diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a64197f..86960a2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -6,18 +6,22 @@ First of all, **thank you** for contributing, **you are awesome**!
 Here are a few rules to follow in order to ease code reviews, and discussions before
 maintainers accept and merge your work.
 
-You MUST follow some coding standard rules, like [PSR-1](http://www.php-fig.org/psr/1/)
-and [PSR-2](http://www.php-fig.org/psr/2/). Fortunately, you can automate the fixing
-for that rules, using [PHP-CS-Fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer) tool.
-There is a configuration file included in this repository, named `.php_cs`.
+You MUST follow some coding standard rules, like [PSR-1][1]
+and [PSR-2][2]. Fortunately, you can automate the fixing
+for that rules, using [PHP-CS-Fixer][3] tool.
+There is a configuration file included in this repository, named `.php-cs-fixer.php`.
 
 You MUST run the test suite.
 
 You MUST write (or update) unit tests.
 
-Please, write [commit messages that make
-sense](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html),
-and [rebase your branch](http://git-scm.com/book/en/Git-Branching-Rebasing)
-before submitting your Pull Request.
+Please, write [commit messages that make sense][4],
+and [rebase your branch][5] before submitting your Pull Request.
 
 Thank you!
+
+[1]: http://www.php-fig.org/psr/1/
+[2]: http://www.php-fig.org/psr/2/
+[3]: https://github.com/FriendsOfPHP/PHP-CS-Fixer
+[4]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[5]: http://git-scm.com/book/en/Git-Branching-Rebasing
diff --git a/README.md b/README.md
index 7f195a3..d0b609b 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,4 @@
-ShortId
-=======
+# ShortId
 
 [![Total Downloads](https://poser.pugx.org/pugx/shortid-php/downloads.png)](https://packagist.org/packages/pugx/shortid-php)
 ![Build Status](https://github.com/PUGX/shortid-php/workflows/build/badge.svg)
@@ -9,10 +8,22 @@ ShortId
 [![SensioLabsInsight](https://insight.sensiolabs.com/projects/058a0905-b889-49a4-9752-766787fcaeae/mini.png)](https://insight.sensiolabs.com/projects/058a0905-b889-49a4-9752-766787fcaeae)
 [![License](https://poser.pugx.org/pugx/shortid-php/license.svg)](https://packagist.org/packages/pugx/shortid-php)
 
-This library is an implementation of [ShortId](https://github.com/dylang/shortid) for PHP.
+This library is an implementation of [ShortId][1] for PHP.
 
-Basic usage
------------
+## Installation
+
+Install the library via Composer:
+
+```bash
+composer require pugx/shortid-php
+```
+
+## Usage
+
+ShortId is a PHP library that generates short, unique, and random strings. It's useful in scenarios
+where you need concise identifiers, such as URL shortening or generating unique keys.
+
+## Basic usage
 
 Just call `PUGX\Shortid\Shortid::generate()` to get a random string with default length 7, like "MfiYIvI".
 
@@ -25,10 +36,9 @@ $id = Shortid::generate();
 
 ```
 
-Advanced usage
---------------
+## Advanced usage
 
-In the following example, you can see how to change the basic alphabet and default length.
+For more control, you can customize the alphabet and length using the Factory class.
 
 Default alphabet uses all letters (lowercase and uppercase), all numbers, underscore, and hypen.
 
@@ -61,12 +71,11 @@ $id5 = Shortid::generate(5);
 
 ```
 
-More readable strings
----------------------
+## More readable strings
 
 Sometimes, you want to avoid some ambiguous characters, like `B`/`8` or `I`/`l` (uppercase/lowercase).
-In this case, you can pass a third parameter `true` to `generate` method. Notice that in this case the alphabet will
-be ignored, so it makes sense to pass a null one.
+In this case, you can pass a third parameter `true` to `generate` method. Notice that in this case the alphabet
+will be ignored, so it makes sense to pass a null one.
 
 Example:
 
@@ -78,8 +87,7 @@ require_once __DIR__.'/vendor/autoload.php';
 $id = Shortid::generate(7, null, true);
 ``` 
 
-Pre-defined values
-------------------
+## Pre-defined values
 
 If you need a deterministic string, instead of a random one, you can call directly the class constructor.
 This could be useful, for instance, when you need pre-defined data for testing purposes.
@@ -94,27 +102,37 @@ $anotherFixedId = new Shortid('fooBarZ');
 
 ```
 
-Doctrine
---------
+## Doctrine
 
-If you want to use ShortId with Doctrine ORM, take a look to
-[ShortId Doctrine type](https://github.com/PUGX/shortid-doctrine).
+If you want to use ShortId with Doctrine ORM, take a look to [ShortId Doctrine type][2].
 
 
-Doctrine and Symfony
---------------------
+## Doctrine and Symfony
 
 If you want to use ShortId with Doctrine ORM and Symfony framework, take a look to
-[ShortId Doctrine type bundle](https://github.com/PUGX/shortid-doctrine-bundle).
+[ShortId Doctrine type bundle][3].
+
+
+## Dependencies replacement
+
+This library uses [a polyfill][4], so it can be used in environments where the mbstring
+native extension is not available.
 
+If, instead, your environment is offering that extension, you can avoid installing
+that polyfill by configuring a [replace][5] entry in your `composer.json`.
 
-mbstring extension
-------------------
+The same applies to the [randomLib][6] library: if you are using PHP 8.3 or higher, 
+you can replace it, since this library uses the native `Random` class instead.
 
-This library uses [a polyfill](https://github.com/symfony/polyfill-mbstring), so it
-can used in environments where mbstring native extension is not available.
+## Contributing
 
-If, instead, your environment is offering such extension, you can avoid installing
-polyfill by configuring [replace](https://getcomposer.org/doc/04-schema.md#replace)
-entry in your `composer.json`.
+Contributions are welcome. Feel free to open a Pull Request or file an issue here on GitHub!
+Please read the [contributing guidelines][7] first.
 
+[1]: https://github.com/dylang/shortid
+[2]: https://github.com/PUGX/shortid-doctrine
+[3]: https://github.com/PUGX/shortid-doctrine-bundle
+[4]: https://github.com/symfony/polyfill-mbstring
+[5]: https://getcomposer.org/doc/04-schema.md#replace
+[6]: https://packagist.org/packages/paragonie/random-lib
+[7]: CONTRIBUTING.md
diff --git a/src/Factory.php b/src/Factory.php
index 352924a..fef6151 100644
--- a/src/Factory.php
+++ b/src/Factory.php
@@ -2,6 +2,7 @@
 
 namespace PUGX\Shortid;
 
+use Random\Randomizer;
 use RandomLib\Factory as RandomLibFactory;
 use RandomLib\Generator;
 
@@ -39,7 +40,11 @@ public function generate(int $length = null, string $alphabet = null, bool $read
             $alphabet .= \str_repeat('_', \strlen(Generator::AMBIGUOUS_CHARS) / 2);
             $alphabet .= \str_repeat('-', \strlen(Generator::AMBIGUOUS_CHARS) / 2);
         }
-        $id = self::getFactory()->getMediumStrengthGenerator()->generateString($length, $alphabet ?? $this->alphabet);
+        if (\PHP_VERSION_ID >= 80300) {
+            $id = (new Randomizer())->getBytesFromString($alphabet ?? $this->alphabet, $length);
+        } else {
+            $id = self::getFactory()->getMediumStrengthGenerator()->generateString($length, $alphabet ?? $this->alphabet);
+        }
 
         return new Shortid($id, $length, $alphabet);
     }
diff --git a/tests/FactoryTest.php b/tests/FactoryTest.php
index 2ea75a7..5e584ed 100644
--- a/tests/FactoryTest.php
+++ b/tests/FactoryTest.php
@@ -22,7 +22,11 @@ public function testGenerate(): void
     {
         $generated = $this->factory->generate();
 
-        self::assertRegExp('/^[a-z0-9\_\-]{7,7}$/i', $generated->__toString());
+        if (\method_exists($this, 'assertMatchesRegularExpression')) {
+            self::assertMatchesRegularExpression('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        } else {
+            self::assertRegExp('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        }
     }
 
     /**
diff --git a/tests/ShortidTest.php b/tests/ShortidTest.php
index b4fd690..35fd53f 100644
--- a/tests/ShortidTest.php
+++ b/tests/ShortidTest.php
@@ -2,7 +2,6 @@
 
 namespace PUGX\Shortid\Test;
 
-use JsonSerializable;
 use PHPUnit\Framework\TestCase;
 use PUGX\Shortid\Factory;
 use PUGX\Shortid\InvalidShortidException;
@@ -19,21 +18,33 @@ public function testGenerate(): void
     {
         $generated = Shortid::generate();
 
-        self::assertRegExp('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        if (\method_exists($this, 'assertMatchesRegularExpression')) {
+            self::assertMatchesRegularExpression('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        } else {
+            self::assertRegExp('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        }
     }
 
     public function testGenerateWithReadable(): void
     {
         $generated = Shortid::generate(null, null, true);
 
-        self::assertRegExp('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        if (\method_exists($this, 'assertMatchesRegularExpression')) {
+            self::assertMatchesRegularExpression('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        } else {
+            self::assertRegExp('/^[a-z0-9\_\-]{7}$/i', $generated->__toString());
+        }
     }
 
     public function testGenerateWithLength(): void
     {
         $generated = Shortid::generate(8);
 
-        self::assertRegExp('/^[a-z0-9\_\-]{8}$/i', $generated->__toString());
+        if (\method_exists($this, 'assertMatchesRegularExpression')) {
+            self::assertMatchesRegularExpression('/^[a-z0-9\_\-]{8}$/i', $generated->__toString());
+        } else {
+            self::assertRegExp('/^[a-z0-9\_\-]{8}$/i', $generated->__toString());
+        }
     }
 
     public function testGetFactory(): void
@@ -75,7 +86,7 @@ public function testJsonSerializable(): void
     {
         $generated = Shortid::generate();
 
-        self::assertInstanceOf(JsonSerializable::class, $generated);
+        self::assertInstanceOf(\JsonSerializable::class, $generated);
     }
 
     public function testJsonEncode(): void