diff --git a/src/CastsEnums.php b/src/CastsEnums.php
index 42ddcbc..2765032 100644
--- a/src/CastsEnums.php
+++ b/src/CastsEnums.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the CastsEnums trait.
  *
@@ -116,7 +118,7 @@ private function getEnumClass($key)
     {
         $result = $this->enums[$key];
         if (strpos($result, '@')) {
-            $class  = Str::before($result, '@');
+            $class = Str::before($result, '@');
             $method = Str::after($result, '@');
 
             // If no namespace was set, prepend the Model's namespace to the
diff --git a/src/Commands/EnumMakeCommand.php b/src/Commands/EnumMakeCommand.php
index 309f19a..aac7c2e 100644
--- a/src/Commands/EnumMakeCommand.php
+++ b/src/Commands/EnumMakeCommand.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Konekt\Enum\Eloquent\Commands;
 
 use Illuminate\Console\GeneratorCommand;
diff --git a/src/EnumServiceProvider.php b/src/EnumServiceProvider.php
index 7dcb4f6..03c9749 100644
--- a/src/EnumServiceProvider.php
+++ b/src/EnumServiceProvider.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Konekt\Enum\Eloquent;
 
 use Illuminate\Support\ServiceProvider;
diff --git a/src/EnumsAreCompatibleWithLaravelForms.php b/src/EnumsAreCompatibleWithLaravelForms.php
index 52abe31..284461a 100644
--- a/src/EnumsAreCompatibleWithLaravelForms.php
+++ b/src/EnumsAreCompatibleWithLaravelForms.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the EnumsAreCompatibleWithLaravelForms trait.
  *
diff --git a/tests/AAASmokeTest.php b/tests/AAASmokeTest.php
index 304e853..03a0315 100644
--- a/tests/AAASmokeTest.php
+++ b/tests/AAASmokeTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the AAASmokeTest.php class.
  *
@@ -13,7 +15,7 @@
 
 class AAASmokeTest extends TestCase
 {
-    const MIN_PHP_VERSION = '8.0.0';
+    public const MIN_PHP_VERSION = '8.0.0';
 
     /**
      * @test
diff --git a/tests/DynamicClassResolverTest.php b/tests/DynamicClassResolverTest.php
index adfe807..68a0018 100644
--- a/tests/DynamicClassResolverTest.php
+++ b/tests/DynamicClassResolverTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the DynamicClassResolverTest class.
  *
@@ -26,7 +28,7 @@ class DynamicClassResolverTest extends TestCase
     public function it_resolves_fqcn_enum_class_name_from_the_at_notation()
     {
         $address = Address::create([
-            'type'    => AddressType::SHIPPING,
+            'type' => AddressType::SHIPPING,
             'address' => 'Richard Avenue 33'
         ]);
 
@@ -39,7 +41,7 @@ public function it_resolves_fqcn_enum_class_name_from_the_at_notation()
     public function it_resolves_local_enum_class_name_from_the_at_notation()
     {
         $address = Address::create([
-            'type'    => AddressType::SHIPPING,
+            'type' => AddressType::SHIPPING,
             'address' => 'Richard Avenue 33'
         ]);
 
@@ -62,7 +64,7 @@ public function at_notation_does_not_collide_if_class_name_is_in_nampespace()
     public function it_keeps_original_namespace_with_at_notation_when_using_short_classnames_in_extended_classes()
     {
         $address = ExtendedAddress::create([
-            'type'    => AddressType::BILLING,
+            'type' => AddressType::BILLING,
             'address' => 'Alexander Platz 1.'
         ]);
 
diff --git a/tests/EnumAccessorTest.php b/tests/EnumAccessorTest.php
index e6f4964..c6ff479 100644
--- a/tests/EnumAccessorTest.php
+++ b/tests/EnumAccessorTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the EnumAccessorTest class.
  *
@@ -14,10 +16,10 @@
 use Konekt\Enum\Eloquent\Tests\Models\Client;
 use Konekt\Enum\Eloquent\Tests\Models\Order;
 use Konekt\Enum\Eloquent\Tests\Models\OrderStatus;
-use Konekt\Enum\Eloquent\Tests\Models\OrderV2;
 use Konekt\Enum\Eloquent\Tests\Models\OrderStatusV2;
-use Konekt\Enum\Eloquent\Tests\Models\OrderVX;
 use Konekt\Enum\Eloquent\Tests\Models\OrderStatusVX;
+use Konekt\Enum\Eloquent\Tests\Models\OrderV2;
+use Konekt\Enum\Eloquent\Tests\Models\OrderVX;
 
 class EnumAccessorTest extends TestCase
 {
@@ -111,8 +113,8 @@ public function it_can_still_read_basic_properties_as_well()
     public function it_can_still_read_casted_fields()
     {
         $order = Order::create([
-            'number'    => 'KH8FRWAD',
-            'status'    => OrderStatus::PROCESSING,
+            'number' => 'KH8FRWAD',
+            'status' => OrderStatus::PROCESSING,
             'is_active' => 1
         ]);
 
@@ -129,8 +131,8 @@ public function it_doesnt_break_related_properties()
         $client = Client::create(['name' => 'Britney Spears']);
 
         $order = Order::create([
-            'number'    => 'LDYG4G4',
-            'status'    => OrderStatus::PROCESSING,
+            'number' => 'LDYG4G4',
+            'status' => OrderStatus::PROCESSING,
             'client_id' => $client->id
         ]);
 
diff --git a/tests/EnumMutatorTest.php b/tests/EnumMutatorTest.php
index 9fa2327..cc75fc4 100644
--- a/tests/EnumMutatorTest.php
+++ b/tests/EnumMutatorTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the EnumMutatorTest class.
  *
@@ -73,7 +75,7 @@ public function it_accepts_enum_object_on_mass_assignment()
     public function it_doesnt_accept_scalars_that_arent_valid_enum_values()
     {
         $this->expectException(\UnexpectedValueException::class);
-        $order         = new Order();
+        $order = new Order();
         $order->status = 'wtf';
     }
 }
diff --git a/tests/EnumToArrayTest.php b/tests/EnumToArrayTest.php
index 9dce1ca..8f20af7 100644
--- a/tests/EnumToArrayTest.php
+++ b/tests/EnumToArrayTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the EnumAccessorTest class.
  *
@@ -12,9 +14,9 @@
 namespace Konekt\Enum\Eloquent\Tests;
 
 use Konekt\Enum\Eloquent\Tests\Models\Order;
+use Konekt\Enum\Eloquent\Tests\Models\OrderStatus;
 use Konekt\Enum\Eloquent\Tests\Models\OrderStatusV2;
 use Konekt\Enum\Eloquent\Tests\Models\OrderV2;
-use Konekt\Enum\Eloquent\Tests\Models\OrderStatus;
 
 class EnumToArrayTest extends TestCase
 {
@@ -63,7 +65,7 @@ public function to_array_still_works()
         ]);
 
         $attributesArray = $order->attributesToArray();
-        $array           = $order->toArray();
+        $array = $order->toArray();
 
         $this->assertEquals($array, $attributesArray);
     }
diff --git a/tests/Models/Address.php b/tests/Models/Address.php
index dd60170..39a8578 100644
--- a/tests/Models/Address.php
+++ b/tests/Models/Address.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Address class.
  *
@@ -21,7 +23,7 @@ class Address extends Model
     protected $guarded = ['id'];
 
     protected $enums = [
-        'type'   => 'Konekt\\Enum\\Eloquent\\Tests\\Resolvers\\AddressTypeResolver@enumClass',
+        'type' => 'Konekt\\Enum\\Eloquent\\Tests\\Resolvers\\AddressTypeResolver@enumClass',
         'status' => 'AddressStatusResolver@enumClass'
     ];
 }
diff --git a/tests/Models/AddressStatus.php b/tests/Models/AddressStatus.php
index a13d1da..4684e42 100644
--- a/tests/Models/AddressStatus.php
+++ b/tests/Models/AddressStatus.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the AddressStatus class.
  *
@@ -15,7 +17,7 @@
 
 class AddressStatus extends Enum
 {
-    const UNKNOWN   = null;
-    const VALID     = 'valid';
-    const INVALID   = 'invalid';
+    public const UNKNOWN = null;
+    public const VALID = 'valid';
+    public const INVALID = 'invalid';
 }
diff --git a/tests/Models/AddressStatusResolver.php b/tests/Models/AddressStatusResolver.php
index 6d5794d..2334d44 100644
--- a/tests/Models/AddressStatusResolver.php
+++ b/tests/Models/AddressStatusResolver.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the AddressStatusResolver class.
  *
diff --git a/tests/Models/AddressType.php b/tests/Models/AddressType.php
index af893ef..00cf9ab 100644
--- a/tests/Models/AddressType.php
+++ b/tests/Models/AddressType.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the AddressType class.
  *
@@ -15,6 +17,6 @@
 
 class AddressType extends Enum
 {
-    const BILLING  = 'billing';
-    const SHIPPING = 'shipping';
+    public const BILLING = 'billing';
+    public const SHIPPING = 'shipping';
 }
diff --git a/tests/Models/Client.php b/tests/Models/Client.php
index aabd878..1126adc 100644
--- a/tests/Models/Client.php
+++ b/tests/Models/Client.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Client model class.
  *
diff --git a/tests/Models/Eloquent.php b/tests/Models/Eloquent.php
index b0eaa05..ea15112 100644
--- a/tests/Models/Eloquent.php
+++ b/tests/Models/Eloquent.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Squirrel class.
  *
diff --git a/tests/Models/EloquentType.php b/tests/Models/EloquentType.php
index bfc2408..d2273c8 100644
--- a/tests/Models/EloquentType.php
+++ b/tests/Models/EloquentType.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the EloquentType enum class.
  *
@@ -15,7 +17,7 @@
 
 class EloquentType extends Enum
 {
-    const NADA      = null;
-    const WHATEVER  = 'whatever';
-    const NEVERMIND = 'nevermind';
+    public const NADA = null;
+    public const WHATEVER = 'whatever';
+    public const NEVERMIND = 'nevermind';
 }
diff --git a/tests/Models/EloquentTypeProxy.php b/tests/Models/EloquentTypeProxy.php
index 7433b1d..3eec640 100644
--- a/tests/Models/EloquentTypeProxy.php
+++ b/tests/Models/EloquentTypeProxy.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the EloquentTypeProxy class.
  *
diff --git a/tests/Models/Extended/Address.php b/tests/Models/Extended/Address.php
index 6883eab..cb29042 100644
--- a/tests/Models/Extended/Address.php
+++ b/tests/Models/Extended/Address.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Address class.
  *
diff --git a/tests/Models/Order.php b/tests/Models/Order.php
index 8bfe240..985385a 100644
--- a/tests/Models/Order.php
+++ b/tests/Models/Order.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Order model class.
  *
diff --git a/tests/Models/OrderStatus.php b/tests/Models/OrderStatus.php
index a128416..d9c4ca3 100644
--- a/tests/Models/OrderStatus.php
+++ b/tests/Models/OrderStatus.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the OrderStatus class.
  *
@@ -15,10 +17,10 @@
 
 class OrderStatus extends Enum
 {
-    const __DEFAULT = self::SUBMITTED;
+    public const __DEFAULT = self::SUBMITTED;
 
-    const SUBMITTED  = 'submitted';
-    const PROCESSING = 'processing';
-    const SHIPPING   = 'shipping';
-    const COMPLETED  = 'completed';
+    public const SUBMITTED = 'submitted';
+    public const PROCESSING = 'processing';
+    public const SHIPPING = 'shipping';
+    public const COMPLETED = 'completed';
 }
diff --git a/tests/Models/OrderStatusV2.php b/tests/Models/OrderStatusV2.php
index 15fe9f0..89c2d60 100644
--- a/tests/Models/OrderStatusV2.php
+++ b/tests/Models/OrderStatusV2.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the OrderStatus class with Enum version 2 default.
  *
@@ -15,10 +17,10 @@
 
 class OrderStatusV2 extends Enum
 {
-    const __default = self::SUBMITTED;
+    public const __default = self::SUBMITTED;
 
-    const SUBMITTED  = 'submitted';
-    const PROCESSING = 'processing';
-    const SHIPPING   = 'shipping';
-    const COMPLETED  = 'completed';
+    public const SUBMITTED = 'submitted';
+    public const PROCESSING = 'processing';
+    public const SHIPPING = 'shipping';
+    public const COMPLETED = 'completed';
 }
diff --git a/tests/Models/OrderStatusVX.php b/tests/Models/OrderStatusVX.php
index 0ac0c98..bdbc58a 100644
--- a/tests/Models/OrderStatusVX.php
+++ b/tests/Models/OrderStatusVX.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the OrderStatus class with Enum version 2 and 3 default.
  *
@@ -15,11 +17,11 @@
 
 class OrderStatusVX extends Enum
 {
-    const __DEFAULT = self::SUBMITTED;
-    const __default = self::SUBMITTED; // v2 default for backwards compatibility
+    public const __DEFAULT = self::SUBMITTED;
+    public const __default = self::SUBMITTED; // v2 default for backwards compatibility
 
-    const SUBMITTED  = 'submitted';
-    const PROCESSING = 'processing';
-    const SHIPPING   = 'shipping';
-    const COMPLETED  = 'completed';
+    public const SUBMITTED = 'submitted';
+    public const PROCESSING = 'processing';
+    public const SHIPPING = 'shipping';
+    public const COMPLETED = 'completed';
 }
diff --git a/tests/Models/OrderV2.php b/tests/Models/OrderV2.php
index 973c6e8..8f56206 100644
--- a/tests/Models/OrderV2.php
+++ b/tests/Models/OrderV2.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Order model class for Enum version 2 default.
  *
diff --git a/tests/Models/OrderVX.php b/tests/Models/OrderVX.php
index f7fff13..4fd64ee 100644
--- a/tests/Models/OrderVX.php
+++ b/tests/Models/OrderVX.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the Order model class for Enum version 2 and 3 default.
  *
diff --git a/tests/Resolvers/AddressTypeResolver.php b/tests/Resolvers/AddressTypeResolver.php
index 26e31c0..2a87e47 100644
--- a/tests/Resolvers/AddressTypeResolver.php
+++ b/tests/Resolvers/AddressTypeResolver.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the AddressTypeResolver class.
  *
diff --git a/tests/TestCase.php b/tests/TestCase.php
index fe50a82..59ec8ae 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Contains the TestCase class.
  *
@@ -31,7 +33,7 @@ protected function setUpDatabase()
     {
         $this->capsule = new Capsule();
         $this->capsule->addConnection([
-            'driver'   => 'sqlite',
+            'driver' => 'sqlite',
             'database' => ':memory:',
         ]);