diff --git a/.travis.yml b/.travis.yml
index 2025442..e217a88 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,15 +1,38 @@
 language: php
 
-php:
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - 7.1
+jobs:
+  include:
+    - name: PHP 5.4
+      php: 5.4
+      dist: trusty
+    - name: PHP 5.5
+      php: 5.5
+      dist: trusty
+    - name: PHP 5.6
+      php: 5.6
+      dist: xenial
+    - name: PHP 7.0
+      php: 7.0
+      dist: xenial
+    - name: PHP 7.1
+      php: 7.1
+      dist: bionic
+    - name: PHP 7.2
+      php: 7.2
+      dist: bionic
+    - name: PHP 7.3
+      php: 7.3
+      dist: bionic
+    - name: PHP 7.4
+      php: 7.4
+      dist: bionic
+    - name: PHP 8.0
+      php: 8.0
+      dist: bionic
 
 before_script:
   - composer self-update
-  - composer install --dev --prefer-source
+  - composer install --dev
 
 script: ./vendor/bin/phpunit -c lib/ --coverage-text
 
diff --git a/lib/SmtpValidatorEmail/Helper/ValidatorInitHelper.php b/lib/SmtpValidatorEmail/Helper/ValidatorInitHelper.php
index 69e92da..fa8d619 100644
--- a/lib/SmtpValidatorEmail/Helper/ValidatorInitHelper.php
+++ b/lib/SmtpValidatorEmail/Helper/ValidatorInitHelper.php
@@ -36,11 +36,11 @@ class ValidatorInitHelper{
     protected $options = array();
 
     /**
-     * @param array|String $emails
+     * @param array|string $emails
      * @param $sender
      * @param array $options
      */
-    public function init($emails = array(), $sender, $options = array()) {
+    public function init($emails, $sender, $options = array()) {
         $defaultOptions = array(
             'domainMoreInfo' => false,
             'delaySleep' => array(0),
diff --git a/lib/SmtpValidatorEmail/ValidatorEmail.php b/lib/SmtpValidatorEmail/ValidatorEmail.php
index f8357bc..5e18998 100644
--- a/lib/SmtpValidatorEmail/ValidatorEmail.php
+++ b/lib/SmtpValidatorEmail/ValidatorEmail.php
@@ -48,7 +48,7 @@ class ValidatorEmail extends ValidatorInitHelper
      *                      is invalid, but it might not, depending on your use case, set the
      *                      value appropriately.
      */
-    public function __construct($emails = array(), $sender, $options = array())
+    public function __construct($emails, $sender, $options = array())
     {
         $this->statManager = new StatusManager();
         $this->init($emails,$sender,$options);