diff --git a/crypto/verificationhelper/ecdhkeys.go b/crypto/verificationhelper/ecdhkeys.go
index 3298ecca..91da9b78 100644
--- a/crypto/verificationhelper/ecdhkeys.go
+++ b/crypto/verificationhelper/ecdhkeys.go
@@ -18,7 +18,7 @@ func (e *ECDHPrivateKey) UnmarshalJSON(data []byte) (err error) {
 	if err != nil {
 		return
 	}
-	e.PrivateKey, err = ecdh.P256().NewPrivateKey(raw)
+	e.PrivateKey, err = ecdh.X25519().NewPrivateKey(raw)
 	return err
 }
 
@@ -39,7 +39,7 @@ func (e *ECDHPublicKey) UnmarshalJSON(data []byte) (err error) {
 	if err != nil {
 		return
 	}
-	e.PublicKey, err = ecdh.P256().NewPublicKey(raw)
+	e.PublicKey, err = ecdh.X25519().NewPublicKey(raw)
 	return
 }
 
diff --git a/crypto/verificationhelper/ecdhkeys_test.go b/crypto/verificationhelper/ecdhkeys_test.go
index 8414725f..109fbf88 100644
--- a/crypto/verificationhelper/ecdhkeys_test.go
+++ b/crypto/verificationhelper/ecdhkeys_test.go
@@ -13,7 +13,7 @@ import (
 )
 
 func TestECDHPrivateKey(t *testing.T) {
-	pk, err := ecdh.P256().GenerateKey(rand.Reader)
+	pk, err := ecdh.X25519().GenerateKey(rand.Reader)
 	require.NoError(t, err)
 	private := verificationhelper.ECDHPrivateKey{pk}
 	marshalled, err := json.Marshal(private)
@@ -29,7 +29,7 @@ func TestECDHPrivateKey(t *testing.T) {
 }
 
 func TestECDHPublicKey(t *testing.T) {
-	private, err := ecdh.P256().GenerateKey(rand.Reader)
+	private, err := ecdh.X25519().GenerateKey(rand.Reader)
 	require.NoError(t, err)
 
 	public := private.PublicKey()
@@ -38,7 +38,7 @@ func TestECDHPublicKey(t *testing.T) {
 	marshalled, err := json.Marshal(pub)
 	require.NoError(t, err)
 
-	assert.Len(t, marshalled, 90)
+	assert.Len(t, marshalled, 46)
 
 	var unmarshalled verificationhelper.ECDHPublicKey
 	err = json.Unmarshal(marshalled, &unmarshalled)