diff --git a/docs/advanced-usage/validation-attributes.md b/docs/advanced-usage/validation-attributes.md
index aabdc183..cb3ef7b2 100644
--- a/docs/advanced-usage/validation-attributes.md
+++ b/docs/advanced-usage/validation-attributes.md
@@ -589,6 +589,15 @@ public int $closure;
 public int $closure; 
 ```
 
+### Lowercase
+
+[Docs](https://laravel.com/docs/9.x/validation#rule-lowercase)
+
+```php
+#[Lowercase]
+public string $closure; 
+```
+
 ### MacAddress
 
 [Docs](https://laravel.com/docs/9.x/validation#rule-mac)
@@ -989,6 +998,15 @@ public string $closure;
 public string $closure;
 ```
 
+### Uppercase
+
+[Docs](https://laravel.com/docs/9.x/validation#rule-uppercase)
+
+```php
+#[Uppercase]
+public string $closure; 
+```
+
 ### Url
 
 [Docs](https://laravel.com/docs/9.x/validation#rule-url)
diff --git a/src/Attributes/Validation/Lowercase.php b/src/Attributes/Validation/Lowercase.php
new file mode 100644
index 00000000..71ead99f
--- /dev/null
+++ b/src/Attributes/Validation/Lowercase.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Spatie\LaravelData\Attributes\Validation;
+
+use Attribute;
+
+#[Attribute(Attribute::TARGET_PROPERTY | Attribute::TARGET_PARAMETER)]
+class Lowercase extends StringValidationAttribute
+{
+    public static function keyword(): string
+    {
+        return 'lowercase';
+    }
+
+    public function parameters(): array
+    {
+        return [];
+    }
+}
diff --git a/src/Attributes/Validation/Uppercase.php b/src/Attributes/Validation/Uppercase.php
new file mode 100644
index 00000000..5d69acab
--- /dev/null
+++ b/src/Attributes/Validation/Uppercase.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Spatie\LaravelData\Attributes\Validation;
+
+use Attribute;
+
+#[Attribute(Attribute::TARGET_PROPERTY | Attribute::TARGET_PARAMETER)]
+class Uppercase extends StringValidationAttribute
+{
+    public static function keyword(): string
+    {
+        return 'uppercase';
+    }
+
+    public function parameters(): array
+    {
+        return [];
+    }
+}
diff --git a/src/Support/Validation/ValidationRuleFactory.php b/src/Support/Validation/ValidationRuleFactory.php
index 6133244a..6e52c93c 100644
--- a/src/Support/Validation/ValidationRuleFactory.php
+++ b/src/Support/Validation/ValidationRuleFactory.php
@@ -54,6 +54,7 @@
 use Spatie\LaravelData\Attributes\Validation\Json;
 use Spatie\LaravelData\Attributes\Validation\LessThan;
 use Spatie\LaravelData\Attributes\Validation\LessThanOrEqualTo;
+use Spatie\LaravelData\Attributes\Validation\Lowercase;
 use Spatie\LaravelData\Attributes\Validation\MacAddress;
 use Spatie\LaravelData\Attributes\Validation\Max;
 use Spatie\LaravelData\Attributes\Validation\MaxDigits;
@@ -89,6 +90,7 @@
 use Spatie\LaravelData\Attributes\Validation\Timezone;
 use Spatie\LaravelData\Attributes\Validation\Ulid;
 use Spatie\LaravelData\Attributes\Validation\Unique;
+use Spatie\LaravelData\Attributes\Validation\Uppercase;
 use Spatie\LaravelData\Attributes\Validation\Url;
 use Spatie\LaravelData\Attributes\Validation\Uuid;
 use Spatie\LaravelData\Exceptions\CouldNotCreateValidationRule;
@@ -162,6 +164,7 @@ protected function mapping(): array
             Json::keyword() => Json::class,
             LessThan::keyword() => LessThan::class,
             LessThanOrEqualTo::keyword() => LessThanOrEqualTo::class,
+            Lowercase::keyword() => Lowercase::class,
             MacAddress::keyword() => MacAddress::class,
             Max::keyword() => Max::class,
             MaxDigits::keyword() => MaxDigits::class,
@@ -196,6 +199,7 @@ protected function mapping(): array
             StringType::keyword() => StringType::class,
             Timezone::keyword() => Timezone::class,
             Unique::keyword() => Unique::class,
+            Uppercase::keyword() => Uppercase::class,
             Url::keyword() => Url::class,
             Ulid::keyword() => Ulid::class,
             Uuid::keyword() => Uuid::class,
diff --git a/tests/Datasets/Attributes/RulesDataset.php b/tests/Datasets/Attributes/RulesDataset.php
index 3e70ce68..0e7211cb 100644
--- a/tests/Datasets/Attributes/RulesDataset.php
+++ b/tests/Datasets/Attributes/RulesDataset.php
@@ -57,6 +57,7 @@
 use Spatie\LaravelData\Attributes\Validation\Json;
 use Spatie\LaravelData\Attributes\Validation\LessThan;
 use Spatie\LaravelData\Attributes\Validation\LessThanOrEqualTo;
+use Spatie\LaravelData\Attributes\Validation\Lowercase;
 use Spatie\LaravelData\Attributes\Validation\MacAddress;
 use Spatie\LaravelData\Attributes\Validation\Max;
 use Spatie\LaravelData\Attributes\Validation\MaxDigits;
@@ -92,6 +93,7 @@
 use Spatie\LaravelData\Attributes\Validation\Timezone;
 use Spatie\LaravelData\Attributes\Validation\Ulid;
 use Spatie\LaravelData\Attributes\Validation\Unique;
+use Spatie\LaravelData\Attributes\Validation\Uppercase;
 use Spatie\LaravelData\Attributes\Validation\Url;
 use Spatie\LaravelData\Attributes\Validation\Uuid;
 use Spatie\LaravelData\Exceptions\CannotBuildValidationRule;
@@ -312,6 +314,11 @@ function fixature(
         expected: 'lte:field',
     );
 
+    yield fixature(
+        attribute: new Lowercase(),
+        expected: 'lowercase',
+    );
+
     yield fixature(
         attribute: new MacAddress(),
         expected: 'mac_address',
@@ -397,6 +404,11 @@ function fixature(
         expected: 'timezone',
     );
 
+    yield fixature(
+        attribute: new Uppercase(),
+        expected: 'uppercase',
+    );
+
     yield fixature(
         attribute: new Url(),
         expected: 'url',