diff --git a/composer.json b/composer.json
index b67e9ed..85be75b 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "wearepixel/laravel-quickbooks",
-    "version": "2.0.1",
+    "version": "2.0.2",
     "description": "Laravel Client for QuickBooks.",
     "keywords": [
         "quickbooks",
@@ -22,7 +22,7 @@
         "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"
+        "quickbooks/v3-php-sdk": "^6.3.1"
     },
     "require-dev": {
         "laravel/pint": "^1.2",
diff --git a/src/Client.php b/src/Client.php
index 0b88f62..c18510d 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -181,12 +181,6 @@ 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
      */
@@ -209,7 +203,7 @@ protected function makeDataService(): DataService
                     'QBORealmID' => $this->token->realm_id,
                     'refreshTokenKey' => $this->token->refresh_token,
                 ]),
-            )->useJson();
+            );
         }
 
         // Have refresh, so update access & allow app to run
@@ -220,7 +214,7 @@ protected function makeDataService(): DataService
                     'QBORealmID' => $this->token->realm_id,
                     'refreshTokenKey' => $this->token->refresh_token,
                 ]),
-            )->useJson();
+            );
 
             $oauth_token = $data_service->getOAuth2LoginHelper()->refreshToken();
 
@@ -232,7 +226,7 @@ protected function makeDataService(): DataService
         }
 
         // Create new...
-        return DataService::Configure($this->parseDataConfigs())->useJson();
+        return DataService::Configure($this->parseDataConfigs());
     }
 
     /**
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index 4110f23..ebd30b4 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -1,6 +1,5 @@
 <?php
 
-use QuickBooksOnline\API\Core\Http\Serialization\SerializationFormat;
 use QuickBooksOnline\API\DataService\DataService;
 use QuickBooksOnline\API\Exception\ServiceException;
 use Wearepixel\QuickBooks\Client;
@@ -131,27 +130,6 @@
 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');