptic.P224()
        case oid.Equal(oidNamedCurveP256):
                return elliptic.P256()
        case oid.Equal(oidNamedCurveP384):
@@ -352,8 +350,6 @@ func namedCurveFromOID(oid asn1.ObjectIdentifier) elliptic.Curve {

 func oidFromNamedCurve(curve elliptic.Curve) (asn1.ObjectIdentifier, bool) {
        switch curve {
-       case elliptic.P224():
-               return oidNamedCurveP224, true
        case elliptic.P256():
                return oidNamedCurveP256, true
        case elliptic.P384():
@@ -1458,7 +1454,7 @@ func CreateCertificate(rand io.Reader, template, parent *Certificate, pub interf
                hashFunc = crypto.SHA1
        case *ecdsa.PrivateKey:
                switch priv.Curve {
-               case elliptic.P224(), elliptic.P256():
+               case elliptic.P256():
                        hashFunc = crypto.SHA256
                        signatureAlgorithm.Algorithm = oidSignatureECDSAWithSHA256
                case elliptic.P384():