diff --git a/crypto.go b/crypto.go
index 2cb886f..c33bbca 100644
--- a/crypto.go
+++ b/crypto.go
@@ -18,8 +18,8 @@ import (
 	_ "crypto/sha256"
 	_ "crypto/sha512"
 
-	"git.schwanenlied.me/yawning/x448.git"
 	"github.com/cloudflare/circl/dh/sidh"
+	"github.com/cloudflare/circl/dh/x448"
 	"golang.org/x/crypto/chacha20poly1305"
 	"golang.org/x/crypto/curve25519"
 )
@@ -464,17 +464,17 @@ func (s x25519Scheme) PrivateKeySize() int {
 // ECDH with X448
 
 type x448PrivateKey struct {
-	val [56]byte
+	val x448.Key
 }
 
 func (priv x448PrivateKey) PublicKey() KEMPublicKey {
 	pub := &x448PublicKey{}
-	x448.ScalarBaseMult(&pub.val, &priv.val)
+	x448.KeyGen(&pub.val, &priv.val)
 	return pub
 }
 
 type x448PublicKey struct {
-	val [56]byte
+	val x448.Key
 }
 
 type x448Scheme struct {
@@ -552,8 +552,8 @@ func (s x448Scheme) DH(priv KEMPrivateKey, pub KEMPublicKey) ([]byte, error) {
 		return nil, fmt.Errorf("Public key not suitable for X448: %+v", pub)
 	}
 
-	var sharedSecret, zero [56]byte
-	x448.ScalarMult(&sharedSecret, &xPriv.val, &xPub.val)
+	var sharedSecret, zero x448.Key
+	x448.Shared(&sharedSecret, &xPriv.val, &xPub.val)
 	if subtle.ConstantTimeCompare(sharedSecret[:], zero[:]) == 1 {
 		return nil, fmt.Errorf("bad input point: low order point")
 	}
diff --git a/go.mod b/go.mod
index 6879bd5..77315f9 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,6 @@ module github.com/cisco/go-hpke
 go 1.14
 
 require (
-	git.schwanenlied.me/yawning/x448.git v0.0.0-20170617130356-01b048fb03d6
 	github.com/cisco/go-tls-syntax v0.0.0-20200617162716-46b0cfb76b9b
 	github.com/cloudflare/circl v1.0.0
 	github.com/stretchr/testify v1.6.1
diff --git a/go.sum b/go.sum
index 6a1b6e4..5ed3863 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,3 @@
-git.schwanenlied.me/yawning/x448.git v0.0.0-20170617130356-01b048fb03d6 h1:w8IZgCntCe0RuBJp+dENSMwEBl/k8saTgJ5hPca5IWw=
-git.schwanenlied.me/yawning/x448.git v0.0.0-20170617130356-01b048fb03d6/go.mod h1:wQaGCqEu44ykB17jZHCevrgSVl3KJnwQBObUtrKU4uU=
 github.com/cisco/go-tls-syntax v0.0.0-20200617162716-46b0cfb76b9b h1:Ves2turKTX7zruivAcUOQg155xggcbv3suVdbKCBQNM=
 github.com/cisco/go-tls-syntax v0.0.0-20200617162716-46b0cfb76b9b/go.mod h1:0AZAV7lYvynZQ5ErHlGMKH+4QYMyNCFd+AiL9MlrCYA=
 github.com/cloudflare/circl v1.0.0 h1:64b6pyfCFbYm623ncIkYGNZaOcmIbyd+CjyMi2L9vdI=