diff --git a/composer.json b/composer.json
index 0ef299d..6dc3772 100644
--- a/composer.json
+++ b/composer.json
@@ -25,12 +25,12 @@
     }
   },
   "require-dev": {
-    "phpunit/phpunit": "^6",
-    "vimeo/psalm": "^1|^2"
+    "phpunit/phpunit": "^8",
+    "vimeo/psalm": "^3"
   },
   "require": {
-    "php": "^7",
-    "zendframework/zend-mail": "^2.8",
+    "php": "^7.2",
+    "laminas/laminas-mail": "^2.8",
     "pear/crypt_gpg": "^1.6"
   }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 2f6c532..c08f857 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -9,13 +9,7 @@
          processIsolation="false"
          stopOnError="false"
          stopOnFailure="false"
-         syntaxCheck="true"
 >
-    <testsuites>
-        <testsuite name="Unit">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
     <testsuites>
         <testsuite name="GPGMailer Test Suite">
             <directory suffix="Test.php">./tests</directory>
diff --git a/src/GPGMailer.php b/src/GPGMailer.php
index ccc2d20..46b2001 100644
--- a/src/GPGMailer.php
+++ b/src/GPGMailer.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace ParagonIE\GPGMailer;
 
-use Zend\Mail\{
+use Laminas\Mail\{
     Message,
     Transport\TransportInterface
 };
@@ -70,7 +70,7 @@ public function export(string $fingerprint): string
             throw new GPGMailerException(
                 'Could not export fingerprint "' . $fingerprint . '": ' .
                     $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -97,7 +97,7 @@ public function decrypt(Message $message): Message
         } catch (\PEAR_Exception $ex) {
             throw new GPGMailerException(
                 'Could not decrypt message: ' . $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -127,7 +127,7 @@ public function encrypt(Message $message, string $fingerprint): Message
         } catch (\PEAR_Exception $ex) {
             throw new GPGMailerException(
                 'Could not encrypt message: ' . $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -161,7 +161,7 @@ public function encryptAndSign(Message $message, string $fingerprint): Message
         } catch (\PEAR_Exception $ex) {
             throw new GPGMailerException(
                 'Could not encrypt and sign message: ' . $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -195,7 +195,7 @@ public function import(string $gpgKey): string
         } catch (\PEAR_Exception $ex) {
             throw new GPGMailerException(
                 'Could not import public key: ' . $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -295,7 +295,7 @@ public function setOption(string $key, $value): self
         } catch (\PEAR_Exception $ex) {
             throw new GPGMailerException(
                 'Could not set option "' . $key . '": ' . $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -356,7 +356,7 @@ public function sign(Message $message): Message
         } catch (\PEAR_Exception $ex) {
             throw new GPGMailerException(
                 'Could not sign message: ' . $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
@@ -396,7 +396,7 @@ public function verify(Message $message, string $fingerprint): bool
             throw new GPGMailerException(
                 'An error occurred trying to verify this message: ' .
                     $ex->getMessage(),
-                $ex->getCode(),
+                (int) $ex->getCode(),
                 $ex
             );
         }
diff --git a/tests/GPGMailerTest.php b/tests/GPGMailerTest.php
index 2b55b45..e40e32b 100644
--- a/tests/GPGMailerTest.php
+++ b/tests/GPGMailerTest.php
@@ -1,6 +1,6 @@
 <?php
 
-use Zend\Mail\Transport\File;
+use Laminas\Mail\Transport\File;
 use ParagonIE\GPGMailer\GPGMailer;
 use ParagonIE\GPGMailer\GPGMailerException;
 use PHPUnit\Framework\TestCase;
@@ -18,7 +18,7 @@ class GPGMailerTest extends TestCase
     /**
      * @throws GPGMailerException
      */
-    public function setUp()
+    public function setUp(): void
     {
         if (\is_dir(__DIR__ . '/test/')) {
             \rmdir(__DIR__ . '/test/');
@@ -39,6 +39,9 @@ public function testSetOption()
         $this->assertTrue($gm->getOption('invalid key'));
 
         \mkdir(__DIR__ . '/test/', 0400);
+        if (is_writable(__DIR__ . '/test/')) {
+            $this->markTestSkipped('Inside virtualbox shared folder.');
+        }
         try {
             $gm->setOption('homedir', __DIR__ . '/test/');
             $this->fail('No exception thrown');