diff --git a/lib/X509/Certificate/TBSCertificate.php b/lib/X509/Certificate/TBSCertificate.php
index 1b2d48b..93e1bbb 100644
--- a/lib/X509/Certificate/TBSCertificate.php
+++ b/lib/X509/Certificate/TBSCertificate.php
@@ -12,7 +12,7 @@
 use Sop\CryptoBridge\Crypto;
 use Sop\CryptoTypes\AlgorithmIdentifier\AlgorithmIdentifier;
 use Sop\CryptoTypes\AlgorithmIdentifier\Feature\SignatureAlgorithmIdentifier;
-use Sop\CryptoTypes\Asymmetric\PrivateKeyInfo;
+use Sop\CryptoTypes\Asymmetric\OneAsymmetricKey;
 use Sop\CryptoTypes\Asymmetric\PublicKeyInfo;
 use Sop\X501\ASN1\Name;
 use Sop\X509\Certificate\Extension\AuthorityKeyIdentifierExtension;
@@ -524,11 +524,11 @@ public function toASN1(): Sequence
      * Create signed certificate.
      *
      * @param SignatureAlgorithmIdentifier $algo         Algorithm used for signing
-     * @param PrivateKeyInfo               $privkey_info Private key used for signing
+     * @param OneAsymmetricKey             $privkey_info Private key used for signing
      * @param null|Crypto                  $crypto       Crypto engine, use default if not set
      */
     public function sign(SignatureAlgorithmIdentifier $algo,
-        PrivateKeyInfo $privkey_info, ?Crypto $crypto = null): Certificate
+        OneAsymmetricKey $privkey_info, ?Crypto $crypto = null): Certificate
     {
         $crypto = $crypto ?? Crypto::getDefault();
         $tbs_cert = clone $this;