diff --git a/hmrc-gateway-message.php b/hmrc-gateway-message.php
index da6ecd6..485ec26 100644
--- a/hmrc-gateway-message.php
+++ b/hmrc-gateway-message.php
@@ -8,7 +8,7 @@ class hmrc_gateway_message extends check {
 		private $message_function = NULL;
 		private $message_transation = NULL;
 		private $message_correlation = NULL;
-		private $message_keys = array();
+		private $message_keys = [];
 		private $vendor_code = NULL;
 		private $vendor_name = NULL;
 		private $sender_name = NULL;
diff --git a/hmrc-gateway.php b/hmrc-gateway.php
index 9835107..754f7fc 100644
--- a/hmrc-gateway.php
+++ b/hmrc-gateway.php
@@ -149,7 +149,7 @@ public function request_list($message_class) {
 			//--------------------------------------------------
 			// Extract requests
 
-				$requests = array();
+				$requests = [];
 
 				if (isset($this->response_object->Body->StatusReport)) {
 					foreach ($this->response_object->Body->StatusReport->StatusRecord as $request) {
@@ -226,7 +226,7 @@ public function request_poll($request) {
 
 				} else if ($this->response_qualifier == 'response') {
 
-					$details = array();
+					$details = [];
 					if ($this->request_ref) {
 						$details = $this->request_ref->response_details($this->response_object);
 					}
diff --git a/hmrc-rti-eas.php b/hmrc-rti-eas.php
index 8c6e585..593f0b6 100644
--- a/hmrc-rti-eas.php
+++ b/hmrc-rti-eas.php
@@ -2,7 +2,7 @@
 
 	class hmrc_rti_eas extends hmrc_rti { // Employer Alignment Submission
 
-		private $employees = array();
+		private $employees = [];
 
 		public function message_class_get() {
 			return 'HMRC-PAYE-RTI-EAS';
diff --git a/hmrc-rti-eps.php b/hmrc-rti-eps.php
index df22e21..c4f0c30 100644
--- a/hmrc-rti-eps.php
+++ b/hmrc-rti-eps.php
@@ -2,7 +2,7 @@
 
 	class hmrc_rti_eps extends hmrc_rti { // Employer Payment Summary - Send an EPS instead of an FPS if you've not paid any employees in a tax month.
 
-		private $employees = array();
+		private $employees = [];
 
 		public function message_class_get() {
 			return 'HMRC-PAYE-RTI-EPS';
diff --git a/hmrc-rti-fps.php b/hmrc-rti-fps.php
index 6fc8f24..f0ac393 100644
--- a/hmrc-rti-fps.php
+++ b/hmrc-rti-fps.php
@@ -2,7 +2,7 @@
 
 	class hmrc_rti_fps extends hmrc_rti { // Full Payment Submission
 
-		private $employees = array();
+		private $employees = [];
 
 		public function message_class_get() {
 			return 'HMRC-PAYE-RTI-FPS';
diff --git a/hmrc-rti.php b/hmrc-rti.php
index e9720cb..1b5fdf4 100644
--- a/hmrc-rti.php
+++ b/hmrc-rti.php
@@ -2,7 +2,7 @@
 
 	class hmrc_rti extends check {
 
-		protected $details = array();
+		protected $details = [];
 
 		public function details_set($details) {
 
@@ -51,7 +51,7 @@ public function request_header_get_xml() {
 
 		public function response_details($response_object) {
 
-			return array();
+			return [];
 
 		}
 
diff --git a/hmrc-vat.php b/hmrc-vat.php
index ffe0bcf..2671754 100644
--- a/hmrc-vat.php
+++ b/hmrc-vat.php
@@ -2,7 +2,7 @@
 
 	class hmrc_vat extends check {
 
-		protected $details = array();
+		protected $details = [];
 
 		public function details_set($details) {