diff --git a/manifest.json b/manifest.json
index 205974654..924ec15fa 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
     "variables": {
-        "${LATEST}": "3.322.10"
+        "${LATEST}": "3.323.0"
     },
     "endpoints": "https://raw.githubusercontent.com/aws/aws-sdk-php/${LATEST}/src/data/endpoints.json",
     "services": {
diff --git a/src/Service/Iot/CHANGELOG.md b/src/Service/Iot/CHANGELOG.md
index 210fd1f96..b64ef2dcd 100644
--- a/src/Service/Iot/CHANGELOG.md
+++ b/src/Service/Iot/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Changed
 
 - Enable compiler optimization for the `sprintf` function.
+- AWS enhancement: Documentation updates.
 
 ## 2.0.3
 
diff --git a/src/Service/Iot/src/IotClient.php b/src/Service/Iot/src/IotClient.php
index b4f4230a1..18913f819 100644
--- a/src/Service/Iot/src/IotClient.php
+++ b/src/Service/Iot/src/IotClient.php
@@ -173,7 +173,9 @@ public function createThingGroup($input): CreateThingGroupResponse
     }
 
     /**
-     * Creates a new thing type.
+     * Creates a new thing type. If this call is made multiple times using the same thing type name and configuration, the
+     * call will succeed. If this call is made with the same thing type name but different configuration a
+     * `ResourceAlreadyExistsException` is thrown.
      *
      * Requires permission to access the CreateThingType [^1] action.
      *
diff --git a/src/Service/XRay/CHANGELOG.md b/src/Service/XRay/CHANGELOG.md
index cd976d526..143afdd2e 100644
--- a/src/Service/XRay/CHANGELOG.md
+++ b/src/Service/XRay/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Added
+
+- AWS api-change: Added `us-isob-east-1` region
+
 ### Changed
 
 - Enable compiler optimization for the `sprintf` function.
diff --git a/src/Service/XRay/composer.json b/src/Service/XRay/composer.json
index 45eb4985d..19b5b64cb 100644
--- a/src/Service/XRay/composer.json
+++ b/src/Service/XRay/composer.json
@@ -27,7 +27,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.1-dev"
+            "dev-master": "1.2-dev"
         }
     }
 }
diff --git a/src/Service/XRay/src/XRayClient.php b/src/Service/XRay/src/XRayClient.php
index b4d2f8666..c6caf702c 100644
--- a/src/Service/XRay/src/XRayClient.php
+++ b/src/Service/XRay/src/XRayClient.php
@@ -134,6 +134,13 @@ protected function getEndpointMetadata(?string $region): array
                     'signService' => 'xray',
                     'signVersions' => ['v4'],
                 ];
+            case 'us-isob-east-1':
+                return [
+                    'endpoint' => 'https://xray.us-isob-east-1.sc2s.sgov.gov',
+                    'signRegion' => 'us-isob-east-1',
+                    'signService' => 'xray',
+                    'signVersions' => ['v4'],
+                ];
         }
 
         return [