diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09793cf7..5076d48e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@ All notable changes to `katanox-php` will be documented in this file.
 
 Updates should follow the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
 
+## [3.2.0] - 2021-10-11
+### Changed
+- The expiry year should now be a 4 digit number
+
+## [3.1.1] - 2021-09-29
+### Changed
+- Resource url is now a variable instead of const
+
 ## [3.1.0] - 2021-09-29
 ### Bugfix
 - Include parameters of AvailabilityQuery are now used as expected in query string
diff --git a/src/Katanox/Model/Booking/Payment.php b/src/Katanox/Model/Booking/Payment.php
index 2eba3fcb..947404f3 100644
--- a/src/Katanox/Model/Booking/Payment.php
+++ b/src/Katanox/Model/Booking/Payment.php
@@ -103,7 +103,7 @@ public function getExpiryMonth(): string
     /**
      * @throws InvalidArgumentException
      */
-    public function setExpirtyMonth(string $expiryMonth): Payment
+    public function setExpiryMonth(string $expiryMonth): Payment
     {
         if (2 !== strlen($expiryMonth)) {
             throw new InvalidArgumentException('Invalid expiry month.  Format must be: xx');
@@ -118,8 +118,8 @@ public function setExpirtyMonth(string $expiryMonth): Payment
      */
     public function setExpiryYear(string $expiryYear): Payment
     {
-        if (2 !== strlen($expiryYear)) {
-            throw new InvalidArgumentException('Invalid expiry year.  Format must be: xx');
+        if (4 !== strlen($expiryYear)) {
+            throw new InvalidArgumentException('Invalid expiry year.  Format must be: xxxx');
         }
         $this->expiry_year = $expiryYear;
 
diff --git a/tests/Katanox/ModelTest.php b/tests/Katanox/ModelTest.php
index 7eb32150..d4bb87a8 100644
--- a/tests/Katanox/ModelTest.php
+++ b/tests/Katanox/ModelTest.php
@@ -291,7 +291,7 @@ public function testBookingToArray()
                 'cvv' => '111',
                 'card_holder' => 'Holder',
                 'expiry_month' => '08',
-                'expiry_year' => '22',
+                'expiry_year' => '2022',
             ],
         ];
 
@@ -329,8 +329,8 @@ private function createPayment()
         $payment->setCardHolder('Holder');
         $payment->setCVV('111');
         $payment->setType('VISA');
-        $payment->setExpirtyMonth('08');
-        $payment->setExpiryYear('22');
+        $payment->setExpiryMonth('08');
+        $payment->setExpiryYear('2022');
         $payment->setCardNumber('11111111111111111111');
 
         return $payment;
diff --git a/tests/Katanox/Resource/BookingResourceTest.php b/tests/Katanox/Resource/BookingResourceTest.php
index 800c84c9..4f9dd8cb 100644
--- a/tests/Katanox/Resource/BookingResourceTest.php
+++ b/tests/Katanox/Resource/BookingResourceTest.php
@@ -101,7 +101,7 @@ public function testSuccesfulCreateBooking()
                         'cvv' => '111',
                         'card_holder' => 'Holder',
                         'expiry_month' => '08',
-                        'expiry_year' => '22',
+                        'expiry_year' => '2022',
                     ],
                 ],
                 ['Content-Type' => 'application/json']
@@ -188,7 +188,7 @@ public function testCreateBookingUnsuccesfulResponse()
                         'cvv' => '111',
                         'card_holder' => 'Holder',
                         'expiry_month' => '08',
-                        'expiry_year' => '22',
+                        'expiry_year' => '2022',
                     ],
                 ],
                 ['Content-Type' => 'application/json']
@@ -581,8 +581,8 @@ private function createPayment()
         $payment->setCardHolder('Holder')
             ->setCVV('111')
             ->setType('VISA')
-            ->setExpirtyMonth('08')
-            ->setExpiryYear('22')
+            ->setExpiryMonth('08')
+            ->setExpiryYear('2022')
             ->setCardNumber('11111111111111111111')
         ;