diff --git a/manifest.json b/manifest.json
index cfad299a7..2836438c6 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
     "variables": {
-        "${LATEST}": "3.366.4"
+        "${LATEST}": "3.367.1"
     },
     "endpoints": "https://raw.githubusercontent.com/aws/aws-sdk-php/${LATEST}/src/data/endpoints.json",
     "services": {
diff --git a/src/CodeGenerator/src/Generator/ResponseParser/RestJsonParser.php b/src/CodeGenerator/src/Generator/ResponseParser/RestJsonParser.php
index 4bf86e25f..23df950b7 100644
--- a/src/CodeGenerator/src/Generator/ResponseParser/RestJsonParser.php
+++ b/src/CodeGenerator/src/Generator/ResponseParser/RestJsonParser.php
@@ -105,9 +105,6 @@ public function generate(StructureShape $shape, bool $throwOnError = true): Pars
         }
 
         $body = '$data = $response->toArray(' . ($throwOnError ? '' : 'false') . ');' . "\n";
-        if (null !== $wrapper = $shape->getResultWrapper()) {
-            $body .= strtr('$data = $data[WRAPPER];' . "\n", ['WRAPPER' => var_export($wrapper, true)]);
-        }
         $body .= "\n" . implode("\n", $properties);
 
         return new ParserResult($body, $this->imports, $this->functions);
diff --git a/src/Service/CloudWatch/CHANGELOG.md b/src/Service/CloudWatch/CHANGELOG.md
index 3115035eb..07f25e03c 100644
--- a/src/Service/CloudWatch/CHANGELOG.md
+++ b/src/Service/CloudWatch/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 - AWS api-change: Added `us-isob-west-1` region
 - AWS api-change: Added `eusc-de-east-1` region
+- AWS api-change: This release switch to the AWS JSON 1.1 Procol, replacing the currently utilized one, AWSQuery.
 
 ### Dependency bumped
 
diff --git a/src/Service/CloudWatch/composer.json b/src/Service/CloudWatch/composer.json
index c5125da6c..a429f7485 100644
--- a/src/Service/CloudWatch/composer.json
+++ b/src/Service/CloudWatch/composer.json
@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": "^8.2",
-        "ext-simplexml": "*",
+        "ext-json": "*",
         "async-aws/core": "^1.9"
     },
     "require-dev": {
diff --git a/src/Service/CloudWatch/src/CloudWatchClient.php b/src/Service/CloudWatch/src/CloudWatchClient.php
index 5647ec74d..b7f1a9012 100644
--- a/src/Service/CloudWatch/src/CloudWatchClient.php
+++ b/src/Service/CloudWatch/src/CloudWatchClient.php
@@ -26,7 +26,7 @@
 use AsyncAws\CloudWatch\ValueObject\MetricDatum;
 use AsyncAws\Core\AbstractApi;
 use AsyncAws\Core\AwsError\AwsErrorFactoryInterface;
-use AsyncAws\Core\AwsError\XmlAwsErrorFactory;
+use AsyncAws\Core\AwsError\JsonRpcAwsErrorFactory;
 use AsyncAws\Core\Configuration;
 use AsyncAws\Core\RequestContext;
 use AsyncAws\Core\Result;
@@ -314,7 +314,7 @@ public function putMetricData($input): Result
 
     protected function getAwsErrorFactory(): AwsErrorFactoryInterface
     {
-        return new XmlAwsErrorFactory();
+        return new JsonRpcAwsErrorFactory();
     }
 
     protected function getEndpointMetadata(?string $region): array
diff --git a/src/Service/CloudWatch/src/Input/GetMetricDataInput.php b/src/Service/CloudWatch/src/Input/GetMetricDataInput.php
index 588973e3c..2b181d9db 100644
--- a/src/Service/CloudWatch/src/Input/GetMetricDataInput.php
+++ b/src/Service/CloudWatch/src/Input/GetMetricDataInput.php
@@ -192,7 +192,11 @@ public function getStartTime(): ?\DateTimeImmutable
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/x-www-form-urlencoded'];
+        $headers = [
+            'Content-Type' => 'application/x-amz-json-1.0',
+            'X-Amz-Target' => 'GraniteServiceVersion20100801.GetMetricData',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
@@ -201,7 +205,8 @@ public function request(): Request
         $uriString = '/';
 
         // Prepare Body
-        $body = http_build_query(['Action' => 'GetMetricData', 'Version' => '2010-08-01'] + $this->requestBody(), '', '&', \PHP_QUERY_RFC1738);
+        $bodyPayload = $this->requestBody();
+        $body = empty($bodyPayload) ? '{}' : json_encode($bodyPayload, 4194304);
 
         // Return the Request
         return new Request('POST', $uriString, $query, $headers, StreamFactory::create($body));
@@ -269,22 +274,21 @@ private function requestBody(): array
             throw new InvalidArgument(\sprintf('Missing parameter "MetricDataQueries" for "%s". The value cannot be null.', __CLASS__));
         }
 
-        $index = 0;
-        foreach ($v as $mapValue) {
+        $index = -1;
+        $payload['MetricDataQueries'] = [];
+        foreach ($v as $listValue) {
             ++$index;
-            foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                $payload["MetricDataQueries.member.$index.$bodyKey"] = $bodyValue;
-            }
+            $payload['MetricDataQueries'][$index] = $listValue->requestBody();
         }
 
         if (null === $v = $this->startTime) {
             throw new InvalidArgument(\sprintf('Missing parameter "StartTime" for "%s". The value cannot be null.', __CLASS__));
         }
-        $payload['StartTime'] = $v->format(\DateTimeInterface::ATOM);
+        $payload['StartTime'] = $v->getTimestamp();
         if (null === $v = $this->endTime) {
             throw new InvalidArgument(\sprintf('Missing parameter "EndTime" for "%s". The value cannot be null.', __CLASS__));
         }
-        $payload['EndTime'] = $v->format(\DateTimeInterface::ATOM);
+        $payload['EndTime'] = $v->getTimestamp();
         if (null !== $v = $this->nextToken) {
             $payload['NextToken'] = $v;
         }
@@ -298,9 +302,7 @@ private function requestBody(): array
             $payload['MaxDatapoints'] = $v;
         }
         if (null !== $v = $this->labelOptions) {
-            foreach ($v->requestBody() as $bodyKey => $bodyValue) {
-                $payload["LabelOptions.$bodyKey"] = $bodyValue;
-            }
+            $payload['LabelOptions'] = $v->requestBody();
         }
 
         return $payload;
diff --git a/src/Service/CloudWatch/src/Input/GetMetricStatisticsInput.php b/src/Service/CloudWatch/src/Input/GetMetricStatisticsInput.php
index 729ef5aec..29b4d074a 100644
--- a/src/Service/CloudWatch/src/Input/GetMetricStatisticsInput.php
+++ b/src/Service/CloudWatch/src/Input/GetMetricStatisticsInput.php
@@ -240,7 +240,11 @@ public function getUnit(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/x-www-form-urlencoded'];
+        $headers = [
+            'Content-Type' => 'application/x-amz-json-1.0',
+            'X-Amz-Target' => 'GraniteServiceVersion20100801.GetMetricStatistics',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
@@ -249,7 +253,8 @@ public function request(): Request
         $uriString = '/';
 
         // Prepare Body
-        $body = http_build_query(['Action' => 'GetMetricStatistics', 'Version' => '2010-08-01'] + $this->requestBody(), '', '&', \PHP_QUERY_RFC1738);
+        $bodyPayload = $this->requestBody();
+        $body = empty($bodyPayload) ? '{}' : json_encode($bodyPayload, 4194304);
 
         // Return the Request
         return new Request('POST', $uriString, $query, $headers, StreamFactory::create($body));
@@ -342,41 +347,42 @@ private function requestBody(): array
         }
         $payload['MetricName'] = $v;
         if (null !== $v = $this->dimensions) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Dimensions'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["Dimensions.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['Dimensions'][$index] = $listValue->requestBody();
             }
         }
         if (null === $v = $this->startTime) {
             throw new InvalidArgument(\sprintf('Missing parameter "StartTime" for "%s". The value cannot be null.', __CLASS__));
         }
-        $payload['StartTime'] = $v->format(\DateTimeInterface::ATOM);
+        $payload['StartTime'] = $v->getTimestamp();
         if (null === $v = $this->endTime) {
             throw new InvalidArgument(\sprintf('Missing parameter "EndTime" for "%s". The value cannot be null.', __CLASS__));
         }
-        $payload['EndTime'] = $v->format(\DateTimeInterface::ATOM);
+        $payload['EndTime'] = $v->getTimestamp();
         if (null === $v = $this->period) {
             throw new InvalidArgument(\sprintf('Missing parameter "Period" for "%s". The value cannot be null.', __CLASS__));
         }
         $payload['Period'] = $v;
         if (null !== $v = $this->statistics) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Statistics'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                if (!Statistic::exists($mapValue)) {
-                    throw new InvalidArgument(\sprintf('Invalid parameter "Statistics.member" for "%s". The value "%s" is not a valid "Statistic".', __CLASS__, $mapValue));
+                if (!Statistic::exists($listValue)) {
+                    throw new InvalidArgument(\sprintf('Invalid parameter "Statistics" for "%s". The value "%s" is not a valid "Statistic".', __CLASS__, $listValue));
                 }
-                $payload["Statistics.member.$index"] = $mapValue;
+                $payload['Statistics'][$index] = $listValue;
             }
         }
         if (null !== $v = $this->extendedStatistics) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['ExtendedStatistics'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                $payload["ExtendedStatistics.member.$index"] = $mapValue;
+                $payload['ExtendedStatistics'][$index] = $listValue;
             }
         }
         if (null !== $v = $this->unit) {
diff --git a/src/Service/CloudWatch/src/Input/ListMetricsInput.php b/src/Service/CloudWatch/src/Input/ListMetricsInput.php
index ae9b8f966..886ee2caa 100644
--- a/src/Service/CloudWatch/src/Input/ListMetricsInput.php
+++ b/src/Service/CloudWatch/src/Input/ListMetricsInput.php
@@ -158,7 +158,11 @@ public function getRecentlyActive(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/x-www-form-urlencoded'];
+        $headers = [
+            'Content-Type' => 'application/x-amz-json-1.0',
+            'X-Amz-Target' => 'GraniteServiceVersion20100801.ListMetrics',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
@@ -167,7 +171,8 @@ public function request(): Request
         $uriString = '/';
 
         // Prepare Body
-        $body = http_build_query(['Action' => 'ListMetrics', 'Version' => '2010-08-01'] + $this->requestBody(), '', '&', \PHP_QUERY_RFC1738);
+        $bodyPayload = $this->requestBody();
+        $body = empty($bodyPayload) ? '{}' : json_encode($bodyPayload, 4194304);
 
         // Return the Request
         return new Request('POST', $uriString, $query, $headers, StreamFactory::create($body));
@@ -238,12 +243,11 @@ private function requestBody(): array
             $payload['MetricName'] = $v;
         }
         if (null !== $v = $this->dimensions) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Dimensions'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["Dimensions.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['Dimensions'][$index] = $listValue->requestBody();
             }
         }
         if (null !== $v = $this->nextToken) {
@@ -256,7 +260,7 @@ private function requestBody(): array
             $payload['RecentlyActive'] = $v;
         }
         if (null !== $v = $this->includeLinkedAccounts) {
-            $payload['IncludeLinkedAccounts'] = $v ? 'true' : 'false';
+            $payload['IncludeLinkedAccounts'] = (bool) $v;
         }
         if (null !== $v = $this->owningAccount) {
             $payload['OwningAccount'] = $v;
diff --git a/src/Service/CloudWatch/src/Input/PutMetricDataInput.php b/src/Service/CloudWatch/src/Input/PutMetricDataInput.php
index 94916ee7f..720281ae0 100644
--- a/src/Service/CloudWatch/src/Input/PutMetricDataInput.php
+++ b/src/Service/CloudWatch/src/Input/PutMetricDataInput.php
@@ -140,7 +140,11 @@ public function getStrictEntityValidation(): ?bool
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/x-www-form-urlencoded'];
+        $headers = [
+            'Content-Type' => 'application/x-amz-json-1.0',
+            'X-Amz-Target' => 'GraniteServiceVersion20100801.PutMetricData',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
@@ -149,7 +153,8 @@ public function request(): Request
         $uriString = '/';
 
         // Prepare Body
-        $body = http_build_query(['Action' => 'PutMetricData', 'Version' => '2010-08-01'] + $this->requestBody(), '', '&', \PHP_QUERY_RFC1738);
+        $bodyPayload = $this->requestBody();
+        $body = empty($bodyPayload) ? '{}' : json_encode($bodyPayload, 4194304);
 
         // Return the Request
         return new Request('POST', $uriString, $query, $headers, StreamFactory::create($body));
@@ -197,25 +202,23 @@ private function requestBody(): array
         }
         $payload['Namespace'] = $v;
         if (null !== $v = $this->metricData) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['MetricData'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["MetricData.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['MetricData'][$index] = $listValue->requestBody();
             }
         }
         if (null !== $v = $this->entityMetricData) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['EntityMetricData'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["EntityMetricData.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['EntityMetricData'][$index] = $listValue->requestBody();
             }
         }
         if (null !== $v = $this->strictEntityValidation) {
-            $payload['StrictEntityValidation'] = $v ? 'true' : 'false';
+            $payload['StrictEntityValidation'] = (bool) $v;
         }
 
         return $payload;
diff --git a/src/Service/CloudWatch/src/Result/GetMetricDataOutput.php b/src/Service/CloudWatch/src/Result/GetMetricDataOutput.php
index e3367c5f2..da4ad78f3 100644
--- a/src/Service/CloudWatch/src/Result/GetMetricDataOutput.php
+++ b/src/Service/CloudWatch/src/Result/GetMetricDataOutput.php
@@ -176,54 +176,56 @@ public function getNextToken(): ?string
 
     protected function populateResult(Response $response): void
     {
-        $data = new \SimpleXMLElement($response->getContent());
-        $data = $data->GetMetricDataResult;
+        $data = $response->toArray();
 
-        $this->metricDataResults = (0 === ($v = $data->MetricDataResults)->count()) ? [] : $this->populateResultMetricDataResults($v);
-        $this->nextToken = (null !== $v = $data->NextToken[0]) ? (string) $v : null;
-        $this->messages = (0 === ($v = $data->Messages)->count()) ? [] : $this->populateResultMetricDataResultMessages($v);
+        $this->metricDataResults = empty($data['MetricDataResults']) ? [] : $this->populateResultMetricDataResults($data['MetricDataResults']);
+        $this->nextToken = isset($data['NextToken']) ? (string) $data['NextToken'] : null;
+        $this->messages = empty($data['Messages']) ? [] : $this->populateResultMetricDataResultMessages($data['Messages']);
     }
 
     /**
      * @return float[]
      */
-    private function populateResultDatapointValues(\SimpleXMLElement $xml): array
+    private function populateResultDatapointValues(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
-            $items[] = (float) (string) $item;
+        foreach ($json as $item) {
+            $a = isset($item) ? (float) $item : null;
+            if (null !== $a) {
+                $items[] = $a;
+            }
         }
 
         return $items;
     }
 
-    private function populateResultMessageData(\SimpleXMLElement $xml): MessageData
+    private function populateResultMessageData(array $json): MessageData
     {
         return new MessageData([
-            'Code' => (null !== $v = $xml->Code[0]) ? (string) $v : null,
-            'Value' => (null !== $v = $xml->Value[0]) ? (string) $v : null,
+            'Code' => isset($json['Code']) ? (string) $json['Code'] : null,
+            'Value' => isset($json['Value']) ? (string) $json['Value'] : null,
         ]);
     }
 
-    private function populateResultMetricDataResult(\SimpleXMLElement $xml): MetricDataResult
+    private function populateResultMetricDataResult(array $json): MetricDataResult
     {
         return new MetricDataResult([
-            'Id' => (null !== $v = $xml->Id[0]) ? (string) $v : null,
-            'Label' => (null !== $v = $xml->Label[0]) ? (string) $v : null,
-            'Timestamps' => (0 === ($v = $xml->Timestamps)->count()) ? null : $this->populateResultTimestamps($v),
-            'Values' => (0 === ($v = $xml->Values)->count()) ? null : $this->populateResultDatapointValues($v),
-            'StatusCode' => (null !== $v = $xml->StatusCode[0]) ? (string) $v : null,
-            'Messages' => (0 === ($v = $xml->Messages)->count()) ? null : $this->populateResultMetricDataResultMessages($v),
+            'Id' => isset($json['Id']) ? (string) $json['Id'] : null,
+            'Label' => isset($json['Label']) ? (string) $json['Label'] : null,
+            'Timestamps' => !isset($json['Timestamps']) ? null : $this->populateResultTimestamps($json['Timestamps']),
+            'Values' => !isset($json['Values']) ? null : $this->populateResultDatapointValues($json['Values']),
+            'StatusCode' => isset($json['StatusCode']) ? (string) $json['StatusCode'] : null,
+            'Messages' => !isset($json['Messages']) ? null : $this->populateResultMetricDataResultMessages($json['Messages']),
         ]);
     }
 
     /**
      * @return MessageData[]
      */
-    private function populateResultMetricDataResultMessages(\SimpleXMLElement $xml): array
+    private function populateResultMetricDataResultMessages(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
+        foreach ($json as $item) {
             $items[] = $this->populateResultMessageData($item);
         }
 
@@ -233,10 +235,10 @@ private function populateResultMetricDataResultMessages(\SimpleXMLElement $xml):
     /**
      * @return MetricDataResult[]
      */
-    private function populateResultMetricDataResults(\SimpleXMLElement $xml): array
+    private function populateResultMetricDataResults(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
+        foreach ($json as $item) {
             $items[] = $this->populateResultMetricDataResult($item);
         }
 
@@ -246,11 +248,14 @@ private function populateResultMetricDataResults(\SimpleXMLElement $xml): array
     /**
      * @return \DateTimeImmutable[]
      */
-    private function populateResultTimestamps(\SimpleXMLElement $xml): array
+    private function populateResultTimestamps(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
-            $items[] = new \DateTimeImmutable((string) $item);
+        foreach ($json as $item) {
+            $a = (isset($item) && ($d = \DateTimeImmutable::createFromFormat('U.u', \sprintf('%.6F', $item)))) ? $d : null;
+            if (null !== $a) {
+                $items[] = $a;
+            }
         }
 
         return $items;
diff --git a/src/Service/CloudWatch/src/Result/GetMetricStatisticsOutput.php b/src/Service/CloudWatch/src/Result/GetMetricStatisticsOutput.php
index dbc5340cd..a3a47937a 100644
--- a/src/Service/CloudWatch/src/Result/GetMetricStatisticsOutput.php
+++ b/src/Service/CloudWatch/src/Result/GetMetricStatisticsOutput.php
@@ -41,36 +41,34 @@ public function getLabel(): ?string
 
     protected function populateResult(Response $response): void
     {
-        $data = new \SimpleXMLElement($response->getContent());
-        $data = $data->GetMetricStatisticsResult;
+        $data = $response->toArray();
 
-        $this->label = (null !== $v = $data->Label[0]) ? (string) $v : null;
-        $this->datapoints = (0 === ($v = $data->Datapoints)->count()) ? [] : $this->populateResultDatapoints($v);
+        $this->label = isset($data['Label']) ? (string) $data['Label'] : null;
+        $this->datapoints = empty($data['Datapoints']) ? [] : $this->populateResultDatapoints($data['Datapoints']);
     }
 
-    private function populateResultDatapoint(\SimpleXMLElement $xml): Datapoint
+    private function populateResultDatapoint(array $json): Datapoint
     {
         return new Datapoint([
-            'Timestamp' => (null !== $v = $xml->Timestamp[0]) ? new \DateTimeImmutable((string) $v) : null,
-            'SampleCount' => (null !== $v = $xml->SampleCount[0]) ? (float) (string) $v : null,
-            'Average' => (null !== $v = $xml->Average[0]) ? (float) (string) $v : null,
-            'Sum' => (null !== $v = $xml->Sum[0]) ? (float) (string) $v : null,
-            'Minimum' => (null !== $v = $xml->Minimum[0]) ? (float) (string) $v : null,
-            'Maximum' => (null !== $v = $xml->Maximum[0]) ? (float) (string) $v : null,
-            'Unit' => (null !== $v = $xml->Unit[0]) ? (string) $v : null,
-            'ExtendedStatistics' => (0 === ($v = $xml->ExtendedStatistics)->count()) ? null : $this->populateResultDatapointValueMap($v),
+            'Timestamp' => (isset($json['Timestamp']) && ($d = \DateTimeImmutable::createFromFormat('U.u', \sprintf('%.6F', $json['Timestamp'])))) ? $d : null,
+            'SampleCount' => isset($json['SampleCount']) ? (float) $json['SampleCount'] : null,
+            'Average' => isset($json['Average']) ? (float) $json['Average'] : null,
+            'Sum' => isset($json['Sum']) ? (float) $json['Sum'] : null,
+            'Minimum' => isset($json['Minimum']) ? (float) $json['Minimum'] : null,
+            'Maximum' => isset($json['Maximum']) ? (float) $json['Maximum'] : null,
+            'Unit' => isset($json['Unit']) ? (string) $json['Unit'] : null,
+            'ExtendedStatistics' => !isset($json['ExtendedStatistics']) ? null : $this->populateResultDatapointValueMap($json['ExtendedStatistics']),
         ]);
     }
 
     /**
      * @return array<string, float>
      */
-    private function populateResultDatapointValueMap(\SimpleXMLElement $xml): array
+    private function populateResultDatapointValueMap(array $json): array
     {
         $items = [];
-        foreach ($xml->entry as $item) {
-            $a = $item->value;
-            $items[$item->key->__toString()] = (float) (string) $a;
+        foreach ($json as $name => $value) {
+            $items[(string) $name] = (float) $value;
         }
 
         return $items;
@@ -79,10 +77,10 @@ private function populateResultDatapointValueMap(\SimpleXMLElement $xml): array
     /**
      * @return Datapoint[]
      */
-    private function populateResultDatapoints(\SimpleXMLElement $xml): array
+    private function populateResultDatapoints(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
+        foreach ($json as $item) {
             $items[] = $this->populateResultDatapoint($item);
         }
 
diff --git a/src/Service/CloudWatch/src/Result/ListMetricsOutput.php b/src/Service/CloudWatch/src/Result/ListMetricsOutput.php
index 3672a36af..6b836a777 100644
--- a/src/Service/CloudWatch/src/Result/ListMetricsOutput.php
+++ b/src/Service/CloudWatch/src/Result/ListMetricsOutput.php
@@ -174,51 +174,50 @@ public function getOwningAccounts(bool $currentPageOnly = false): iterable
 
     protected function populateResult(Response $response): void
     {
-        $data = new \SimpleXMLElement($response->getContent());
-        $data = $data->ListMetricsResult;
+        $data = $response->toArray();
 
-        $this->metrics = (0 === ($v = $data->Metrics)->count()) ? [] : $this->populateResultMetrics($v);
-        $this->nextToken = (null !== $v = $data->NextToken[0]) ? (string) $v : null;
-        $this->owningAccounts = (0 === ($v = $data->OwningAccounts)->count()) ? [] : $this->populateResultOwningAccounts($v);
+        $this->metrics = empty($data['Metrics']) ? [] : $this->populateResultMetrics($data['Metrics']);
+        $this->nextToken = isset($data['NextToken']) ? (string) $data['NextToken'] : null;
+        $this->owningAccounts = empty($data['OwningAccounts']) ? [] : $this->populateResultOwningAccounts($data['OwningAccounts']);
     }
 
-    private function populateResultDimension(\SimpleXMLElement $xml): Dimension
+    private function populateResultDimension(array $json): Dimension
     {
         return new Dimension([
-            'Name' => (string) $xml->Name,
-            'Value' => (string) $xml->Value,
+            'Name' => (string) $json['Name'],
+            'Value' => (string) $json['Value'],
         ]);
     }
 
     /**
      * @return Dimension[]
      */
-    private function populateResultDimensions(\SimpleXMLElement $xml): array
+    private function populateResultDimensions(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
+        foreach ($json as $item) {
             $items[] = $this->populateResultDimension($item);
         }
 
         return $items;
     }
 
-    private function populateResultMetric(\SimpleXMLElement $xml): Metric
+    private function populateResultMetric(array $json): Metric
     {
         return new Metric([
-            'Namespace' => (null !== $v = $xml->Namespace[0]) ? (string) $v : null,
-            'MetricName' => (null !== $v = $xml->MetricName[0]) ? (string) $v : null,
-            'Dimensions' => (0 === ($v = $xml->Dimensions)->count()) ? null : $this->populateResultDimensions($v),
+            'Namespace' => isset($json['Namespace']) ? (string) $json['Namespace'] : null,
+            'MetricName' => isset($json['MetricName']) ? (string) $json['MetricName'] : null,
+            'Dimensions' => !isset($json['Dimensions']) ? null : $this->populateResultDimensions($json['Dimensions']),
         ]);
     }
 
     /**
      * @return Metric[]
      */
-    private function populateResultMetrics(\SimpleXMLElement $xml): array
+    private function populateResultMetrics(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
+        foreach ($json as $item) {
             $items[] = $this->populateResultMetric($item);
         }
 
@@ -228,11 +227,14 @@ private function populateResultMetrics(\SimpleXMLElement $xml): array
     /**
      * @return string[]
      */
-    private function populateResultOwningAccounts(\SimpleXMLElement $xml): array
+    private function populateResultOwningAccounts(array $json): array
     {
         $items = [];
-        foreach ($xml->member as $item) {
-            $items[] = (string) $item;
+        foreach ($json as $item) {
+            $a = isset($item) ? (string) $item : null;
+            if (null !== $a) {
+                $items[] = $a;
+            }
         }
 
         return $items;
diff --git a/src/Service/CloudWatch/src/ValueObject/Entity.php b/src/Service/CloudWatch/src/ValueObject/Entity.php
index b942ca4ca..fb92839bf 100644
--- a/src/Service/CloudWatch/src/ValueObject/Entity.php
+++ b/src/Service/CloudWatch/src/ValueObject/Entity.php
@@ -84,19 +84,23 @@ public function requestBody(): array
     {
         $payload = [];
         if (null !== $v = $this->keyAttributes) {
-            $index = 0;
-            foreach ($v as $mapKey => $mapValue) {
-                ++$index;
-                $payload["KeyAttributes.entry.$index.key"] = $mapKey;
-                $payload["KeyAttributes.entry.$index.value"] = $mapValue;
+            if (empty($v)) {
+                $payload['KeyAttributes'] = new \stdClass();
+            } else {
+                $payload['KeyAttributes'] = [];
+                foreach ($v as $name => $mv) {
+                    $payload['KeyAttributes'][$name] = $mv;
+                }
             }
         }
         if (null !== $v = $this->attributes) {
-            $index = 0;
-            foreach ($v as $mapKey => $mapValue) {
-                ++$index;
-                $payload["Attributes.entry.$index.key"] = $mapKey;
-                $payload["Attributes.entry.$index.value"] = $mapValue;
+            if (empty($v)) {
+                $payload['Attributes'] = new \stdClass();
+            } else {
+                $payload['Attributes'] = [];
+                foreach ($v as $name => $mv) {
+                    $payload['Attributes'][$name] = $mv;
+                }
             }
         }
 
diff --git a/src/Service/CloudWatch/src/ValueObject/EntityMetricData.php b/src/Service/CloudWatch/src/ValueObject/EntityMetricData.php
index 0ba31b558..f3cccd993 100644
--- a/src/Service/CloudWatch/src/ValueObject/EntityMetricData.php
+++ b/src/Service/CloudWatch/src/ValueObject/EntityMetricData.php
@@ -65,17 +65,14 @@ public function requestBody(): array
     {
         $payload = [];
         if (null !== $v = $this->entity) {
-            foreach ($v->requestBody() as $bodyKey => $bodyValue) {
-                $payload["Entity.$bodyKey"] = $bodyValue;
-            }
+            $payload['Entity'] = $v->requestBody();
         }
         if (null !== $v = $this->metricData) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['MetricData'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["MetricData.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['MetricData'][$index] = $listValue->requestBody();
             }
         }
 
diff --git a/src/Service/CloudWatch/src/ValueObject/Metric.php b/src/Service/CloudWatch/src/ValueObject/Metric.php
index d217cd5f3..faf6c47a0 100644
--- a/src/Service/CloudWatch/src/ValueObject/Metric.php
+++ b/src/Service/CloudWatch/src/ValueObject/Metric.php
@@ -85,12 +85,11 @@ public function requestBody(): array
             $payload['MetricName'] = $v;
         }
         if (null !== $v = $this->dimensions) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Dimensions'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["Dimensions.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['Dimensions'][$index] = $listValue->requestBody();
             }
         }
 
diff --git a/src/Service/CloudWatch/src/ValueObject/MetricDataQuery.php b/src/Service/CloudWatch/src/ValueObject/MetricDataQuery.php
index 5176538ab..9e39283b6 100644
--- a/src/Service/CloudWatch/src/ValueObject/MetricDataQuery.php
+++ b/src/Service/CloudWatch/src/ValueObject/MetricDataQuery.php
@@ -200,9 +200,7 @@ public function requestBody(): array
         $v = $this->id;
         $payload['Id'] = $v;
         if (null !== $v = $this->metricStat) {
-            foreach ($v->requestBody() as $bodyKey => $bodyValue) {
-                $payload["MetricStat.$bodyKey"] = $bodyValue;
-            }
+            $payload['MetricStat'] = $v->requestBody();
         }
         if (null !== $v = $this->expression) {
             $payload['Expression'] = $v;
@@ -211,7 +209,7 @@ public function requestBody(): array
             $payload['Label'] = $v;
         }
         if (null !== $v = $this->returnData) {
-            $payload['ReturnData'] = $v ? 'true' : 'false';
+            $payload['ReturnData'] = (bool) $v;
         }
         if (null !== $v = $this->period) {
             $payload['Period'] = $v;
diff --git a/src/Service/CloudWatch/src/ValueObject/MetricDatum.php b/src/Service/CloudWatch/src/ValueObject/MetricDatum.php
index 269d99a1c..87fba8de3 100644
--- a/src/Service/CloudWatch/src/ValueObject/MetricDatum.php
+++ b/src/Service/CloudWatch/src/ValueObject/MetricDatum.php
@@ -209,37 +209,36 @@ public function requestBody(): array
         $v = $this->metricName;
         $payload['MetricName'] = $v;
         if (null !== $v = $this->dimensions) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Dimensions'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                foreach ($mapValue->requestBody() as $bodyKey => $bodyValue) {
-                    $payload["Dimensions.member.$index.$bodyKey"] = $bodyValue;
-                }
+                $payload['Dimensions'][$index] = $listValue->requestBody();
             }
         }
         if (null !== $v = $this->timestamp) {
-            $payload['Timestamp'] = $v->format(\DateTimeInterface::ATOM);
+            $payload['Timestamp'] = $v->getTimestamp();
         }
         if (null !== $v = $this->value) {
             $payload['Value'] = $v;
         }
         if (null !== $v = $this->statisticValues) {
-            foreach ($v->requestBody() as $bodyKey => $bodyValue) {
-                $payload["StatisticValues.$bodyKey"] = $bodyValue;
-            }
+            $payload['StatisticValues'] = $v->requestBody();
         }
         if (null !== $v = $this->values) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Values'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                $payload["Values.member.$index"] = $mapValue;
+                $payload['Values'][$index] = $listValue;
             }
         }
         if (null !== $v = $this->counts) {
-            $index = 0;
-            foreach ($v as $mapValue) {
+            $index = -1;
+            $payload['Counts'] = [];
+            foreach ($v as $listValue) {
                 ++$index;
-                $payload["Counts.member.$index"] = $mapValue;
+                $payload['Counts'][$index] = $listValue;
             }
         }
         if (null !== $v = $this->unit) {
diff --git a/src/Service/CloudWatch/src/ValueObject/MetricStat.php b/src/Service/CloudWatch/src/ValueObject/MetricStat.php
index bfd92b25e..1d35b8511 100644
--- a/src/Service/CloudWatch/src/ValueObject/MetricStat.php
+++ b/src/Service/CloudWatch/src/ValueObject/MetricStat.php
@@ -112,10 +112,7 @@ public function requestBody(): array
     {
         $payload = [];
         $v = $this->metric;
-        foreach ($v->requestBody() as $bodyKey => $bodyValue) {
-            $payload["Metric.$bodyKey"] = $bodyValue;
-        }
-
+        $payload['Metric'] = $v->requestBody();
         $v = $this->period;
         $payload['Period'] = $v;
         $v = $this->stat;
diff --git a/src/Service/CloudWatch/tests/Unit/Input/GetMetricDataInputTest.php b/src/Service/CloudWatch/tests/Unit/Input/GetMetricDataInputTest.php
index 788686990..d398f7cbd 100644
--- a/src/Service/CloudWatch/tests/Unit/Input/GetMetricDataInputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Input/GetMetricDataInputTest.php
@@ -2,10 +2,8 @@
 
 namespace AsyncAws\CloudWatch\Tests\Unit\Input;
 
-use AsyncAws\CloudWatch\Enum\ScanBy;
 use AsyncAws\CloudWatch\Input\GetMetricDataInput;
 use AsyncAws\CloudWatch\ValueObject\Dimension;
-use AsyncAws\CloudWatch\ValueObject\LabelOptions;
 use AsyncAws\CloudWatch\ValueObject\Metric;
 use AsyncAws\CloudWatch\ValueObject\MetricDataQuery;
 use AsyncAws\CloudWatch\ValueObject\MetricStat;
@@ -17,59 +15,74 @@ public function testRequest(): void
     {
         $input = new GetMetricDataInput([
             'MetricDataQueries' => [new MetricDataQuery([
-                'Id' => 'change me',
+                'Id' => 'q1',
+                'Expression' => 'SELECT AVG(CPUUtilization) FROM SCHEMA("AWS/EC2", InstanceId)',
+                'Label' => 'Cluster CpuUtilization',
+                'Period' => 300,
+            ]), new MetricDataQuery([
+                'Id' => 'm1',
+                'Label' => 'Unhealthy Behind Load Balancer',
                 'MetricStat' => new MetricStat([
                     'Metric' => new Metric([
-                        'Namespace' => 'foo',
-                        'MetricName' => 'bar',
+                        'Namespace' => 'AWS/ApplicationELB',
+                        'MetricName' => 'UnHealthyHostCount',
                         'Dimensions' => [new Dimension([
-                            'Name' => 'bar',
-                            'Value' => '123',
+                            'Name' => 'TargetGroup',
+                            'Value' => 'targetgroup/EC2Co-Defau-EXAMPLEWNAD/89cc68152b367e5f',
+                        ]), new Dimension([
+                            'Name' => 'LoadBalancer',
+                            'Value' => 'app/EC2Co-EcsEl-EXAMPLE69Q/fdd2210e799e4376',
                         ])],
                     ]),
-                    'Period' => 1337,
+                    'Period' => 300,
                     'Stat' => 'Average',
                 ]),
-                'Expression' => 'change me',
-                'Label' => 'hello world',
-                'ReturnData' => false,
-                'Period' => 1337,
             ])],
-            'StartTime' => new \DateTimeImmutable('2021-08-28T06:10:58+00:00'),
-            'EndTime' => new \DateTimeImmutable('2021-08-29T06:10:58+00:00'),
-            'NextToken' => 'change me',
-            'ScanBy' => ScanBy::TIMESTAMP_ASCENDING,
-            'MaxDatapoints' => 1337,
-            'LabelOptions' => new LabelOptions([
-                'Timezone' => 'change me',
-            ]),
+            'StartTime' => new \DateTimeImmutable('2021-11-16T11:25:00+00:00'),
+            'EndTime' => new \DateTimeImmutable('2021-11-16T14:55:00+00:00'),
         ]);
 
         // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_GetMetricData.html
         $expected = '
             POST / HTTP/1.0
-            Content-Type: application/x-www-form-urlencoded
+            Content-Type: application/x-amz-json-1.0
+            x-amz-target: GraniteServiceVersion20100801.GetMetricData
+            accept: application/json
 
-            Action=GetMetricData&
-            Version=2010-08-01&
-            MetricDataQueries.member.1.Id=change+me&
-            MetricDataQueries.member.1.MetricStat.Metric.Namespace=foo&
-            MetricDataQueries.member.1.MetricStat.Metric.MetricName=bar&
-            MetricDataQueries.member.1.MetricStat.Metric.Dimensions.member.1.Name=bar&
-            MetricDataQueries.member.1.MetricStat.Metric.Dimensions.member.1.Value=123&
-            MetricDataQueries.member.1.MetricStat.Period=1337&
-            MetricDataQueries.member.1.MetricStat.Stat=Average&
-            MetricDataQueries.member.1.Expression=change+me&
-            MetricDataQueries.member.1.Label=hello+world&
-            MetricDataQueries.member.1.ReturnData=false&
-            MetricDataQueries.member.1.Period=1337&
-            StartTime=2021-08-28T06%3A10%3A58%2B00%3A00&
-            EndTime=2021-08-29T06%3A10%3A58%2B00%3A00&
-            NextToken=change+me&
-            ScanBy=TimestampAscending&
-            MaxDatapoints=1337&
-            LabelOptions.Timezone=change+me
-                ';
+            {
+                "StartTime": 1637061900,
+                "EndTime": 1637074500,
+                "MetricDataQueries": [
+                    {
+                        "Expression": "SELECT AVG(CPUUtilization) FROM SCHEMA(\"AWS/EC2\", InstanceId)",
+                        "Id": "q1",
+                        "Period": 300,
+                        "Label": "Cluster CpuUtilization"
+                    },
+                    {
+                        "Id": "m1",
+                        "Label": "Unhealthy Behind Load Balancer",
+                        "MetricStat": {
+                            "Metric": {
+                                "Namespace": "AWS/ApplicationELB",
+                                "MetricName": "UnHealthyHostCount",
+                                "Dimensions": [
+                                    {
+                                        "Name": "TargetGroup",
+                                        "Value": "targetgroup/EC2Co-Defau-EXAMPLEWNAD/89cc68152b367e5f"
+                                    },
+                                    {
+                                        "Name": "LoadBalancer",
+                                        "Value": "app/EC2Co-EcsEl-EXAMPLE69Q/fdd2210e799e4376"
+                                    }
+                                ]
+                            },
+                            "Period": 300,
+                            "Stat": "Average"
+                        }
+                    }
+                ]
+            }';
 
         self::assertRequestEqualsHttpRequest($expected, $input->request());
     }
diff --git a/src/Service/CloudWatch/tests/Unit/Input/GetMetricStatisticsInputTest.php b/src/Service/CloudWatch/tests/Unit/Input/GetMetricStatisticsInputTest.php
index 22a53a40e..ed80039a2 100644
--- a/src/Service/CloudWatch/tests/Unit/Input/GetMetricStatisticsInputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Input/GetMetricStatisticsInputTest.php
@@ -27,19 +27,26 @@ public function testRequest(): void
         // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_GetMetricStatistics.html
         $expected = '
             POST / HTTP/1.0
-            Content-Type: application/x-www-form-urlencoded
+            Content-Type: application/x-amz-json-1.0
+            x-amz-target: GraniteServiceVersion20100801.GetMetricStatistics
+            accept: application/json
 
-            Action=GetMetricStatistics&
-            Version=2010-08-01&
-            Namespace=foo&
-            MetricName=bar&
-            Dimensions.member.1.Name=bar&
-            Dimensions.member.1.Value=123&
-            StartTime=2021-08-28T06%3A10%3A58%2B00%3A00&
-            EndTime=2021-08-29T06%3A10%3A58%2B00%3A00&
-            Period=1337&
-            Statistics.member.1=Minimum
-                ';
+            {
+                "Dimensions": [
+                    {
+                        "Name": "bar",
+                        "Value": "123"
+                    }
+                ],
+                "EndTime": 1630217458,
+                "MetricName": "bar",
+                "Namespace": "foo",
+                "Period": 1337,
+                "StartTime": 1630131058,
+                "Statistics": [
+                    "Minimum"
+                ]
+            }';
 
         self::assertRequestEqualsHttpRequest($expected, $input->request());
     }
diff --git a/src/Service/CloudWatch/tests/Unit/Input/ListMetricsInputTest.php b/src/Service/CloudWatch/tests/Unit/Input/ListMetricsInputTest.php
index 098293991..fd933638e 100644
--- a/src/Service/CloudWatch/tests/Unit/Input/ListMetricsInputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Input/ListMetricsInputTest.php
@@ -25,17 +25,22 @@ public function testRequest(): void
         // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_ListMetrics.html
         $expected = '
             POST / HTTP/1.0
-            Content-Type: application/x-www-form-urlencoded
+            Content-Type: application/x-amz-json-1.0
+            x-amz-target: GraniteServiceVersion20100801.ListMetrics
+            accept: application/json
 
-            Action=ListMetrics&
-            Version=2010-08-01&
-            Namespace=foo&
-            MetricName=bar&
-            Dimensions.member.1.Name=bar&
-            Dimensions.member.1.Value=123&
-            NextToken=change+me&
-            RecentlyActive=PT3H
-                ';
+            {
+                "Dimensions": [
+                    {
+                        "Name": "bar",
+                        "Value": "123"
+                    }
+                ],
+                "MetricName": "bar",
+                "Namespace": "foo",
+                "NextToken": "change me",
+                "RecentlyActive": "PT3H"
+            }';
 
         self::assertRequestEqualsHttpRequest($expected, $input->request());
     }
diff --git a/src/Service/CloudWatch/tests/Unit/Input/PutMetricDataInputTest.php b/src/Service/CloudWatch/tests/Unit/Input/PutMetricDataInputTest.php
index f51854c81..729cc2652 100644
--- a/src/Service/CloudWatch/tests/Unit/Input/PutMetricDataInputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Input/PutMetricDataInputTest.php
@@ -37,24 +37,39 @@ public function testRequest(): void
         // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricData.html
         $expected = '
             POST / HTTP/1.0
-            Content-Type: application/x-www-form-urlencoded
+            Content-Type: application/x-amz-json-1.0
+            x-amz-target: GraniteServiceVersion20100801.PutMetricData
+            accept: application/json
 
-            Action=PutMetricData&
-            Version=2010-08-01&
-            Namespace=foo&
-            MetricData.member.1.MetricName=bar&
-            MetricData.member.1.Dimensions.member.1.Name=bar&
-            MetricData.member.1.Dimensions.member.1.Value=123&
-            MetricData.member.1.Timestamp=2021-08-28T06%3A05%3A55%2B00%3A00&
-            MetricData.member.1.Value=1337&
-            MetricData.member.1.StatisticValues.SampleCount=1337&
-            MetricData.member.1.StatisticValues.Sum=1337&
-            MetricData.member.1.StatisticValues.Minimum=1337&
-            MetricData.member.1.StatisticValues.Maximum=1337&
-            MetricData.member.1.Values.member.1=1337&
-            MetricData.member.1.Counts.member.1=1337&
-            MetricData.member.1.StorageResolution=1337
-                ';
+            {
+                "MetricData": [
+                    {
+                        "Counts": [
+                            1337
+                        ],
+                        "Dimensions": [
+                            {
+                                "Name": "bar",
+                                "Value": "123"
+                            }
+                        ],
+                        "MetricName": "bar",
+                        "StatisticValues": {
+                            "Maximum": 1337,
+                            "Minimum": 1337,
+                            "SampleCount": 1337,
+                            "Sum": 1337
+                        },
+                        "StorageResolution": 1337,
+                        "Timestamp": 1630130755,
+                        "Value": 1337,
+                        "Values": [
+                            1337
+                        ]
+                    }
+                ],
+                "Namespace": "foo"
+            }';
 
         self::assertRequestEqualsHttpRequest($expected, $input->request());
     }
diff --git a/src/Service/CloudWatch/tests/Unit/Result/GetMetricDataOutputTest.php b/src/Service/CloudWatch/tests/Unit/Result/GetMetricDataOutputTest.php
index eece3c457..dd8aa7d3c 100644
--- a/src/Service/CloudWatch/tests/Unit/Result/GetMetricDataOutputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Result/GetMetricDataOutputTest.php
@@ -15,14 +15,49 @@ class GetMetricDataOutputTest extends TestCase
 {
     public function testGetMetricDataOutput(): void
     {
-        // see https://docs.aws.amazon.com/cloudwatch/latest/APIReference/API_GetMetricData.html
-        $response = new SimpleMockedResponse('<Result><GetMetricDataResult><NextToken>foobar</NextToken></GetMetricDataResult></Result>');
+        // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_GetMetricData.html
+        $response = new SimpleMockedResponse('{
+            "MetricDataResults": [
+                {
+                    "Id": "m1",
+                    "Label": "Unhealthy Behind Load Balancer",
+                    "StatusCode": "Complete",
+                    "Timestamps": [
+                        1637074200,
+                        1637073900,
+                        1637073600
+                    ],
+                    "Values": [
+                        0,
+                        0,
+                        0
+                    ]
+                },
+                {
+                    "Id": "q1",
+                    "Label": "Cluster CpuUtilization",
+                    "StatusCode": "Complete",
+                    "Timestamps": [
+                        1637074245,
+                        1637073945,
+                        1637073645
+                    ],
+                    "Values": [
+                        1.2158469945359334,
+                        0.8678863271635757,
+                        0.7201860957623283
+                    ]
+                }
+            ]
+        }');
 
         $client = new MockHttpClient($response);
         $result = new GetMetricDataOutput(new Response($client->request('POST', 'http://localhost'), $client, new NullLogger()), new CloudWatchClient(), new GetMetricDataInput([]));
 
-        // self::assertTODO(expected, $result->getMetricDataResults());
-        self::assertSame('foobar', $result->getNextToken());
-        // self::assertTODO(expected, $result->getMessages());
+        $metricDataResults = [...$result->getMetricDataResults(true)];
+        self::assertCount(2, $metricDataResults);
+        self::assertSame('m1', $metricDataResults[0]->getId());
+        self::assertCount(3, $metricDataResults[0]->getTimestamps());
+        self::assertSame('2021-11-16T14:45:00+00:00', $metricDataResults[0]->getTimestamps()[1]->format(\DATE_ATOM));
     }
 }
diff --git a/src/Service/CloudWatch/tests/Unit/Result/GetMetricStatisticsOutputTest.php b/src/Service/CloudWatch/tests/Unit/Result/GetMetricStatisticsOutputTest.php
index 8b8d0d224..3d943058a 100644
--- a/src/Service/CloudWatch/tests/Unit/Result/GetMetricStatisticsOutputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Result/GetMetricStatisticsOutputTest.php
@@ -14,11 +14,12 @@ class GetMetricStatisticsOutputTest extends TestCase
     public function testGetMetricStatisticsOutput(): void
     {
         // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_GetMetricStatistics.html
-        $response = new SimpleMockedResponse('<Result><GetMetricStatisticsResult><Label>foobar</Label></GetMetricStatisticsResult></Result>');
+        $response = new SimpleMockedResponse('{
+            "Label": "foobar"
+        }');
 
         $client = new MockHttpClient($response);
         $result = new GetMetricStatisticsOutput(new Response($client->request('POST', 'http://localhost'), $client, new NullLogger()));
-
         self::assertSame('foobar', $result->getLabel());
     }
 }
diff --git a/src/Service/CloudWatch/tests/Unit/Result/ListMetricsOutputTest.php b/src/Service/CloudWatch/tests/Unit/Result/ListMetricsOutputTest.php
index fc1e3deee..52953cb5b 100644
--- a/src/Service/CloudWatch/tests/Unit/Result/ListMetricsOutputTest.php
+++ b/src/Service/CloudWatch/tests/Unit/Result/ListMetricsOutputTest.php
@@ -16,7 +16,9 @@ class ListMetricsOutputTest extends TestCase
     public function testListMetricsOutput(): void
     {
         // see https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_ListMetrics.html
-        $response = new SimpleMockedResponse('<Result><ListMetricsResult><NextToken>foobar</NextToken></ListMetricsResult></Result>');
+        $response = new SimpleMockedResponse('{
+                "NextToken": "foobar"
+        }');
 
         $client = new MockHttpClient($response);
         $result = new ListMetricsOutput(new Response($client->request('POST', 'http://localhost'), $client, new NullLogger()), new CloudWatchClient(), new ListMetricsInput([]));
diff --git a/src/Service/Lambda/CHANGELOG.md b/src/Service/Lambda/CHANGELOG.md
index c783b549d..454892f10 100644
--- a/src/Service/Lambda/CHANGELOG.md
+++ b/src/Service/Lambda/CHANGELOG.md
@@ -13,6 +13,7 @@
 - AWS api-change: Launching Lambda Managed Instances - a new feature to run Lambda on EC2.
 - AWS api-change: Add DisallowedByVpcEncryptionControl to the LastUpdateStatusReasonCode and StateReasonCode enums to represent failures caused by VPC Encryption Controls.
 - AWS api-change: Added `eusc-de-east-1` region
+- AWS api-change: Add Dotnet 10 (dotnet10) support to AWS Lambda.
 
 ### Dependency bumped
 
diff --git a/src/Service/Lambda/src/Enum/Runtime.php b/src/Service/Lambda/src/Enum/Runtime.php
index b5997cea7..4394b5200 100644
--- a/src/Service/Lambda/src/Enum/Runtime.php
+++ b/src/Service/Lambda/src/Enum/Runtime.php
@@ -8,6 +8,7 @@ final class Runtime
     public const DOTNETCORE_2_0 = 'dotnetcore2.0';
     public const DOTNETCORE_2_1 = 'dotnetcore2.1';
     public const DOTNETCORE_3_1 = 'dotnetcore3.1';
+    public const DOTNET_10 = 'dotnet10';
     public const DOTNET_6 = 'dotnet6';
     public const DOTNET_8 = 'dotnet8';
     public const GO_1_X = 'go1.x';
@@ -56,6 +57,7 @@ public static function exists(string $value): bool
             self::DOTNETCORE_2_0 => true,
             self::DOTNETCORE_2_1 => true,
             self::DOTNETCORE_3_1 => true,
+            self::DOTNET_10 => true,
             self::DOTNET_6 => true,
             self::DOTNET_8 => true,
             self::GO_1_X => true,
diff --git a/src/Service/SecretsManager/CHANGELOG.md b/src/Service/SecretsManager/CHANGELOG.md
index 10300a249..7c51e8b6c 100644
--- a/src/Service/SecretsManager/CHANGELOG.md
+++ b/src/Service/SecretsManager/CHANGELOG.md
@@ -7,6 +7,7 @@
 - AWS api-change: Added `us-isob-west-1` region
 - AWS api-change: Adds support to create, update, retrieve, rotate, and delete managed external secrets.
 - AWS api-change: Added `eusc-de-east-1` region
+- AWS api-change: Add SortBy parameter to ListSecrets
 
 ### Dependency bumped
 
diff --git a/src/Service/SecretsManager/src/Enum/SortByType.php b/src/Service/SecretsManager/src/Enum/SortByType.php
new file mode 100644
index 000000000..9d4b680cd
--- /dev/null
+++ b/src/Service/SecretsManager/src/Enum/SortByType.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace AsyncAws\SecretsManager\Enum;
+
+final class SortByType
+{
+    public const CREATED_DATE = 'created-date';
+    public const LAST_ACCESSED_DATE = 'last-accessed-date';
+    public const LAST_CHANGED_DATE = 'last-changed-date';
+    public const NAME = 'name';
+
+    public static function exists(string $value): bool
+    {
+        return isset([
+            self::CREATED_DATE => true,
+            self::LAST_ACCESSED_DATE => true,
+            self::LAST_CHANGED_DATE => true,
+            self::NAME => true,
+        ][$value]);
+    }
+}
diff --git a/src/Service/SecretsManager/src/Input/ListSecretsRequest.php b/src/Service/SecretsManager/src/Input/ListSecretsRequest.php
index c22a8b71b..6d543abce 100644
--- a/src/Service/SecretsManager/src/Input/ListSecretsRequest.php
+++ b/src/Service/SecretsManager/src/Input/ListSecretsRequest.php
@@ -6,6 +6,7 @@
 use AsyncAws\Core\Input;
 use AsyncAws\Core\Request;
 use AsyncAws\Core\Stream\StreamFactory;
+use AsyncAws\SecretsManager\Enum\SortByType;
 use AsyncAws\SecretsManager\Enum\SortOrderType;
 use AsyncAws\SecretsManager\ValueObject\Filter;
 
@@ -51,6 +52,13 @@ final class ListSecretsRequest extends Input
      */
     private $sortOrder;
 
+    /**
+     * If not specified, secrets are listed by `CreatedDate`.
+     *
+     * @var SortByType::*|null
+     */
+    private $sortBy;
+
     /**
      * @param array{
      *   IncludePlannedDeletion?: bool|null,
@@ -58,6 +66,7 @@ final class ListSecretsRequest extends Input
      *   NextToken?: string|null,
      *   Filters?: array<Filter|array>|null,
      *   SortOrder?: SortOrderType::*|null,
+     *   SortBy?: SortByType::*|null,
      *   '@region'?: string|null,
      * } $input
      */
@@ -68,6 +77,7 @@ public function __construct(array $input = [])
         $this->nextToken = $input['NextToken'] ?? null;
         $this->filters = isset($input['Filters']) ? array_map([Filter::class, 'create'], $input['Filters']) : null;
         $this->sortOrder = $input['SortOrder'] ?? null;
+        $this->sortBy = $input['SortBy'] ?? null;
         parent::__construct($input);
     }
 
@@ -78,6 +88,7 @@ public function __construct(array $input = [])
      *   NextToken?: string|null,
      *   Filters?: array<Filter|array>|null,
      *   SortOrder?: SortOrderType::*|null,
+     *   SortBy?: SortByType::*|null,
      *   '@region'?: string|null,
      * }|ListSecretsRequest $input
      */
@@ -109,6 +120,14 @@ public function getNextToken(): ?string
         return $this->nextToken;
     }
 
+    /**
+     * @return SortByType::*|null
+     */
+    public function getSortBy(): ?string
+    {
+        return $this->sortBy;
+    }
+
     /**
      * @return SortOrderType::*|null
      */
@@ -174,6 +193,16 @@ public function setNextToken(?string $value): self
         return $this;
     }
 
+    /**
+     * @param SortByType::*|null $value
+     */
+    public function setSortBy(?string $value): self
+    {
+        $this->sortBy = $value;
+
+        return $this;
+    }
+
     /**
      * @param SortOrderType::*|null $value
      */
@@ -210,6 +239,12 @@ private function requestBody(): array
             }
             $payload['SortOrder'] = $v;
         }
+        if (null !== $v = $this->sortBy) {
+            if (!SortByType::exists($v)) {
+                throw new InvalidArgument(\sprintf('Invalid parameter "SortBy" for "%s". The value "%s" is not a valid "SortByType".', __CLASS__, $v));
+            }
+            $payload['SortBy'] = $v;
+        }
 
         return $payload;
     }
diff --git a/src/Service/SecretsManager/src/SecretsManagerClient.php b/src/Service/SecretsManager/src/SecretsManagerClient.php
index 94f55a2d6..7e0b3f7f5 100644
--- a/src/Service/SecretsManager/src/SecretsManagerClient.php
+++ b/src/Service/SecretsManager/src/SecretsManagerClient.php
@@ -7,6 +7,7 @@
 use AsyncAws\Core\AwsError\JsonRpcAwsErrorFactory;
 use AsyncAws\Core\Configuration;
 use AsyncAws\Core\RequestContext;
+use AsyncAws\SecretsManager\Enum\SortByType;
 use AsyncAws\SecretsManager\Enum\SortOrderType;
 use AsyncAws\SecretsManager\Exception\DecryptionFailureException;
 use AsyncAws\SecretsManager\Exception\EncryptionFailureException;
@@ -293,6 +294,7 @@ public function getSecretValue($input): GetSecretValueResponse
      *   NextToken?: string|null,
      *   Filters?: array<Filter|array>|null,
      *   SortOrder?: SortOrderType::*|null,
+     *   SortBy?: SortByType::*|null,
      *   '@region'?: string|null,
      * }|ListSecretsRequest $input
      *