diff --git a/.travis.yml b/.travis.yml
index 37f5119..a165347 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,12 +3,12 @@ language: php
 dist: trusty
 
 php:
-  - 7.1.3
+  - 7.2
 
 matrix:
   fast_finish: true
   allow_failures:
-    - php: 7.1.3
+    - php: 7.2
 
 before_script:
   - travis_retry composer self-update
diff --git a/composer.json b/composer.json
index 31d2bc2..a8592a2 100644
--- a/composer.json
+++ b/composer.json
@@ -11,14 +11,14 @@
     }],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=7.1.3",
-        "illuminate/support": "~5.0",
-        "illuminate/cache": "~5.0"
+        "php": "^7.2",
+        "illuminate/support": "~6.0",
+        "illuminate/cache": "~6.0"
     },
     "require-dev": {
-        "orchestra/database": "~3.8.0",
-        "orchestra/testbench": "~3.8.0",
-        "phpunit/phpunit": "~7.0"
+        "orchestra/database": "^4.0",
+        "orchestra/testbench": "^4.0",
+        "phpunit/phpunit": "~8.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/database/factories/ModelFactory.php b/database/factories/ModelFactory.php
index 05ae286..4593ad0 100644
--- a/database/factories/ModelFactory.php
+++ b/database/factories/ModelFactory.php
@@ -12,6 +12,9 @@
 */
 
 /** @var \Illuminate\Database\Eloquent\Factory $factory */
+
+use Illuminate\Support\Str;
+
 $factory->define( \HttpOz\Roles\Tests\Stubs\User::class, function ( Faker\Generator $faker ) {
 	static $password;
 
@@ -19,7 +22,7 @@
 		'name'           => $faker->name,
 		'email'          => $faker->unique()->safeEmail,
 		'password'       => $password ?: $password = bcrypt( 'secret' ),
-		'remember_token' => str_random( 10 ),
+		'remember_token' => Str::random( 10 ),
 	];
 } );
 
diff --git a/readme.md b/readme.md
index dde8bf9..01712d7 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,4 @@
-# Roles for Laravel 5.3 to 5.8
+# Roles for Laravel 5 / 6
 Powerful package for handling roles in Laravel
 
 [![Build Status](https://travis-ci.org/httpoz/roles.svg)](https://travis-ci.org/httpoz/roles)
@@ -15,10 +15,11 @@ Powerful package for handling roles in Laravel
 | 5.5.*  | [Roles 3.0.x](https://github.com/httpoz/roles/tree/3.0) |
 | 5.6.*  | [Roles 3.1.x](https://github.com/httpoz/roles/tree/v3.1.0) |
 | 5.7.*  | [Roles 3.2.x](https://github.com/httpoz/roles/tree/3.2.0) |
-| 5.8.*  | Roles 3.3.x
+| 5.8.*  | [Roles 3.3.x](https://github.com/httpoz/roles/tree/3.3.0) |
+| 6.x  | Roles 4.x
 
 #### History
-This project was largely inspired by Roman's [romanbican/roles](https://github.com/romanbican/roles/) Laravel package. However at the time Laravel 5.3 was released his package was not actively maintained. I have ommitted permissions in this package in favour of Laravel's [Authorization](https://laravel.com/docs/5.3/authorization). I intend to keep this package as simple and minimal as is possible.
+This project was largely inspired by Roman's [romanbican/roles](https://github.com/romanbican/roles/) Laravel package. However at the time Laravel 5.3 was released his package was not actively maintained. I have ommitted permissions in this package in favour of Laravel's [Authorization](https://laravel.com/docs/6.x/authorization). I intend to keep this package as simple and minimal as is possible.
 
 - [Installation](#installation)
     - [Composer](#composer)
@@ -43,7 +44,7 @@ This package is very easy to set up. There are only couple of steps.
 ### Composer
 Add the package to your project via composer.
 ```bash
-composer require httpoz/roles:~v3.3.0
+composer require httpoz/roles:^v4.0
 ```
 
 ### Config File And Migrations
diff --git a/src/Traits/HasRole.php b/src/Traits/HasRole.php
index 5a40728..301b04f 100644
--- a/src/Traits/HasRole.php
+++ b/src/Traits/HasRole.php
@@ -235,8 +235,8 @@ private function getArrayFrom( $argument ) {
 	 * @return mixed
 	 */
 	public function __call( $method, $parameters ) {
-		if ( starts_with( $method, 'is' ) ) {
-			return $this->isRole( snake_case( substr( $method, 2 ), config( 'roles.separator' ) ) );
+		if ( Str::startsWith( $method, 'is' ) ) {
+			return $this->isRole( Str::snake( substr( $method, 2 ), config( 'roles.separator' ) ) );
 		}
 
 		return parent::__call( $method, $parameters );
diff --git a/src/Traits/Sluggable.php b/src/Traits/Sluggable.php
index 4edc607..91e3845 100644
--- a/src/Traits/Sluggable.php
+++ b/src/Traits/Sluggable.php
@@ -2,6 +2,8 @@
 
 namespace HttpOz\Roles\Traits;
 
+use Illuminate\Support\Str;
+
 trait Sluggable
 {
     /**
@@ -13,12 +15,12 @@ trait Sluggable
 
     public function setSlugAttribute($value)
     {
-        $this->attributes['slug'] = str_slug($value, config('roles.separator'));
+        $this->attributes['slug'] = Str::slug($value, config('roles.separator'));
     }
 
     public function setGroupAttribute($value)
     {
-        $this->attributes['group'] = str_slug($value, config('roles.separator'));
+        $this->attributes['group'] = Str::slug($value, config('roles.separator'));
     }
 
 }