diff --git a/.gitattributes b/.gitattributes
index 799fedc..525249a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,7 +3,7 @@
 /tests export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
-/.php_cs export-ignore
+/.php-cs-fixer.php export-ignore
 /CHANGELOG.md export-ignore
 /README.md export-ignore
 /phpunit.xml.dist export-ignore
diff --git a/.gitignore b/.gitignore
index 897ae32..abff542 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 /composer.lock
 /vendor
 /.idea
-/.php_cs.cache
+/.php-cs-fixer.cache
 /.phpunit.result.cache
 /phpunit.xml
diff --git a/.php_cs b/.php-cs-fixer.php
similarity index 90%
rename from .php_cs
rename to .php-cs-fixer.php
index dfe791a..2f3ce41 100644
--- a/.php_cs
+++ b/.php-cs-fixer.php
@@ -1,6 +1,6 @@
 <?php
 
-$finder = PhpCsFixer\Finder::create()
+$finder = (new PhpCsFixer\Finder())
     ->notPath('config')
     ->notPath('vendor')
     ->in(__DIR__)
@@ -9,10 +9,13 @@
     ->ignoreDotFiles(true)
     ->ignoreVCS(true);
 
-return PhpCsFixer\Config::create()
+return (new PhpCsFixer\Config())
     ->setRules(
         [
-            'psr0'                                        => false,
+            '@PHP71Migration'                             => true,
+            '@PHP71Migration:risky'                       => true,
+            '@PHPUnit84Migration:risky'                   => true,
+            '@PSR12'                                      => true,
             '@PSR2'                                       => true,
             'align_multiline_comment'                     => true,
             'array_indentation'                           => true,
@@ -46,6 +49,7 @@
             'concat_space'                                => [
                 'spacing' => 'one',
             ],
+            'declare_strict_types'                        => false,
             'dir_constant'                                => true,
             'function_to_constant'                        => true,
             'function_typehint_space'                     => true,
@@ -78,7 +82,6 @@
             'no_multiline_whitespace_around_double_arrow' => true,
             'no_null_property_initialization'             => true,
             'no_short_bool_cast'                          => true,
-            'no_short_echo_tag'                           => true,
             'no_spaces_after_function_name'               => true,
             'no_spaces_inside_parenthesis'                => true,
             'no_superfluous_elseif'                       => true,
@@ -106,7 +109,12 @@
             'switch_case_semicolon_to_colon'              => true,
             'switch_case_space'                           => true,
             'ternary_to_null_coalescing'                  => true,
-            'trailing_comma_in_multiline_array'           => true,
+            'trailing_comma_in_multiline'                 => [
+                'after_heredoc' => true,
+                'elements'      => [
+                    'arrays',
+                ],
+            ],
             'visibility_required'                         => [
                 'elements' => ['property', 'method', 'const'],
             ],
diff --git a/src/Facades/TwilioClient.php b/src/Facades/TwilioClient.php
index ce214d2..1737bec 100644
--- a/src/Facades/TwilioClient.php
+++ b/src/Facades/TwilioClient.php
@@ -2,8 +2,8 @@
 
 namespace BabDev\Twilio\Facades;
 
-use BabDev\Twilio\Contracts\TwilioClient as TwilioClientContract;
 use BabDev\Twilio\ConnectionManager;
+use BabDev\Twilio\Contracts\TwilioClient as TwilioClientContract;
 use Illuminate\Support\Facades\Facade;
 use Twilio\Rest\Api\V2010\Account\CallInstance;
 use Twilio\Rest\Api\V2010\Account\MessageInstance;
diff --git a/src/Notifications/Channels/TwilioChannel.php b/src/Notifications/Channels/TwilioChannel.php
index 81fb2a8..18ac3b9 100644
--- a/src/Notifications/Channels/TwilioChannel.php
+++ b/src/Notifications/Channels/TwilioChannel.php
@@ -27,7 +27,7 @@ public function __construct(TwilioClient $twilio)
     /**
      * Send the given notification.
      *
-     * @param mixed $notifiable
+     * @param mixed        $notifiable
      * @param Notification $notification
      *
      * @return MessageInstance|null
diff --git a/src/Providers/TwilioProvider.php b/src/Providers/TwilioProvider.php
index 431b7b2..30656a1 100644
--- a/src/Providers/TwilioProvider.php
+++ b/src/Providers/TwilioProvider.php
@@ -92,9 +92,9 @@ private function registerHttpClient(): void
             TwilioHttpClient::class,
             static function (Application $app): TwilioHttpClient {
                 // If Guzzle is installed, then we will either use Laravel's native client or Guzzle directly
-                if (\class_exists(Guzzle::class)) {
+                if (class_exists(Guzzle::class)) {
                     // Use Laravel's HTTP client if able
-                    if (\class_exists(Factory::class)) {
+                    if (class_exists(Factory::class)) {
                         return new LaravelHttpClient($app->make(Factory::class));
                     }
 
diff --git a/tests/ConnectionManagerTest.php b/tests/ConnectionManagerTest.php
index 877c18e..b2cf4fa 100644
--- a/tests/ConnectionManagerTest.php
+++ b/tests/ConnectionManagerTest.php
@@ -7,6 +7,7 @@
 use BabDev\Twilio\Providers\TwilioProvider;
 use BabDev\Twilio\TwilioClient;
 use Illuminate\Contracts\Container\Container;
+use Illuminate\Support\ServiceProvider;
 use Orchestra\Testbench\TestCase;
 use Twilio\Rest\Api\V2010\Account\CallInstance;
 use Twilio\Rest\Api\V2010\Account\MessageInstance;
@@ -107,7 +108,7 @@ function (Container $container) use ($client): TwilioClientContract {
         $this->assertSame($message, $manager->message('me', 'Hello!', []));
     }
 
-    protected function getEnvironmentSetUp($app)
+    protected function getEnvironmentSetUp($app): void
     {
         // Setup connections configuration
         $app['config']->set(
@@ -136,8 +137,13 @@ protected function getEnvironmentSetUp($app)
         );
     }
 
-    protected function getPackageProviders($app)
+    /**
+     * @return class-string<ServiceProvider>
+     */
+    protected function getPackageProviders($app): array
     {
-        return [TwilioProvider::class];
+        return [
+            TwilioProvider::class,
+        ];
     }
 }
diff --git a/tests/Facades/TwilioClientTest.php b/tests/Facades/TwilioClientTest.php
index 3ec0f85..3f60477 100644
--- a/tests/Facades/TwilioClientTest.php
+++ b/tests/Facades/TwilioClientTest.php
@@ -8,6 +8,7 @@
 use BabDev\Twilio\Providers\TwilioProvider;
 use BabDev\Twilio\TwilioClient;
 use Illuminate\Contracts\Container\Container;
+use Illuminate\Support\ServiceProvider;
 use Orchestra\Testbench\TestCase;
 use Twilio\Rest\Api\V2010\Account\CallInstance;
 use Twilio\Rest\Api\V2010\Account\MessageInstance;
@@ -105,7 +106,7 @@ function (Container $container) use ($client): TwilioClientContract {
         $this->assertSame($message, \TwilioClient::message('me', 'Hello!', []));
     }
 
-    protected function getEnvironmentSetUp($app)
+    protected function getEnvironmentSetUp($app): void
     {
         // Setup connections configuration
         $app['config']->set(
@@ -134,14 +135,20 @@ protected function getEnvironmentSetUp($app)
         );
     }
 
-    protected function getPackageProviders($app)
+    /**
+     * @return class-string<ServiceProvider>
+     */
+    protected function getPackageProviders($app): array
     {
         return [
             TwilioProvider::class,
         ];
     }
 
-    protected function getPackageAliases($app)
+    /**
+     * @return array<string, class-string<ServiceProvider>>
+     */
+    protected function getPackageAliases($app): array
     {
         return [
             'TwilioClient' => TwilioClientFacade::class,
diff --git a/tests/Notifications/Channels/TwilioChannelTest.php b/tests/Notifications/Channels/TwilioChannelTest.php
index ccf60b6..987a259 100644
--- a/tests/Notifications/Channels/TwilioChannelTest.php
+++ b/tests/Notifications/Channels/TwilioChannelTest.php
@@ -14,14 +14,13 @@ final class TwilioChannelTest extends TestCase
 {
     public function testANotificationIsSent(): void
     {
-        /** @var TwilioClient|MockObject $twilio */
+        /** @var MockObject&TwilioClient $twilio */
         $twilio = $this->createMock(TwilioClient::class);
         $twilio->expects($this->once())
             ->method('message')
             ->willReturn($this->createMock(MessageInstance::class));
 
-        $notifiable = new class()
-        {
+        $notifiable = new class() {
             use Notifiable;
 
             public function via($notifiable)
@@ -35,8 +34,7 @@ public function routeNotificationForTwilio($notification)
             }
         };
 
-        $notification = new class() extends Notification
-        {
+        $notification = new class() extends Notification {
             public function toTwilio($notifiable)
             {
                 return 'This is a test';
@@ -48,13 +46,12 @@ public function toTwilio($notifiable)
 
     public function testANotificationIsNotSentWhenTheNotifiableDoesNotProvideARecipient(): void
     {
-        /** @var TwilioClient|MockObject $twilio */
+        /** @var MockObject&TwilioClient $twilio */
         $twilio = $this->createMock(TwilioClient::class);
         $twilio->expects($this->never())
             ->method('message');
 
-        $notifiable = new class()
-        {
+        $notifiable = new class() {
             use Notifiable;
 
             public function via($notifiable)
@@ -62,14 +59,13 @@ public function via($notifiable)
                 return ['twilio'];
             }
 
-            public function routeNotificationForTwilio($notification)
+            public function routeNotificationForTwilio($notification): void
             {
-                return null;
+
             }
         };
 
-        $notification = new class() extends Notification
-        {
+        $notification = new class() extends Notification {
             public function toTwilio($notifiable)
             {
                 return 'This is a test';
@@ -81,13 +77,12 @@ public function toTwilio($notifiable)
 
     public function testANotificationIsNotSentWhenTheNotificationDoesNotProvideAMessage(): void
     {
-        /** @var TwilioClient|MockObject $twilio */
+        /** @var MockObject&TwilioClient $twilio */
         $twilio = $this->createMock(TwilioClient::class);
         $twilio->expects($this->never())
             ->method('message');
 
-        $notifiable = new class()
-        {
+        $notifiable = new class() {
             use Notifiable;
 
             public function via($notifiable)
@@ -101,11 +96,9 @@ public function routeNotificationForTwilio($notification)
             }
         };
 
-        $notification = new class() extends Notification
-        {
-            public function toTwilio($notifiable)
+        $notification = new class() extends Notification {
+            public function toTwilio($notifiable): void
             {
-                return null;
             }
         };
 
diff --git a/tests/Providers/TwilioProviderTest.php b/tests/Providers/TwilioProviderTest.php
index f53a77d..7dc168e 100644
--- a/tests/Providers/TwilioProviderTest.php
+++ b/tests/Providers/TwilioProviderTest.php
@@ -28,7 +28,7 @@ public function testServicesAreRegistered(): void
         $this->assertInstanceOf(TwilioChannel::class, $this->app->get(ChannelManager::class)->driver('twilio'));
     }
 
-    protected function getEnvironmentSetUp($app)
+    protected function getEnvironmentSetUp($app): void
     {
         // Setup connections configuration
         $app['config']->set(
@@ -41,8 +41,13 @@ protected function getEnvironmentSetUp($app)
         );
     }
 
-    protected function getPackageProviders($app)
+    /**
+     * @return class-string<ServiceProvider>
+     */
+    protected function getPackageProviders($app): array
     {
-        return [TwilioProvider::class];
+        return [
+            TwilioProvider::class,
+        ];
     }
 }
diff --git a/tests/Twilio/Http/LaravelHttpClientTest.php b/tests/Twilio/Http/LaravelHttpClientTest.php
index 2e17a17..145ae81 100644
--- a/tests/Twilio/Http/LaravelHttpClientTest.php
+++ b/tests/Twilio/Http/LaravelHttpClientTest.php
@@ -13,7 +13,7 @@ final class LaravelHttpClientTest extends TestCase
 {
     public static function setUpBeforeClass(): void
     {
-        if (!\class_exists(Factory::class)) {
+        if (!class_exists(Factory::class)) {
             self::markTestSkipped('Test only applies to Laravel 7 or newer.');
         }
 
@@ -104,7 +104,7 @@ public function testAnExceptionIsThrownWhenThereIsAnErrorPerformingTheRequest():
         $factory = $this->app->make(Factory::class);
         $factory->fake(
             [
-                $url => static function () {
+                $url => static function (): void {
                     throw new \RuntimeException('Testing');
                 },
             ]
diff --git a/tests/TwilioClientTest.php b/tests/TwilioClientTest.php
index ef43341..1523295 100644
--- a/tests/TwilioClientTest.php
+++ b/tests/TwilioClientTest.php
@@ -17,7 +17,7 @@ public function testTheSdkInstanceCanBeRetrieved(): void
     {
         $defaultFrom = '+19418675309';
 
-        /** @var Client|MockObject $twilio */
+        /** @var MockObject&Client $twilio */
         $twilio = $this->createMock(Client::class);
 
         $this->assertSame($twilio, (new TwilioClient($twilio, $defaultFrom))->twilio());
@@ -31,14 +31,14 @@ public function testACallCanBeCreated(): void
             'url' => 'https://www.babdev.com',
         ];
 
-        /** @var CallList|MockObject $calls */
+        /** @var MockObject&CallList $calls */
         $calls = $this->createMock(CallList::class);
         $calls->expects($this->once())
             ->method('create')
             ->with($to, $defaultFrom, $params)
             ->willReturn($this->createMock(CallInstance::class));
 
-        /** @var Client|MockObject $twilio */
+        /** @var MockObject&Client $twilio */
         $twilio        = $this->createMock(Client::class);
         $twilio->calls = $calls;
 
@@ -54,18 +54,18 @@ public function testACallCanBeCreatedWithACustomFromNumber(): void
             'url' => 'https://www.babdev.com',
         ];
 
-        /** @var CallList|MockObject $calls */
+        /** @var MockObject&CallList $calls */
         $calls = $this->createMock(CallList::class);
         $calls->expects($this->once())
             ->method('create')
             ->with($to, $customFrom, $params)
             ->willReturn($this->createMock(CallInstance::class));
 
-        /** @var Client|MockObject $twilio */
+        /** @var MockObject&Client $twilio */
         $twilio        = $this->createMock(Client::class);
         $twilio->calls = $calls;
 
-        $this->assertInstanceOf(CallInstance::class, (new TwilioClient($twilio, $defaultFrom))->call($to, \array_merge($params, ['from' => $customFrom])));
+        $this->assertInstanceOf(CallInstance::class, (new TwilioClient($twilio, $defaultFrom))->call($to, array_merge($params, ['from' => $customFrom])));
     }
 
     public function testAMessageCanBeSent(): void
@@ -74,7 +74,7 @@ public function testAMessageCanBeSent(): void
         $defaultFrom = '+19418675309';
         $message = 'Test Message';
 
-        /** @var MessageList|MockObject $messages */
+        /** @var MockObject&MessageList $messages */
         $messages = $this->createMock(MessageList::class);
         $messages->expects($this->once())
             ->method('create')
@@ -87,7 +87,7 @@ public function testAMessageCanBeSent(): void
             )
             ->willReturn($this->createMock(MessageInstance::class));
 
-        /** @var Client|MockObject $twilio */
+        /** @var MockObject&Client $twilio */
         $twilio           = $this->createMock(Client::class);
         $twilio->messages = $messages;
 
@@ -101,7 +101,7 @@ public function testAMessageCanBeSentWithACustomFromNumber(): void
         $customFrom  = '+16518675309';
         $message = 'Test Message';
 
-        /** @var MessageList|MockObject $messages */
+        /** @var MockObject&MessageList $messages */
         $messages = $this->createMock(MessageList::class);
         $messages->expects($this->once())
             ->method('create')
@@ -114,7 +114,7 @@ public function testAMessageCanBeSentWithACustomFromNumber(): void
             )
             ->willReturn($this->createMock(MessageInstance::class));
 
-        /** @var Client|MockObject $twilio */
+        /** @var MockObject&Client $twilio */
         $twilio           = $this->createMock(Client::class);
         $twilio->messages = $messages;