diff --git a/Sieve.php b/Sieve.php
index 57dac39..e7237bc 100644
--- a/Sieve.php
+++ b/Sieve.php
@@ -94,7 +94,7 @@ class Net_Sieve
      *
      * @var array
      */
-    var $supportedAuthMethods = array(
+    var $supportedAuthMethods = [
         'DIGEST-MD5',
         'CRAM-MD5',
         'EXTERNAL',
@@ -103,14 +103,14 @@ class Net_Sieve
         'GSSAPI',
         'XOAUTH2',
         'OAUTHBEARER'
-    );
+    ];
 
     /**
      * SASL authentication methods that require Auth_SASL.
      *
      * @var array
      */
-    var $supportedSASLAuthMethods = array('DIGEST-MD5', 'CRAM-MD5');
+    var $supportedSASLAuthMethods = ['DIGEST-MD5', 'CRAM-MD5'];
 
     /**
      * The socket handle.
@@ -131,7 +131,7 @@ class Net_Sieve
      *
      * @var array
      */
-    var $_capability = array();
+    var $_capability = [];
 
     /**
      * Current state of the connection.
@@ -1055,7 +1055,7 @@ function _cmdListScripts()
             return $res;
         }
 
-        $scripts = array();
+        $scripts = [];
         $activescript = null;
         $res = explode("\r\n", $res);
         foreach ($res as $value) {
@@ -1068,7 +1068,7 @@ function _cmdListScripts()
             }
         }
 
-        return array($scripts, $activescript);
+        return [$scripts, $activescript];
     }
 
     /**
@@ -1157,7 +1157,7 @@ function _cmdCapability()
     function _parseCapability($data)
     {
         // Clear the cached capabilities.
-        $this->_capability = array('sasl' => array(), 'extensions' => array());
+        $this->_capability = ['sasl' => [], 'extensions' => []];
 
         $data = preg_split('/\r?\n/', $this->_toUpper($data), -1, PREG_SPLIT_NO_EMPTY);
 
@@ -1535,7 +1535,7 @@ function _debug($message)
     {
         if ($this->_debug) {
             if ($this->_debug_handler) {
-                call_user_func_array($this->_debug_handler, array(&$this, $message));
+                call_user_func_array($this->_debug_handler, [$this, $message]);
             } else {
                 echo "$message\n";
             }
diff --git a/composer.json b/composer.json
index f4e8af7..2737856 100644
--- a/composer.json
+++ b/composer.json
@@ -40,6 +40,7 @@
     },
     "type": "library",
     "require": {
+        "php": ">=5.6.0",
         "pear/pear-core-minimal": "~1.10",
         "pear/net_socket": "~1.2"
     },
diff --git a/package.xml b/package.xml
index 08e9ccd..aafedd1 100644
--- a/package.xml
+++ b/package.xml
@@ -65,7 +65,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
  <dependencies>
   <required>
    <php>
-    <min>5.0.0</min>
+    <min>5.6.0</min>
    </php>
    <pearinstaller>
     <min>1.4.0b1</min>
diff --git a/tests/SieveTest.php b/tests/SieveTest.php
index 58e4bbe..ea7294c 100644
--- a/tests/SieveTest.php
+++ b/tests/SieveTest.php
@@ -67,19 +67,20 @@ protected function setUp(): void
         // Create a new instance of Net_Sieve.
         $this->_pear = new PEAR();
         $this->fixture = new Net_Sieve();
-        $this->scripts = array(
+        $this->scripts = [
             'test script1' => "require \"fileinto\";\r\nif header :contains \"From\" \"@cnba.uba.ar\" \r\n{fileinto \"INBOX.Test1\";}\r\nelse \r\n{fileinto \"INBOX\";}",
             'test script2' => "require \"fileinto\";\r\nif header :contains \"From\" \"@cnba.uba.ar\" \r\n{fileinto \"INBOX.Test\";}\r\nelse \r\n{fileinto \"INBOX\";}",
             'test"scriptäöü3' => "require \"vacation\";\nvacation\n:days 7\n:addresses [\"matthew@de-construct.com\"]\n:subject \"This is a test\"\n\"I'm on my holiday!\nsadfafs\";",
-            'test script4' => file_get_contents(dirname(__FILE__) . '/largescript.siv'));
+            'test script4' => file_get_contents(dirname(__FILE__) . '/largescript.siv'),
+        ];
     }
-    
+
     protected function tearDown(): void
     {
         // Delete the instance.
         unset($this->fixture);
     }
-    
+
     protected function login()
     {
         $result = $this->fixture->connect(HOST, PORT);