diff --git a/composer.json b/composer.json
index 2dd872d..b67e9ed 100644
--- a/composer.json
+++ b/composer.json
@@ -1,61 +1,61 @@
 {
-  "name": "wearepixel/laravel-quickbooks",
-  "version": "2.0.0",
-  "description": "Laravel Client for QuickBooks.",
-  "keywords": [
-    "quickbooks",
-    "client",
-    "laravel",
-    "wearepixel"
-  ],
-  "license": "MIT",
-  "authors": [
-    {
-      "name": "Pixel",
-      "email": "hello@wearepixel.com.au"
-    }
-  ],
-  "require": {
-    "php": "^8.3",
-    "illuminate/database": "^10.0|^11.0|^12.0",
-    "illuminate/http": "^10.0|^11.0|^12.0",
-    "illuminate/routing": "^10.0|^11.0|^12.0",
-    "illuminate/support": "^10.0|^11.0|^12.0",
-    "nesbot/carbon": "^2.62.1|^3.0",
-    "quickbooks/v3-php-sdk": "^5.4.6"
-  },
-  "require-dev": {
-    "laravel/pint": "^1.2",
-    "mockery/mockery": "^1.6",
-    "pestphp/pest": "^3.0",
-    "psy/psysh": "^0.12"
-  },
-  "autoload": {
-    "psr-4": {
-      "Wearepixel\\QuickBooks\\": "src/"
-    }
-  },
-  "autoload-dev": {
-    "psr-4": {
-      "Wearepixel\\QuickBooks\\": "tests/"
+    "name": "wearepixel/laravel-quickbooks",
+    "version": "2.0.1",
+    "description": "Laravel Client for QuickBooks.",
+    "keywords": [
+        "quickbooks",
+        "client",
+        "laravel",
+        "wearepixel"
+    ],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Pixel",
+            "email": "hello@wearepixel.com.au"
+        }
+    ],
+    "require": {
+        "php": "^8.3",
+        "illuminate/database": "^10.0|^11.0|^12.0",
+        "illuminate/http": "^10.0|^11.0|^12.0",
+        "illuminate/routing": "^10.0|^11.0|^12.0",
+        "illuminate/support": "^10.0|^11.0|^12.0",
+        "nesbot/carbon": "^2.62.1|^3.0",
+        "quickbooks/v3-php-sdk": "^5.4.6"
     },
-    "files": [
-      "tests/Overrides.php"
-    ]
-  },
-  "extra": {
-    "laravel": {
-      "providers": [
-        "Wearepixel\\QuickBooks\\Providers\\ServiceProvider",
-        "Wearepixel\\QuickBooks\\Providers\\ClientServiceProvider"
-      ]
-    }
-  },
-  "config": {
-    "allow-plugins": {
-      "pestphp/pest-plugin": true
+    "require-dev": {
+        "laravel/pint": "^1.2",
+        "mockery/mockery": "^1.6",
+        "pestphp/pest": "^3.0",
+        "psy/psysh": "^0.12"
     },
-    "sort-packages": true
-  },
-  "prefer-stable": true
+    "autoload": {
+        "psr-4": {
+            "Wearepixel\\QuickBooks\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Wearepixel\\QuickBooks\\": "tests/"
+        },
+        "files": [
+            "tests/Overrides.php"
+        ]
+    },
+    "extra": {
+        "laravel": {
+            "providers": [
+                "Wearepixel\\QuickBooks\\Providers\\ServiceProvider",
+                "Wearepixel\\QuickBooks\\Providers\\ClientServiceProvider"
+            ]
+        }
+    },
+    "config": {
+        "allow-plugins": {
+            "pestphp/pest-plugin": true
+        },
+        "sort-packages": true
+    },
+    "prefer-stable": true
 }
diff --git a/src/Client.php b/src/Client.php
index c18510d..0b88f62 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -181,6 +181,12 @@ public function hasValidRefreshToken(): bool
      *      2) Have valid refresh token, so renew access token & then use
      *      3) No existing token, so need to link account
      *
+     * useJson() is applied in every case: the SDK's default XML deserializer reflects
+     * declared properties on its Data classes and throws when QuickBooks adds a new
+     * response field the installed SDK version doesn't know about yet. The JSON
+     * deserializer builds instances from the class's own properties and silently
+     * ignores unrecognised keys instead, so it tolerates QuickBooks-side schema drift.
+     *
      * @throws SdkException
      * @throws ServiceException
      */
@@ -203,7 +209,7 @@ protected function makeDataService(): DataService
                     'QBORealmID' => $this->token->realm_id,
                     'refreshTokenKey' => $this->token->refresh_token,
                 ]),
-            );
+            )->useJson();
         }
 
         // Have refresh, so update access & allow app to run
@@ -214,7 +220,7 @@ protected function makeDataService(): DataService
                     'QBORealmID' => $this->token->realm_id,
                     'refreshTokenKey' => $this->token->refresh_token,
                 ]),
-            );
+            )->useJson();
 
             $oauth_token = $data_service->getOAuth2LoginHelper()->refreshToken();
 
@@ -226,7 +232,7 @@ protected function makeDataService(): DataService
         }
 
         // Create new...
-        return DataService::Configure($this->parseDataConfigs());
+        return DataService::Configure($this->parseDataConfigs())->useJson();
     }
 
     /**
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index ebd30b4..4110f23 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -1,5 +1,6 @@
 <?php
 
+use QuickBooksOnline\API\Core\Http\Serialization\SerializationFormat;
 use QuickBooksOnline\API\DataService\DataService;
 use QuickBooksOnline\API\Exception\ServiceException;
 use Wearepixel\QuickBooks\Client;
@@ -130,6 +131,27 @@
 it('returns a report service using the data service')
     ->skip('Once we figure out how to test around the static DataService::Configure');
 
+it('configures the data service to use JSON serialization so unrecognised QuickBooks response fields do not throw', function () {
+    $this->token_mock
+        ->shouldReceive('getAttribute')
+        ->twice()
+        ->with('hasValidAccessToken')
+        ->andReturnFalse();
+
+    $this->token_mock
+        ->shouldReceive('getAttribute')
+        ->once()
+        ->with('hasValidRefreshToken')
+        ->andReturnFalse();
+
+    $format = $this->client
+        ->getDataService()
+        ->getServiceContext()
+        ->IppConfiguration->Message->Request->SerializationFormat;
+
+    expect($format)->toBe(SerializationFormat::Json);
+});
+
 it('has logging off by default')
     ->skip('Have to figure out how to test this with the new code in 5.x');