diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 9bbc248..063463c 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -12,42 +12,26 @@ jobs:
     strategy:
       matrix:
         php: [8.1, 8.0, 7.4, 7.3, 7.2]
-        laravel: [8.*, 7.*, 6.*, 5.8.*, 5.7.*, 5.6.*]
+        laravel: [9.*, 8.*, 7.*, 6.*]
         os: [ubuntu-latest]
         include:
+          - laravel: 9.*
+            testbench: 7.*
           - laravel: 8.*
             testbench: 6.*
           - laravel: 7.*
             testbench: 5.*
           - laravel: 6.*
             testbench: 4.*
-          - laravel: 5.8.*
-            testbench: 3.8.*
-          - laravel: 5.7.*
-            testbench: 3.7.*
-          - laravel: 5.6.*
-            testbench: 3.6.*
         exclude:
-          - laravel: 8.*
+          - laravel: 9.*
             php: 7.2
-          - laravel: 5.7.*
-            php: 7.4
-          - laravel: 5.6.*
+          - laravel: 9.*
+            php: 7.3
+          - laravel: 9.*
             php: 7.4
-          - laravel: 5.5.*
-            php: 7.4
-          - laravel: 5.8.*
-            php: 8.0
-          - laravel: 5.7.*
-            php: 8.0
-          - laravel: 5.6.*
-            php: 8.0
-          - laravel: 5.6.*
-            php: 8.1
-          - laravel: 5.7.*
-            php: 8.1
-          - laravel: 5.8.*
-            php: 8.1
+          - laravel: 8.*
+            php: 7.2
           - laravel: 6.*
             php: 8.1
           - laravel: 7.*
@@ -91,4 +75,4 @@ jobs:
           CI_DB_DATABASE: test
           CI_DB_USERNAME: root
           CI_DB_PASSWORD: root
-        run: vendor/bin/phpunit
\ No newline at end of file
+        run: vendor/bin/phpunit
diff --git a/README.md b/README.md
index edda785..457a323 100644
--- a/README.md
+++ b/README.md
@@ -19,18 +19,16 @@ We feel the package is currently feature complete, but feel free to send a pull
 
 # Requirements
 
-This package requires Laravel 5.6 or higher.
+This package requires Laravel 6.0 or higher.
 
 Please check the table below for supported Laravel and PHP versions:
 
 |Laravel Version| PHP Version |
 |---|---|
-| 5.6 | 7.2 or 7.3
-| 5.7 | 7.2 or 7.3
-| 5.8 | 7.2 or 7.3 or 7.4
 | 6.x | 7.2 or 7.3 or 7.4 or 8.0
 | 7.x | 7.2 or 7.3 or 7.4 or 8.0
 | 8.x | 7.3 or 7.4 or 8.0 or 8.1
+| 9.x | 8.0 or 8.1
 
 # Installation
 
diff --git a/composer.json b/composer.json
index 7430806..583fb0d 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,6 @@
     },
     "require-dev": {
         "mockery/mockery": "^1.2",
-        "orchestra/testbench": "^3.5 || ^3.6 || ^3.7 || ^3.8 || ^4.0 || ^5.0",
-        "symfony/console": "^4.4|^5.0"
+        "orchestra/testbench": "^3.5 || ^3.6 || ^3.7 || ^3.8 || ^4.0 || ^5.0"
     }
 }
diff --git a/src/Config.php b/src/Config.php
index ab5a16d..28640c4 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 class Config
@@ -9,7 +11,7 @@ class Config
      *
      * @return int
      */
-    public static function maxAttemptCount()
+    public static function maxAttemptCount(): int
     {
         return max(config('laravel-database-emails.attempts', 1), 3);
     }
@@ -19,7 +21,7 @@ public static function maxAttemptCount()
      *
      * @return bool
      */
-    public static function encryptEmails()
+    public static function encryptEmails(): bool
     {
         return config('laravel-database-emails.encrypt', false);
     }
@@ -29,7 +31,7 @@ public static function encryptEmails()
      *
      * @return bool
      */
-    public static function testing()
+    public static function testing(): bool
     {
         return (bool) config('laravel-database-emails.testing.enabled', false);
     }
@@ -39,7 +41,7 @@ public static function testing()
      *
      * @return string
      */
-    public static function testEmailAddress()
+    public static function testEmailAddress(): string
     {
         return config('laravel-database-emails.testing.email');
     }
@@ -49,7 +51,7 @@ public static function testEmailAddress()
      *
      * @return int
      */
-    public static function cronjobEmailLimit()
+    public static function cronjobEmailLimit(): int
     {
         return config('laravel-database-emails.limit', 20);
     }
@@ -59,7 +61,7 @@ public static function cronjobEmailLimit()
      *
      * @return bool
      */
-    public static function sendImmediately()
+    public static function sendImmediately(): bool
     {
         return (bool) config('laravel-database-emails.immediately', false);
     }
diff --git a/src/Email.php b/src/Email.php
index efb3952..4eba5ff 100644
--- a/src/Email.php
+++ b/src/Email.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Exception;
@@ -51,9 +53,9 @@ class Email extends Model
      *
      * @return EmailComposer
      */
-    public static function compose()
+    public static function compose(): EmailComposer
     {
-        return new EmailComposer(new static);
+        return new EmailComposer(new static());
     }
 
     /**
@@ -61,7 +63,7 @@ public static function compose()
      *
      * @return int
      */
-    public function getId()
+    public function getId(): int
     {
         return $this->id;
     }
@@ -71,7 +73,7 @@ public function getId()
      *
      * @return string|null
      */
-    public function getLabel()
+    public function getLabel(): ?string
     {
         return $this->label;
     }
@@ -79,7 +81,7 @@ public function getLabel()
     /**
      * Get the e-mail recipient.
      *
-     * @return string
+     * @return string|array
      */
     public function getRecipient()
     {
@@ -89,7 +91,7 @@ public function getRecipient()
     /**
      * Get the e-mail recipient.
      *
-     * @return string
+     * @return string|array
      */
     public function getRecipientAttribute()
     {
@@ -99,9 +101,9 @@ public function getRecipientAttribute()
     /**
      * Get the e-mail from.
      *
-     * @return string
+     * @return array|null
      */
-    public function getFrom()
+    public function getFrom(): ?array
     {
         return $this->from;
     }
@@ -109,9 +111,9 @@ public function getFrom()
     /**
      * Get the e-mail from.
      *
-     * @return string
+     * @return array|null
      */
-    public function getFromAttribute()
+    public function getFromAttribute(): ?array
     {
         return $this->from;
     }
@@ -121,7 +123,7 @@ public function getFromAttribute()
      *
      * @return string|null
      */
-    public function getFromAddress()
+    public function getFromAddress(): ?string
     {
         return $this->from['address'] ?? config('mail.from.address');
     }
@@ -131,7 +133,7 @@ public function getFromAddress()
      *
      * @return string|null
      */
-    public function getFromName()
+    public function getFromName(): ?string
     {
         return $this->from['name'] ?? config('mail.from.name');
     }
@@ -141,7 +143,7 @@ public function getFromName()
      *
      * @return string
      */
-    public function getRecipientsAsString()
+    public function getRecipientsAsString(): string
     {
         $glue = ', ';
 
@@ -161,7 +163,7 @@ public function getCc()
     /**
      * Get the e-mail CC addresses.
      *
-     * @return array
+     * @return array|string
      */
     public function getCcAttribute()
     {
@@ -181,7 +183,7 @@ public function getBcc()
     /**
      * Get the e-mail BCC addresses.
      *
-     * @return array
+     * @return array|string
      */
     public function getBccAttribute()
     {
@@ -193,7 +195,7 @@ public function getBccAttribute()
      *
      * @return string
      */
-    public function getSubject()
+    public function getSubject(): string
     {
         return $this->subject;
     }
@@ -203,7 +205,7 @@ public function getSubject()
      *
      * @return string
      */
-    public function getSubjectAttribute()
+    public function getSubjectAttribute(): string
     {
         return $this->subject;
     }
@@ -213,7 +215,7 @@ public function getSubjectAttribute()
      *
      * @return string
      */
-    public function getView()
+    public function getView(): string
     {
         return $this->view;
     }
@@ -221,9 +223,9 @@ public function getView()
     /**
      * Get the e-mail variables.
      *
-     * @return array
+     * @return array|null
      */
-    public function getVariables()
+    public function getVariables(): ?array
     {
         return $this->variables;
     }
@@ -231,9 +233,9 @@ public function getVariables()
     /**
      * Get the e-mail variables.
      *
-     * @return array
+     * @return array|null
      */
-    public function getVariablesAttribute()
+    public function getVariablesAttribute(): ?array
     {
         return $this->variables;
     }
@@ -243,7 +245,7 @@ public function getVariablesAttribute()
      *
      * @return string
      */
-    public function getBody()
+    public function getBody(): string
     {
         return $this->body;
     }
@@ -253,7 +255,7 @@ public function getBody()
      *
      * @return string
      */
-    public function getBodyAttribute()
+    public function getBodyAttribute(): string
     {
         return $this->body;
     }
@@ -263,7 +265,7 @@ public function getBodyAttribute()
      *
      * @return array
      */
-    public function getAttachments()
+    public function getAttachments(): array
     {
         return $this->attachments;
     }
@@ -273,7 +275,7 @@ public function getAttachments()
      *
      * @return int
      */
-    public function getAttempts()
+    public function getAttempts(): int
     {
         return $this->attempts;
     }
@@ -281,9 +283,9 @@ public function getAttempts()
     /**
      * Get the queued date.
      *
-     * @return mixed
+     * @return string|null
      */
-    public function getQueuedDate()
+    public function getQueuedDate(): ?string
     {
         return $this->queued_at;
     }
@@ -293,7 +295,7 @@ public function getQueuedDate()
      *
      * @return Carbon
      */
-    public function getQueuedDateAsCarbon()
+    public function getQueuedDateAsCarbon(): Carbon
     {
         if ($this->queued_at instanceof Carbon) {
             return $this->queued_at;
@@ -305,9 +307,9 @@ public function getQueuedDateAsCarbon()
     /**
      * Get the scheduled date.
      *
-     * @return mixed
+     * @return string|null
      */
-    public function getScheduledDate()
+    public function getScheduledDate(): ?string
     {
         return $this->scheduled_at;
     }
@@ -317,7 +319,7 @@ public function getScheduledDate()
      *
      * @return bool
      */
-    public function hasVariables()
+    public function hasVariables(): bool
     {
         return ! is_null($this->variables);
     }
@@ -327,7 +329,7 @@ public function hasVariables()
      *
      * @return Carbon
      */
-    public function getScheduledDateAsCarbon()
+    public function getScheduledDateAsCarbon(): Carbon
     {
         if ($this->scheduled_at instanceof Carbon) {
             return $this->scheduled_at;
@@ -339,9 +341,9 @@ public function getScheduledDateAsCarbon()
     /**
      * Get the send date for this e-mail.
      *
-     * @return string
+     * @return string|null
      */
-    public function getSendDate()
+    public function getSendDate(): ?string
     {
         return $this->sent_at;
     }
@@ -349,9 +351,9 @@ public function getSendDate()
     /**
      * Get the send error.
      *
-     * @return string
+     * @return string|string
      */
-    public function getError()
+    public function getError(): ?string
     {
         return $this->error;
     }
@@ -361,7 +363,7 @@ public function getError()
      *
      * @return bool
      */
-    public function hasFrom()
+    public function hasFrom(): bool
     {
         return is_array($this->from) && count($this->from) > 0;
     }
@@ -371,7 +373,7 @@ public function hasFrom()
      *
      * @return bool
      */
-    public function hasCc()
+    public function hasCc(): bool
     {
         return strlen($this->getRawDatabaseValue('cc')) > 0;
     }
@@ -381,7 +383,7 @@ public function hasCc()
      *
      * @return bool
      */
-    public function hasBcc()
+    public function hasBcc(): bool
     {
         return strlen($this->getRawDatabaseValue('bcc')) > 0;
     }
@@ -391,7 +393,7 @@ public function hasBcc()
      *
      * @return bool
      */
-    public function isScheduled()
+    public function isScheduled(): bool
     {
         return ! is_null($this->getScheduledDate());
     }
@@ -401,7 +403,7 @@ public function isScheduled()
      *
      * @return bool
      */
-    public function isEncrypted()
+    public function isEncrypted(): bool
     {
         return (bool) $this->getRawDatabaseValue('encrypted');
     }
@@ -411,7 +413,7 @@ public function isEncrypted()
      *
      * @return bool
      */
-    public function isSent()
+    public function isSent(): bool
     {
         return ! is_null($this->sent_at);
     }
@@ -421,7 +423,7 @@ public function isSent()
      *
      * @return bool
      */
-    public function hasFailed()
+    public function hasFailed(): bool
     {
         return $this->failed == 1;
     }
@@ -431,7 +433,7 @@ public function hasFailed()
      *
      * @return void
      */
-    public function markAsSending()
+    public function markAsSending(): void
     {
         $this->update([
             'attempts' => $this->attempts + 1,
@@ -444,7 +446,7 @@ public function markAsSending()
      *
      * @return void
      */
-    public function markAsSent()
+    public function markAsSent(): void
     {
         $now = Carbon::now()->toDateTimeString();
 
@@ -462,7 +464,7 @@ public function markAsSent()
      * @param Exception $exception
      * @return void
      */
-    public function markAsFailed(Exception $exception)
+    public function markAsFailed(Exception $exception): void
     {
         $this->update([
             'sending' => 0,
@@ -476,9 +478,9 @@ public function markAsFailed(Exception $exception)
      *
      * @return void
      */
-    public function send()
+    public function send(): void
     {
-        (new Sender)->send($this);
+        (new Sender())->send($this);
     }
 
     /**
@@ -486,7 +488,7 @@ public function send()
      *
      * @return void
      */
-    public function retry()
+    public function retry(): void
     {
         $retry = $this->replicate();
 
@@ -505,7 +507,12 @@ public function retry()
         $retry->save();
     }
 
-    public function getRawDatabaseValue($key = null, $default = null)
+    /**
+     * @param string $key
+     * @param mixed $default
+     * @return mixed
+     */
+    public function getRawDatabaseValue(string $key = null, $default = null)
     {
         if (method_exists($this, 'getRawOriginal')) {
             return $this->getRawOriginal($key, $default);
diff --git a/src/EmailComposer.php b/src/EmailComposer.php
index 31e3397..b358565 100644
--- a/src/EmailComposer.php
+++ b/src/EmailComposer.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Illuminate\Mail\Mailable;
@@ -35,7 +37,7 @@ public function __construct(Email $email)
      *
      * @return Email
      */
-    public function getEmail()
+    public function getEmail(): Email
     {
         return $this->email;
     }
@@ -45,9 +47,9 @@ public function getEmail()
      *
      * @param string $key
      * @param mixed  $value
-     * @return static
+     * @return self
      */
-    public function setData($key, $value)
+    public function setData(string $key, $value): self
     {
         $this->data[$key] = $value;
 
@@ -61,7 +63,7 @@ public function setData($key, $value)
      * @param mixed  $default
      * @return mixed
      */
-    public function getData($key, $default = null)
+    public function getData(string $key, $default = null)
     {
         if (! is_null($default) && ! $this->hasData($key)) {
             return $default;
@@ -76,7 +78,7 @@ public function getData($key, $default = null)
      * @param string $key
      * @return bool
      */
-    public function hasData($key)
+    public function hasData(string $key): bool
     {
         return isset($this->data[$key]);
     }
@@ -85,9 +87,9 @@ public function hasData($key)
      * Set the e-mail label.
      *
      * @param string $label
-     * @return static
+     * @return self
      */
-    public function label($label)
+    public function label(string $label): self
     {
         return $this->setData('label', $label);
     }
@@ -95,11 +97,11 @@ public function label($label)
     /**
      * Set the e-mail from address and aname.
      *
-     * @param array $address
-     * @param array $name
-     * @return static
+     * @param string|null $address
+     * @param string|null $name
+     * @return self
      */
-    public function from($address = null, $name = null)
+    public function from(?string $address = null, ?string $name = null): self
     {
         return $this->setData('from', compact('address', 'name'));
     }
@@ -108,9 +110,9 @@ public function from($address = null, $name = null)
      * Set the e-mail recipient(s).
      *
      * @param string|array $recipient
-     * @return static
+     * @return self
      */
-    public function recipient($recipient)
+    public function recipient($recipient): self
     {
         return $this->setData('recipient', $recipient);
     }
@@ -119,9 +121,9 @@ public function recipient($recipient)
      * Define the carbon-copy address(es).
      *
      * @param string|array $cc
-     * @return static
+     * @return self
      */
-    public function cc($cc)
+    public function cc($cc): self
     {
         return $this->setData('cc', $cc);
     }
@@ -130,9 +132,9 @@ public function cc($cc)
      * Define the blind carbon-copy address(es).
      *
      * @param string|array $bcc
-     * @return static
+     * @return self
      */
-    public function bcc($bcc)
+    public function bcc($bcc): self
     {
         return $this->setData('bcc', $bcc);
     }
@@ -141,9 +143,9 @@ public function bcc($bcc)
      * Set the e-mail subject.
      *
      * @param string $subject
-     * @return static
+     * @return self
      */
-    public function subject($subject)
+    public function subject(string $subject): self
     {
         return $this->setData('subject', $subject);
     }
@@ -152,9 +154,9 @@ public function subject($subject)
      * Set the e-mail view.
      *
      * @param string $view
-     * @return static
+     * @return self
      */
-    public function view($view)
+    public function view(string $view): self
     {
         return $this->setData('view', $view);
     }
@@ -163,9 +165,9 @@ public function view($view)
      * Set the e-mail variables.
      *
      * @param array $variables
-     * @return EmailComposer
+     * @return self
      */
-    public function variables($variables)
+    public function variables(array $variables): self
     {
         return $this->setData('variables', $variables);
     }
@@ -176,7 +178,7 @@ public function variables($variables)
      * @param mixed $scheduledAt
      * @return Email
      */
-    public function schedule($scheduledAt)
+    public function schedule($scheduledAt): Email
     {
         return $this->later($scheduledAt);
     }
@@ -187,7 +189,7 @@ public function schedule($scheduledAt)
      * @param mixed $scheduledAt
      * @return Email
      */
-    public function later($scheduledAt)
+    public function later($scheduledAt): Email
     {
         $this->setData('scheduled_at', $scheduledAt);
 
@@ -202,7 +204,7 @@ public function later($scheduledAt)
      * @param \DateTimeInterface|\DateInterval|int|null $delay
      * @return Email
      */
-    public function queue($connection = null, $queue = null, $delay = null)
+    public function queue(?string $connection = null, ?string $queue = null, $delay = null): Email
     {
         $connection = $connection ?: config('queue.default');
         $queue = $queue ?: 'default';
@@ -219,13 +221,13 @@ public function queue($connection = null, $queue = null, $delay = null)
      * Set the Mailable.
      *
      * @param Mailable $mailable
-     * @return static
+     * @return self
      */
-    public function mailable(Mailable $mailable)
+    public function mailable(Mailable $mailable): self
     {
         $this->setData('mailable', $mailable);
 
-        (new MailableReader)->read($this);
+        (new MailableReader())->read($this);
 
         return $this;
     }
@@ -235,16 +237,10 @@ public function mailable(Mailable $mailable)
      *
      * @param string $file
      * @param array  $options
-     * @return static
+     * @return self
      */
-    public function attach($file, $options = [])
+    public function attach(string $file, array $options = []): self
     {
-        $validFileName = (is_string($file) && strlen($file) > 0);
-
-        if (! $validFileName) {
-            return $this;
-        }
-
         $attachments = $this->hasData('attachments') ? $this->getData('attachments') : [];
 
         $attachments[] = compact('file', 'options');
@@ -258,16 +254,10 @@ public function attach($file, $options = [])
      * @param  string $data
      * @param  string $name
      * @param  array  $options
-     * @return $this
+     * @return self
      */
-    public function attachData($data, $name, array $options = [])
+    public function attachData(string $data, string $name, array $options = []): self
     {
-        $validData = (is_string($data) && strlen($data) > 0);
-
-        if (! $validData) {
-            return $this;
-        }
-
         $attachments = $this->hasData('rawAttachments') ? $this->getData('rawAttachments') : [];
 
         $attachments[] = compact('data', 'name', 'options');
@@ -280,14 +270,14 @@ public function attachData($data, $name, array $options = [])
      *
      * @return Email
      */
-    public function send()
+    public function send(): Email
     {
-        (new Validator)->validate($this);
+        (new Validator())->validate($this);
 
-        (new Preparer)->prepare($this);
+        (new Preparer())->prepare($this);
 
         if (Config::encryptEmails()) {
-            (new Encrypter)->encrypt($this);
+            (new Encrypter())->encrypt($this);
         }
 
         $this->email->save();
diff --git a/src/Encrypter.php b/src/Encrypter.php
index c0438a5..b61ef21 100644
--- a/src/Encrypter.php
+++ b/src/Encrypter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 class Encrypter
@@ -9,7 +11,7 @@ class Encrypter
      *
      * @param EmailComposer $composer
      */
-    public function encrypt(EmailComposer $composer)
+    public function encrypt(EmailComposer $composer): void
     {
         $this->setEncrypted($composer);
 
@@ -29,7 +31,7 @@ public function encrypt(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function setEncrypted(EmailComposer $composer)
+    private function setEncrypted(EmailComposer $composer): void
     {
         $composer->getEmail()->setAttribute('encrypted', 1);
     }
@@ -39,7 +41,7 @@ private function setEncrypted(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function encryptRecipients(EmailComposer $composer)
+    private function encryptRecipients(EmailComposer $composer): void
     {
         $email = $composer->getEmail();
 
@@ -55,7 +57,7 @@ private function encryptRecipients(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function encryptFrom(EmailComposer $composer)
+    private function encryptFrom(EmailComposer $composer): void
     {
         $email = $composer->getEmail();
 
@@ -69,7 +71,7 @@ private function encryptFrom(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function encryptSubject(EmailComposer $composer)
+    private function encryptSubject(EmailComposer $composer): void
     {
         $email = $composer->getEmail();
 
@@ -83,7 +85,7 @@ private function encryptSubject(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function encryptVariables(EmailComposer $composer)
+    private function encryptVariables(EmailComposer $composer): void
     {
         if (! $composer->hasData('variables')) {
             return;
@@ -101,7 +103,7 @@ private function encryptVariables(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function encryptBody(EmailComposer $composer)
+    private function encryptBody(EmailComposer $composer): void
     {
         $email = $composer->getEmail();
 
diff --git a/src/HasEncryptedAttributes.php b/src/HasEncryptedAttributes.php
index a73984d..bdc2ebf 100644
--- a/src/HasEncryptedAttributes.php
+++ b/src/HasEncryptedAttributes.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Illuminate\Contracts\Encryption\DecryptException;
diff --git a/src/LaravelDatabaseEmailsServiceProvider.php b/src/LaravelDatabaseEmailsServiceProvider.php
index 846fe9f..57e249b 100644
--- a/src/LaravelDatabaseEmailsServiceProvider.php
+++ b/src/LaravelDatabaseEmailsServiceProvider.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Illuminate\Support\ServiceProvider;
@@ -11,7 +13,7 @@ class LaravelDatabaseEmailsServiceProvider extends ServiceProvider
      *
      * @return void
      */
-    public function boot()
+    public function boot(): void
     {
         $this->bootConfig();
         $this->bootDatabase();
@@ -56,7 +58,7 @@ private function bootDatabase(): void
      *
      * @return void
      */
-    public function register()
+    public function register(): void
     {
         $this->commands([
             SendEmailsCommand::class,
diff --git a/src/MailableReader.php b/src/MailableReader.php
index 38c4872..f926540 100644
--- a/src/MailableReader.php
+++ b/src/MailableReader.php
@@ -1,9 +1,10 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Exception;
-use function call_user_func_array;
 use Illuminate\Container\Container;
 
 class MailableReader
@@ -13,7 +14,7 @@ class MailableReader
      *
      * @param EmailComposer $composer
      */
-    public function read(EmailComposer $composer)
+    public function read(EmailComposer $composer): void
     {
         Container::getInstance()->call([$composer->getData('mailable'), 'build']);
 
@@ -38,7 +39,7 @@ public function read(EmailComposer $composer)
      * @param string $from
      * @return array
      */
-    private function convertMailableAddresses($from)
+    private function convertMailableAddresses($from): array
     {
         return collect($from)->map(function ($recipient) {
             return $recipient['address'];
@@ -50,7 +51,7 @@ private function convertMailableAddresses($from)
      *
      * @param EmailComposer $composer
      */
-    private function readRecipient(EmailComposer $composer)
+    private function readRecipient(EmailComposer $composer): void
     {
         $to = $this->convertMailableAddresses(
             $composer->getData('mailable')->to
@@ -64,7 +65,7 @@ private function readRecipient(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function readFrom(EmailComposer $composer)
+    private function readFrom(EmailComposer $composer): void
     {
         $from = reset($composer->getData('mailable')->from);
 
@@ -83,7 +84,7 @@ private function readFrom(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function readCc(EmailComposer $composer)
+    private function readCc(EmailComposer $composer): void
     {
         $cc = $this->convertMailableAddresses(
             $composer->getData('mailable')->cc
@@ -97,7 +98,7 @@ private function readCc(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function readBcc(EmailComposer $composer)
+    private function readBcc(EmailComposer $composer): void
     {
         $bcc = $this->convertMailableAddresses(
             $composer->getData('mailable')->bcc
@@ -111,7 +112,7 @@ private function readBcc(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function readSubject(EmailComposer $composer)
+    private function readSubject(EmailComposer $composer): void
     {
         $composer->subject($composer->getData('mailable')->subject);
     }
@@ -122,7 +123,7 @@ private function readSubject(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws Exception
      */
-    private function readBody(EmailComposer $composer)
+    private function readBody(EmailComposer $composer): void
     {
         if (app()->version() < '5.5') {
             throw new Exception('Mailables cannot be read by Laravel 5.4 and below. Sorry.');
@@ -140,7 +141,7 @@ private function readBody(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function readAttachments(EmailComposer $composer)
+    private function readAttachments(EmailComposer $composer): void
     {
         $mailable = $composer->getData('mailable');
 
diff --git a/src/MessageSent.php b/src/MessageSent.php
new file mode 100644
index 0000000..3ca6e6e
--- /dev/null
+++ b/src/MessageSent.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stackkit\LaravelDatabaseEmails;
+
+class MessageSent
+{
+    /**
+     * @var \Illuminate\Mail\SentMessage
+     */
+    public $message;
+
+    public function __construct($message)
+    {
+        $this->message = $message;
+    }
+}
diff --git a/src/Preparer.php b/src/Preparer.php
index 60b5fec..831e0c0 100644
--- a/src/Preparer.php
+++ b/src/Preparer.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Carbon\Carbon;
@@ -11,7 +13,7 @@ class Preparer
      *
      * @param EmailComposer $composer
      */
-    public function prepare(EmailComposer $composer)
+    public function prepare(EmailComposer $composer): void
     {
         $this->prepareLabel($composer);
 
@@ -45,7 +47,7 @@ public function prepare(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareLabel(EmailComposer $composer)
+    private function prepareLabel(EmailComposer $composer): void
     {
         if (! $composer->hasData('label')) {
             return;
@@ -61,7 +63,7 @@ private function prepareLabel(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareRecipient(EmailComposer $composer)
+    private function prepareRecipient(EmailComposer $composer): void
     {
         if (Config::testing()) {
             $composer->recipient(Config::testEmailAddress());
@@ -77,7 +79,7 @@ private function prepareRecipient(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareFrom(EmailComposer $composer)
+    private function prepareFrom(EmailComposer $composer): void
     {
         $composer->getEmail()->fill([
             'from' => json_encode($composer->getData('from', '')),
@@ -89,7 +91,7 @@ private function prepareFrom(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareCc(EmailComposer $composer)
+    private function prepareCc(EmailComposer $composer): void
     {
         if (Config::testing()) {
             $composer->setData('cc', []);
@@ -105,7 +107,7 @@ private function prepareCc(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareBcc(EmailComposer $composer)
+    private function prepareBcc(EmailComposer $composer): void
     {
         if (Config::testing()) {
             $composer->setData('bcc', []);
@@ -121,7 +123,7 @@ private function prepareBcc(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareSubject(EmailComposer $composer)
+    private function prepareSubject(EmailComposer $composer): void
     {
         $composer->getEmail()->fill([
             'subject' => $composer->getData('subject'),
@@ -133,7 +135,7 @@ private function prepareSubject(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareView(EmailComposer $composer)
+    private function prepareView(EmailComposer $composer): void
     {
         $composer->getEmail()->fill([
             'view' => $composer->getData('view'),
@@ -145,7 +147,7 @@ private function prepareView(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareVariables(EmailComposer $composer)
+    private function prepareVariables(EmailComposer $composer): void
     {
         if (! $composer->hasData('variables')) {
             return;
@@ -161,7 +163,7 @@ private function prepareVariables(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareBody(EmailComposer $composer)
+    private function prepareBody(EmailComposer $composer): void
     {
         // If the body was predefined (by for example a mailable), use that.
         if ($composer->hasData('body')) {
@@ -181,7 +183,7 @@ private function prepareBody(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareAttachments(EmailComposer $composer)
+    private function prepareAttachments(EmailComposer $composer): void
     {
         $attachments = [];
 
@@ -209,7 +211,7 @@ private function prepareAttachments(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareScheduled(EmailComposer $composer)
+    private function prepareScheduled(EmailComposer $composer): void
     {
         if (! $composer->hasData('scheduled_at')) {
             return;
@@ -231,7 +233,7 @@ private function prepareScheduled(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareImmediately(EmailComposer $composer)
+    private function prepareImmediately(EmailComposer $composer): void
     {
         if (Config::sendImmediately()) {
             $composer->getEmail()->fill(['sending' => 1]);
@@ -243,7 +245,7 @@ private function prepareImmediately(EmailComposer $composer)
      *
      * @param EmailComposer $composer
      */
-    private function prepareQueued(EmailComposer $composer)
+    private function prepareQueued(EmailComposer $composer): void
     {
         if ($composer->getData('queued', false) === true) {
             $composer->getEmail()->fill([
diff --git a/src/SendEmailJob.php b/src/SendEmailJob.php
index 4ca3070..a7ba528 100644
--- a/src/SendEmailJob.php
+++ b/src/SendEmailJob.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 
 namespace Stackkit\LaravelDatabaseEmails;
 
@@ -11,7 +12,10 @@
 
 class SendEmailJob implements ShouldQueue
 {
-    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+    use Dispatchable;
+    use InteractsWithQueue;
+    use Queueable;
+    use SerializesModels;
 
     public $email;
 
@@ -20,7 +24,7 @@ public function __construct(Email $email)
         $this->email = $email;
     }
 
-    public function handle()
+    public function handle(): void
     {
         (new Sender())->send($this->email);
     }
diff --git a/src/SendEmailsCommand.php b/src/SendEmailsCommand.php
index d1bca2d..039ca37 100644
--- a/src/SendEmailsCommand.php
+++ b/src/SendEmailsCommand.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Exception;
@@ -46,7 +48,7 @@ public function __construct(Store $store)
      *
      * @return void
      */
-    public function handle()
+    public function handle(): void
     {
         $emails = $this->store->getQueue();
 
@@ -73,23 +75,13 @@ public function handle()
         $this->result($emails);
     }
 
-    /**
-     * Execute the console command (backwards compatibility for Laravel 5.4 and below).
-     *
-     * @return void
-     */
-    public function fire()
-    {
-        $this->handle();
-    }
-
     /**
      * Output a table with the cronjob result.
      *
      * @param Collection $emails
      * @return void
      */
-    protected function result($emails)
+    protected function result(Collection $emails): void
     {
         $headers = ['ID', 'Recipient', 'Subject', 'Status'];
 
diff --git a/src/Sender.php b/src/Sender.php
index 567819f..2a9bf63 100644
--- a/src/Sender.php
+++ b/src/Sender.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Illuminate\Mail\Message;
@@ -12,7 +14,7 @@ class Sender
      *
      * @param Email $email
      */
-    public function send(Email $email)
+    public function send(Email $email): void
     {
         if ($email->isSent()) {
             return;
@@ -20,10 +22,16 @@ public function send(Email $email)
 
         $email->markAsSending();
 
-        Mail::send([], [], function (Message $message) use ($email) {
+        $sentMessage = Mail::send([], [], function (Message $message) use ($email) {
             $this->buildMessage($message, $email);
         });
 
+        // This is used so we can assert things on the sent message in Laravel 9+ since we cannot use
+        // the Swift Mailer plugin anymore. So this is purely used for in the PHPUnit tests.
+        if (version_compare(app()->version(), '9.0.0', '>=') && !is_null($sentMessage)) {
+            event(new MessageSent($sentMessage));
+        }
+
         $email->markAsSent();
     }
 
@@ -33,21 +41,28 @@ public function send(Email $email)
      * @param  Message $message
      * @param  Email   $email
      */
-    private function buildMessage(Message $message, Email $email)
+    private function buildMessage(Message $message, Email $email): void
     {
         $message->to($email->getRecipient())
             ->cc($email->hasCc() ? $email->getCc() : [])
             ->bcc($email->hasBcc() ? $email->getBcc() : [])
             ->subject($email->getSubject())
-            ->from($email->getFromAddress(), $email->getFromName())
-            ->setBody($email->getBody(), 'text/html');
+            ->from($email->getFromAddress(), $email->getFromName());
+
+        if (version_compare(app()->version(), '9.0.0', '>=')) {
+            // Symfony Mailer
+            $message->html($email->getBody());
+        } else {
+            // SwiftMail
+            $message->setBody($email->getBody(), 'text/html');
+        }
 
         $attachmentMap = [
             'attachment'    => 'attach',
             'rawAttachment' => 'attachData',
         ];
 
-        foreach ((array) $email->getAttachments() as $attachment) {
+        foreach ($email->getAttachments() as $attachment) {
             call_user_func_array([$message, $attachmentMap[$attachment['type']]], $attachment['attachment']);
         }
     }
diff --git a/src/SentMessage.php b/src/SentMessage.php
new file mode 100644
index 0000000..98c6156
--- /dev/null
+++ b/src/SentMessage.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stackkit\LaravelDatabaseEmails;
+
+use Swift_Mime_SimpleMimeEntity;
+use Symfony\Component\Mime\Part\DataPart;
+
+class SentMessage
+{
+    public $from = [];
+    public $to = [];
+    public $cc = [];
+    public $bcc = [];
+    public $subject = '';
+    public $body = '';
+    public $attachments = [];
+    public $headers = [];
+
+    public static function createFromSymfonyMailer(\Symfony\Component\Mime\Email $email): SentMessage
+    {
+        $sentMessage = new self();
+
+        foreach ($email->getFrom() as $address) {
+            $sentMessage->from[$address->getAddress()] = $address->getName();
+        }
+
+        foreach ($email->getTo() as $address) {
+            $sentMessage->to[$address->getAddress()] = $address->getName();
+        }
+
+        foreach ($email->getCc() as $address) {
+            $sentMessage->cc[$address->getAddress()] = $address->getName();
+        }
+
+        foreach ($email->getBcc() as $address) {
+            $sentMessage->bcc[$address->getAddress()] = $address->getName();
+        }
+
+        $sentMessage->subject = $email->getSubject();
+        $sentMessage->body = $email->getHtmlBody();
+        $sentMessage->attachments = array_map(function (DataPart $dataPart) {
+            return [
+                'body' => $dataPart->getBody(),
+                'disposition' => $dataPart->asDebugString(),
+            ];
+        }, $email->getAttachments());
+
+        return $sentMessage;
+    }
+
+    public static function createFromSwiftMailer(\Swift_Mime_SimpleMessage $message): SentMessage
+    {
+        $sentMessage = new self();
+
+        $sentMessage->from = $message->getFrom();
+        $sentMessage->to = $message->getTo();
+        $sentMessage->cc = $message->getCc();
+        $sentMessage->bcc = $message->getBcc();
+        $sentMessage->subject = $message->getSubject();
+        $sentMessage->body = $message->getBody();
+        $sentMessage->attachments = array_map(function(Swift_Mime_SimpleMimeEntity $entity) {
+            return [
+                'body' => $entity->getBody(),
+                'disposition' => $entity->getContentType() . ' ' . $entity->getHeaders()->get('content-disposition'),
+            ];
+        }, $message->getChildren());
+
+        return $sentMessage;
+    }
+}
diff --git a/src/Store.php b/src/Store.php
index a6b3eb2..3a9f4f2 100644
--- a/src/Store.php
+++ b/src/Store.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Carbon\Carbon;
@@ -12,9 +14,9 @@ class Store
      *
      * @return Collection|Email[]
      */
-    public function getQueue()
+    public function getQueue(): Collection
     {
-        $query = new Email;
+        $query = new Email();
 
         return $query
             ->whereNull('deleted_at')
diff --git a/src/Validator.php b/src/Validator.php
index 0dfc946..038c484 100644
--- a/src/Validator.php
+++ b/src/Validator.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Stackkit\LaravelDatabaseEmails;
 
 use Exception;
@@ -21,7 +23,7 @@ class Validator
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    public function validate(EmailComposer $composer)
+    public function validate(EmailComposer $composer): void
     {
         $this->validateLabel($composer);
 
@@ -46,7 +48,7 @@ public function validate(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateLabel(EmailComposer $composer)
+    private function validateLabel(EmailComposer $composer): void
     {
         if ($composer->hasData('label') && strlen($composer->getData('label')) > 255) {
             throw new InvalidArgumentException('The given label [' . $composer->getData('label') . '] is too large for database storage');
@@ -59,7 +61,7 @@ private function validateLabel(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateRecipient(EmailComposer $composer)
+    private function validateRecipient(EmailComposer $composer): void
     {
         if (! $composer->hasData('recipient')) {
             throw new InvalidArgumentException('No recipient specified');
@@ -84,7 +86,7 @@ private function validateRecipient(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateCc(EmailComposer $composer)
+    private function validateCc(EmailComposer $composer): void
     {
         if (! $composer->hasData('cc')) {
             return;
@@ -103,7 +105,7 @@ private function validateCc(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateBcc(EmailComposer $composer)
+    private function validateBcc(EmailComposer $composer): void
     {
         if (! $composer->hasData('bcc')) {
             return;
@@ -122,7 +124,7 @@ private function validateBcc(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateSubject(EmailComposer $composer)
+    private function validateSubject(EmailComposer $composer): void
     {
         if (! $composer->hasData('subject')) {
             throw new InvalidArgumentException('No subject specified');
@@ -135,7 +137,7 @@ private function validateSubject(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidARgumentException
      */
-    private function validateView(EmailComposer $composer)
+    private function validateView(EmailComposer $composer): void
     {
         if ($composer->hasData('mailable')) {
             return;
@@ -158,7 +160,7 @@ private function validateView(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateVariables(EmailComposer $composer)
+    private function validateVariables(EmailComposer $composer): void
     {
         if ($composer->hasData('variables') && ! is_array($composer->getData('variables'))) {
             throw new InvalidArgumentException('Variables must be an array');
@@ -171,7 +173,7 @@ private function validateVariables(EmailComposer $composer)
      * @param EmailComposer $composer
      * @throws InvalidArgumentException
      */
-    private function validateScheduled(EmailComposer $composer)
+    private function validateScheduled(EmailComposer $composer): void
     {
         if (! $composer->hasData('scheduled_at')) {
             return;
diff --git a/tests/SendEmailsCommandTest.php b/tests/SendEmailsCommandTest.php
index 5aacca4..ccd38d7 100644
--- a/tests/SendEmailsCommandTest.php
+++ b/tests/SendEmailsCommandTest.php
@@ -68,7 +68,7 @@ public function if_an_email_fails_to_be_sent_it_should_be_logged_in_the_database
         $this->artisan('email:send');
 
         $this->assertTrue($email->fresh()->hasFailed());
-        $this->assertStringContains('Swift_RfcComplianceException', $email->fresh()->getError());
+        $this->assertStringContainsString('RfcComplianceException', $email->fresh()->getError());
     }
 
     /** @test */
diff --git a/tests/SenderTest.php b/tests/SenderTest.php
index 9cc2bfd..686bd50 100644
--- a/tests/SenderTest.php
+++ b/tests/SenderTest.php
@@ -2,6 +2,9 @@
 
 namespace Tests;
 
+use Illuminate\Support\Facades\Event;
+use Stackkit\LaravelDatabaseEmails\MessageSent;
+use Stackkit\LaravelDatabaseEmails\SentMessage;
 use Swift_Events_SendEvent;
 use Illuminate\Support\Facades\Mail;
 use Stackkit\LaravelDatabaseEmails\Email;
@@ -15,7 +18,15 @@ public function setUp(): void
     {
         parent::setUp();
 
-        Mail::getSwiftMailer()->registerPlugin(new TestingMailEventListener($this));
+        if (version_compare(app()->version(), '9.0.0', '>=')) {
+            Event::listen(MessageSent::class, function (MessageSent $event) {
+                $this->sent[] = SentMessage::createFromSymfonyMailer(
+                    $event->message->getSymfonySentMessage()->getOriginalMessage()
+                );
+            });
+        } else {
+            Mail::getSwiftMailer()->registerPlugin(new TestingMailEventListener($this));
+        }
     }
 
     /** @test */
@@ -38,7 +49,7 @@ public function the_email_has_a_correct_from_email_and_from_name()
 
         $this->artisan('email:send');
 
-        $from = reset($this->sent)->getMessage()->getFrom();
+        $from = reset($this->sent)->from;
 
         $this->assertEquals('testfromaddress@gmail.com', key($from));
         $this->assertEquals('From CI test', $from[key($from)]);
@@ -48,7 +59,7 @@ public function the_email_has_a_correct_from_email_and_from_name()
 
         $this->composeEmail()->from('marick@dolphiq.nl', 'Marick')->send();
         $this->artisan('email:send');
-        $from = reset($this->sent)->getMessage()->getFrom();
+        $from = reset($this->sent)->from;
         $this->assertEquals('marick@dolphiq.nl', key($from));
         $this->assertEquals('Marick', $from[key($from)]);
 
@@ -56,7 +67,7 @@ public function the_email_has_a_correct_from_email_and_from_name()
         $this->sent = [];
         $this->composeEmail()->from('marick@dolphiq.nl')->send();
         $this->artisan('email:send');
-        $from = reset($this->sent)->getMessage()->getFrom();
+        $from = reset($this->sent)->from;
         $this->assertEquals('marick@dolphiq.nl', key($from));
         $this->assertEquals(config('mail.from.name'), $from[key($from)]);
 
@@ -64,7 +75,7 @@ public function the_email_has_a_correct_from_email_and_from_name()
         $this->sent = [];
         $this->composeEmail()->from(null, 'Marick')->send();
         $this->artisan('email:send');
-        $from = reset($this->sent)->getMessage()->getFrom();
+        $from = reset($this->sent)->from;
         $this->assertEquals(config('mail.from.address'), key($from));
         $this->assertEquals('Marick', $from[key($from)]);
     }
@@ -74,14 +85,14 @@ public function it_sends_emails_to_the_correct_recipients()
     {
         $this->sendEmail(['recipient' => 'john@doe.com']);
         $this->artisan('email:send');
-        $to = reset($this->sent)->getMessage()->getTo();
+        $to = reset($this->sent)->to;
         $this->assertCount(1, $to);
         $this->assertArrayHasKey('john@doe.com', $to);
 
         $this->sent = [];
         $this->sendEmail(['recipient' => ['john@doe.com', 'john+2@doe.com']]);
         $this->artisan('email:send');
-        $to = reset($this->sent)->getMessage()->getTo();
+        $to = reset($this->sent)->to;
         $this->assertCount(2, $to);
         $this->assertArrayHasKey('john@doe.com', $to);
         $this->assertArrayHasKey('john+2@doe.com', $to);
@@ -92,14 +103,14 @@ public function it_adds_the_cc_addresses()
     {
         $this->sendEmail(['cc' => 'cc@test.com']);
         $this->artisan('email:send');
-        $cc = reset($this->sent)->getMessage()->getCc();
+        $cc = reset($this->sent)->cc;
         $this->assertCount(1, $cc);
         $this->assertArrayHasKey('cc@test.com', $cc);
 
         $this->sent = [];
         $this->sendEmail(['cc' => ['cc@test.com', 'cc+2@test.com']]);
         $this->artisan('email:send');
-        $cc = reset($this->sent)->getMessage()->getCc();
+        $cc = reset($this->sent)->cc;
         $this->assertCount(2, $cc);
         $this->assertArrayHasKey('cc@test.com', $cc);
         $this->assertArrayHasKey('cc+2@test.com', $cc);
@@ -110,14 +121,14 @@ public function it_adds_the_bcc_addresses()
     {
         $this->sendEmail(['bcc' => 'bcc@test.com']);
         $this->artisan('email:send');
-        $bcc = reset($this->sent)->getMessage()->getBcc();
+        $bcc = reset($this->sent)->bcc;
         $this->assertCount(1, $bcc);
         $this->assertArrayHasKey('bcc@test.com', $bcc);
 
         $this->sent = [];
         $this->sendEmail(['bcc' => ['bcc@test.com', 'bcc+2@test.com']]);
         $this->artisan('email:send');
-        $bcc = reset($this->sent)->getMessage()->getBcc();
+        $bcc = reset($this->sent)->bcc;
         $this->assertCount(2, $bcc);
         $this->assertArrayHasKey('bcc@test.com', $bcc);
         $this->assertArrayHasKey('bcc+2@test.com', $bcc);
@@ -130,7 +141,7 @@ public function the_email_has_the_correct_subject()
 
         $this->artisan('email:send');
 
-        $subject = reset($this->sent)->getMessage()->getSubject();
+        $subject = reset($this->sent)->subject;
 
         $this->assertEquals('Hello World', $subject);
     }
@@ -140,13 +151,13 @@ public function the_email_has_the_correct_body()
     {
         $this->sendEmail(['variables' => ['name' => 'John Doe']]);
         $this->artisan('email:send');
-        $body = reset($this->sent)->getMessage()->getBody();
-        $this->assertEquals(view('tests::dummy', ['name' => 'John Doe']), $body);
+        $body = reset($this->sent)->body;
+        $this->assertEquals((string) view('tests::dummy', ['name' => 'John Doe']), $body);
 
         $this->sent = [];
         $this->sendEmail(['variables' => []]);
         $this->artisan('email:send');
-        $body = reset($this->sent)->getMessage()->getBody();
+        $body = reset($this->sent)->body;
         $this->assertEquals(view('tests::dummy'), $body);
     }
 
@@ -158,34 +169,9 @@ public function attachments_are_added_to_the_email()
             ->send();
         $this->artisan('email:send');
 
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $attachment = reset($attachments);
+        $attachments = reset($this->sent)->attachments;
 
         $this->assertCount(1, $attachments);
-        $this->assertEquals('attachment; filename=pdf-sample.pdf', $attachment->getHeaders()->get('content-disposition')->getFieldBody());
-        $this->assertEquals('application/pdf', $attachment->getContentType());
-    }
-
-    /** @test */
-    public function attachments_are_not_added_if_the_data_is_not_valid()
-    {
-        $this->sent = [];
-        $this->composeEmail()->attach(null)->send();
-        $this->artisan('email:send');
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $this->assertCount(0, $attachments);
-
-        $this->sent = [];
-        $this->composeEmail()->attach(false)->send();
-        $this->artisan('email:send');
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $this->assertCount(0, $attachments);
-
-        $this->sent = [];
-        $this->composeEmail()->attach('')->send();
-        $this->artisan('email:send');
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $this->assertCount(0, $attachments);
     }
 
     /** @test */
@@ -200,13 +186,13 @@ public function raw_attachments_are_added_to_the_email()
             ->send();
         $this->artisan('email:send');
 
-        $attachments = reset($this->sent)->getMessage()->getChildren();
+        $attachments = reset($this->sent)->attachments;
         $attachment = reset($attachments);
 
         $this->assertCount(1, $attachments);
-        $this->assertEquals('attachment; filename=hello-ci.pdf', $attachment->getHeaders()->get('content-disposition')->getFieldBody());
-        $this->assertEquals('application/pdf', $attachment->getContentType());
-        $this->assertTrue(md5($attachment->getBody()) == md5($rawData));
+        $this->assertStringContainsString('hello-ci.pdf', $attachment['disposition']);
+        $this->assertStringContainsString('application/pdf', $attachment['disposition']);
+        $this->assertTrue(md5($attachment['body']) == md5($rawData));
     }
 
     /** @test */
@@ -239,26 +225,4 @@ public function emails_can_be_sent_immediately()
         $this->artisan('email:send');
         $this->assertCount(1, $this->sent);
     }
-
-    /** @test */
-    public function raw_attachments_are_not_added_if_the_data_is_not_valid()
-    {
-        $this->sent = [];
-        $this->composeEmail()->attachData(null, 'test.png')->send();
-        $this->artisan('email:send');
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $this->assertCount(0, $attachments);
-
-        $this->sent = [];
-        $this->composeEmail()->attachData(false, 'test.png')->send();
-        $this->artisan('email:send');
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $this->assertCount(0, $attachments);
-
-        $this->sent = [];
-        $this->composeEmail()->attachData('', 'test.png')->send();
-        $this->artisan('email:send');
-        $attachments = reset($this->sent)->getMessage()->getChildren();
-        $this->assertCount(0, $attachments);
-    }
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index a2ddf40..6223864 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -2,7 +2,6 @@
 
 namespace Tests;
 
-use Eloquent;
 use Stackkit\LaravelDatabaseEmails\Email;
 
 class TestCase extends \Orchestra\Testbench\TestCase
@@ -32,26 +31,6 @@ function () {
         Email::truncate();
     }
 
-    /**
-     * Get a database connection instance.
-     *
-     * @return \Illuminate\Database\Connection
-     */
-    protected function connection()
-    {
-        return Eloquent::getConnectionResolver()->connection();
-    }
-
-    /**
-     * Get a schema builder instance.
-     *
-     * @return \Illuminate\Database\Schema\Builder
-     */
-    protected function schema()
-    {
-        return $this->connection()->getSchemaBuilder();
-    }
-
     /**
      * Get package providers.  At a minimum this is the package being tested, but also
      * would include packages upon which our package depends, e.g. Cartalyst/Sentry
@@ -137,13 +116,4 @@ public function queueEmail($connection = null, $queue = null, $delay = null, $ov
     {
         return $this->createEmail($overwrite)->queue($connection, $queue, $delay);
     }
-
-    public function assertStringContains($needle, $haystack)
-    {
-        if (method_exists($this, 'assertStringContainsString')) {
-            $this->assertStringContainsString($needle, $haystack);
-        } else {
-            $this->assertContains($needle, $haystack);
-        }
-    }
 }
diff --git a/tests/TestingMailEventListener.php b/tests/TestingMailEventListener.php
index b143350..4fa32f1 100644
--- a/tests/TestingMailEventListener.php
+++ b/tests/TestingMailEventListener.php
@@ -2,6 +2,7 @@
 
 namespace Tests;
 
+use Stackkit\LaravelDatabaseEmails\SentMessage;
 use Swift_Events_EventListener;
 
 class TestingMailEventListener implements Swift_Events_EventListener
@@ -14,8 +15,8 @@ public function __construct(TestCase $test)
         $this->test = $test;
     }
 
-    public function beforeSendPerformed($event)
+    public function beforeSendPerformed(\Swift_Events_Event $event)
     {
-        $this->test->sent[] = $event;
+        $this->test->sent[] = SentMessage::createFromSwiftMailer($event->getMessage());
     }
 }
diff --git a/tests/ValidatorTest.php b/tests/ValidatorTest.php
index 0646c70..20f86a0 100644
--- a/tests/ValidatorTest.php
+++ b/tests/ValidatorTest.php
@@ -139,7 +139,7 @@ public function variables_must_be_defined_as_an_array()
             try {
                 $email->variables($type)->send();
                 $this->fail('Expected exception to be thrown');
-            } catch (InvalidArgumentException $e) {
+            } catch (\TypeError $e) {
                 $this->assertEquals($e->getCode(), 0);
             }
         }