diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ecb6293..fc690f2e 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to `laravel-backup` will be documented in this file.
 
+### 3.0.1 - 2016-03-08
+
+- fixed bug in the mail and slack notification senders
+
 ### 3.0.0 - 2016-03-08
 
 Complete rewrite with lots of new features:
diff --git a/src/Notifications/Senders/Mail.php b/src/Notifications/Senders/Mail.php
index 4885bd3f..487aa592 100644
--- a/src/Notifications/Senders/Mail.php
+++ b/src/Notifications/Senders/Mail.php
@@ -2,22 +2,24 @@
 
 namespace Spatie\Backup\Notifications\Senders;
 
+use Illuminate\Contracts\Config\Repository;
+use Illuminate\Contracts\Mail\Mailer;
 use Illuminate\Mail\Message;
 use Spatie\Backup\Notifications\BaseSender;
 
 class Mail extends BaseSender
 {
-    /** @var \Illuminate\Contracts\Mail\Mailer */
+    /** @var Mailer */
     protected $mailer;
 
     /** @var array */
     protected $config;
 
     /**
-     * @param \Illuminate\Contracts\Mail\Mailer       $mailer
-     * @param \Illuminate\Contracts\Config\Repository $config
+     * @param Mailer       $mailer
+     * @param Repository $config
      */
-    public function __construct($mailer, $config)
+    public function __construct(Mailer $mailer, Repository $config)
     {
         $this->config = $config->get('laravel-backup.notifications.mail');
 
diff --git a/src/Notifications/Senders/Slack.php b/src/Notifications/Senders/Slack.php
index fefe812f..6921aa1d 100644
--- a/src/Notifications/Senders/Slack.php
+++ b/src/Notifications/Senders/Slack.php
@@ -2,6 +2,8 @@
 
 namespace Spatie\Backup\Notifications\Senders;
 
+use Illuminate\Contracts\Config\Repository;
+use Maknz\Slack\Client;
 use Spatie\Backup\Notifications\BaseSender;
 
 class Slack extends BaseSender
@@ -14,9 +16,9 @@ class Slack extends BaseSender
 
     /**
      * @param \Maknz\Slack\Client                     $client
-     * @param \Illuminate\Contracts\Config\Repository $config
+     * @param Repository $config
      */
-    public function __construct($client, $config)
+    public function __construct(Client $client, Repository $config)
     {
         $this->config = $config->get('laravel-backup.notifications.slack');