diff --git a/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php b/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
index f05eee9d..ea6c6c6c 100644
--- a/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
@@ -629,8 +629,10 @@ abstract class PKCS8 extends PKCS
 
     /**
      * Perform some preliminary parsing of the key
+     *
+     * @param string|array $key
      */
-    private static function preParse(string &$key): array
+    private static function preParse(&$key): array
     {
         self::initialize_static_variables();
 
diff --git a/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php b/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
index ac0d31cc..d8cc31d3 100644
--- a/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
@@ -23,7 +23,6 @@ namespace phpseclib3\Crypt\DH\Formats\Keys;
 
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
 use phpseclib3\Exception\RuntimeException;
-use phpseclib3\Exception\UnexpectedValueException;
 use phpseclib3\File\ASN1;
 use phpseclib3\File\ASN1\Maps;
 use phpseclib3\Math\BigInteger;
diff --git a/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php b/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
index 7045ca19..c5a0e037 100644
--- a/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
@@ -27,7 +27,6 @@ namespace phpseclib3\Crypt\DSA\Formats\Keys;
 
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
 use phpseclib3\Exception\RuntimeException;
-use phpseclib3\Exception\UnexpectedValueException;
 use phpseclib3\File\ASN1;
 use phpseclib3\File\ASN1\Maps;
 use phpseclib3\Math\BigInteger;
diff --git a/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php b/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
index 421c98c8..e6322ed9 100644
--- a/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
@@ -32,7 +32,6 @@ use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
 use phpseclib3\Crypt\EC\Curves\Ed25519;
 use phpseclib3\Crypt\EC\Curves\Ed448;
 use phpseclib3\Exception\RuntimeException;
-use phpseclib3\Exception\UnexpectedValueException;
 use phpseclib3\Exception\UnsupportedCurveException;
 use phpseclib3\File\ASN1;
 use phpseclib3\File\ASN1\Maps;
diff --git a/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php b/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
index d8d1b8d1..78a776a9 100644
--- a/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
@@ -28,7 +28,6 @@ declare(strict_types=1);
 namespace phpseclib3\Crypt\RSA\Formats\Keys;
 
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
-use phpseclib3\Exception\UnexpectedValueException;
 use phpseclib3\File\ASN1;
 use phpseclib3\Math\BigInteger;
 
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 7d68a949..2b58f5a2 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -2376,8 +2376,6 @@ class SSH2
 
     /**
      * Return the currently configured timeout
-     *
-     * @return int
      */
     public function getTimeout(): int
     {
diff --git a/tests/Unit/Crypt/EC/KeyTest.php b/tests/Unit/Crypt/EC/KeyTest.php
index 53ed68ec..8028b3d6 100644
--- a/tests/Unit/Crypt/EC/KeyTest.php
+++ b/tests/Unit/Crypt/EC/KeyTest.php
@@ -674,7 +674,7 @@ MIIEDwIBADATBgcqhkjOPQIBBggqhkjOPQMBBwSCA/MwggPvAgEBBIID6P//////
         $this->assertTrue($key->verify($plaintext, $sig));
     }
 
-    public function testNakedPKCS8PubKey()
+    public function testNakedPKCS8PubKey(): void
     {
         $key = 'MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAErPJyxEu2/oKCrJaaTVTrq39DKJ2XcN6W+k8UvGf+Y/lDWNbFitQocabsDUvSN0edHH3UKP5QPTz4cOlyIPMrXQ==';
         $key = PublicKeyLoader::load($key);