diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05bc868..11601a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.5.2] - 2025-08-08
+### Added
+- Correct `Transaction` `CreditCardExpiry` type.
+
 ## [3.5.1] - 2025-06-11
 ### Added
 - Improve type hinting.
diff --git a/src/AbstractApi.php b/src/AbstractApi.php
index d955154..2620c21 100644
--- a/src/AbstractApi.php
+++ b/src/AbstractApi.php
@@ -55,7 +55,7 @@ abstract class AbstractApi
     /**
      * PHP API version
      */
-    const PHP_API_VERSION = '3.5.1';
+    const PHP_API_VERSION = '3.5.2';
 
     /**
      * Event dispatcher
diff --git a/src/Response/Embeds/Transaction.php b/src/Response/Embeds/Transaction.php
index 4f39146..e356360 100644
--- a/src/Response/Embeds/Transaction.php
+++ b/src/Response/Embeds/Transaction.php
@@ -85,7 +85,7 @@ class Transaction extends AbstractResponse
     public $CardStatus;
 
     /**
-     * @var CreditCard
+     * @var ?CreditCard
      */
     public $CreditCardExpiry;