diff --git a/src/core/src/Database/Eloquent/Concerns/HasAttributes.php b/src/core/src/Database/Eloquent/Concerns/HasAttributes.php
index 0c673d83..ebe428fc 100644
--- a/src/core/src/Database/Eloquent/Concerns/HasAttributes.php
+++ b/src/core/src/Database/Eloquent/Concerns/HasAttributes.php
@@ -64,7 +64,7 @@ public function getCasts(): array
             return static::$castsCache[static::class] = array_merge([$this->getKeyName() => $this->getKeyType()], $this->casts, $this->casts());
         }
 
-        return static::$castsCache[static::class] = $this->casts;
+        return static::$castsCache[static::class] = array_merge($this->casts, $this->casts());
     }
 
     /**
diff --git a/tests/Core/Database/Eloquent/Concerns/HasAttributesTest.php b/tests/Core/Database/Eloquent/Concerns/HasAttributesTest.php
new file mode 100644
index 00000000..8a3b8b8c
--- /dev/null
+++ b/tests/Core/Database/Eloquent/Concerns/HasAttributesTest.php
@@ -0,0 +1,96 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Hypervel\Tests\Core\Database\Eloquent\Concerns;
+
+use Hypervel\Database\Eloquent\Concerns\HasUuids;
+use Hypervel\Database\Eloquent\Model;
+use Hypervel\Testbench\TestCase;
+
+/**
+ * @internal
+ * @coversNothing
+ */
+class HasAttributesTest extends TestCase
+{
+    public function testGetCastsIncludesCastsMethodForIncrementingModels(): void
+    {
+        $model = new HasAttributesIncrementingModel();
+
+        $casts = $model->getCasts();
+
+        $this->assertArrayHasKey('id', $casts);
+        $this->assertArrayHasKey('data', $casts);
+        $this->assertSame('array', $casts['data']);
+    }
+
+    public function testGetCastsIncludesCastsMethodForNonIncrementingModels(): void
+    {
+        $model = new HasAttributesUuidModel();
+
+        $casts = $model->getCasts();
+
+        $this->assertArrayHasKey('data', $casts);
+        $this->assertSame('array', $casts['data']);
+    }
+
+    public function testGetCastsMergesPropertyAndMethodForNonIncrementingModels(): void
+    {
+        $model = new HasAttributesMixedCastsModel();
+
+        $casts = $model->getCasts();
+
+        // From $casts property
+        $this->assertArrayHasKey('config', $casts);
+        $this->assertSame('array', $casts['config']);
+
+        // From casts() method
+        $this->assertArrayHasKey('data', $casts);
+        $this->assertSame('array', $casts['data']);
+    }
+}
+
+class HasAttributesIncrementingModel extends Model
+{
+    protected ?string $table = 'test_models';
+
+    protected function casts(): array
+    {
+        return [
+            'data' => 'array',
+        ];
+    }
+}
+
+class HasAttributesUuidModel extends Model
+{
+    use HasUuids;
+
+    protected ?string $table = 'test_models';
+
+    protected function casts(): array
+    {
+        return [
+            'data' => 'array',
+        ];
+    }
+}
+
+class HasAttributesMixedCastsModel extends Model
+{
+    use HasUuids;
+
+    protected ?string $table = 'test_models';
+
+    protected array $casts = [
+        'config' => 'array',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'data' => 'array',
+        ];
+    }
+}