diff --git a/.github/workflows/setup-di-compile.yml b/.github/workflows/setup-di-compile.yml
index d30c9d4..41e20f8 100644
--- a/.github/workflows/setup-di-compile.yml
+++ b/.github/workflows/setup-di-compile.yml
@@ -1,5 +1,5 @@
 name: Run setup:upgrade and setup:di:compile
-on: [ pull_request ]
+on: [pull_request]
 
 jobs:
   build:
@@ -7,8 +7,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - PHP_VERSION: php81-fpm
-            MAGENTO_VERSION: 2.4.5-p11
           - PHP_VERSION: php82-fpm
             MAGENTO_VERSION: 2.4.6
     runs-on: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8bf3bd5..f6f6559 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ 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).
 
+## [v2.4.3] - 2026-07-03
+
+### Changed
+
+- Switch to json serialization for cache adapter
+
 ## [v2.4.2] - 2025-03-20
 
 ### Fixed
diff --git a/Service/Cache/Psr16CacheAdapter.php b/Service/Cache/Psr16CacheAdapter.php
index c46138e..584476a 100644
--- a/Service/Cache/Psr16CacheAdapter.php
+++ b/Service/Cache/Psr16CacheAdapter.php
@@ -26,7 +26,12 @@ public function get($key, $default = null): mixed
             return $default;
         }
 
-        return unserialize($item);
+        $decoded = json_decode($item, true);
+        if (json_last_error() === JSON_ERROR_NONE) {
+            return $decoded;
+        }
+
+        return $default;
     }
 
     /**
@@ -34,9 +39,8 @@ public function get($key, $default = null): mixed
      */
     public function set($key, $value, $ttl = null): bool
     {
-        $value = serialize($value);
         return $this->cacheFrontend->save(
-            $value,
+            json_encode($value),
             $key,
             [CacheType::CACHE_TAG],
             $ttl
diff --git a/etc/config.xml b/etc/config.xml
index 9be13cb..648ece2 100644
--- a/etc/config.xml
+++ b/etc/config.xml
@@ -10,7 +10,7 @@
     <default>
         <payment>
             <truelayer>
-                <version>2.4.2</version>
+                <version>2.4.3</version>
                 <model>TrueLayerFacade</model>
                 <title>TrueLayer</title>
                 <description>Make a direct payment securely from your bank app - no card needed</description>