diff --git a/manifest.json b/manifest.json
index 17c433ede..5a5900eda 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
     "variables": {
-        "${LATEST}": "3.334.4"
+        "${LATEST}": "3.334.6"
     },
     "endpoints": "https://raw.githubusercontent.com/aws/aws-sdk-php/${LATEST}/src/data/endpoints.json",
     "services": {
diff --git a/src/Service/CodeBuild/CHANGELOG.md b/src/Service/CodeBuild/CHANGELOG.md
index 9039b8912..ce7c3dc48 100644
--- a/src/Service/CodeBuild/CHANGELOG.md
+++ b/src/Service/CodeBuild/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Added
+
+- AWS api-change: Added `us-iso-east-1` and `us-iso-west-1` regions.
+
 ## 2.6.0
 
 ### Added
diff --git a/src/Service/CodeBuild/composer.json b/src/Service/CodeBuild/composer.json
index 91ac15e9f..a096ffd39 100644
--- a/src/Service/CodeBuild/composer.json
+++ b/src/Service/CodeBuild/composer.json
@@ -28,7 +28,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.6-dev"
+            "dev-master": "2.7-dev"
         }
     }
 }
diff --git a/src/Service/CodeBuild/src/CodeBuildClient.php b/src/Service/CodeBuild/src/CodeBuildClient.php
index 2b1f60f3d..580f77e1c 100644
--- a/src/Service/CodeBuild/src/CodeBuildClient.php
+++ b/src/Service/CodeBuild/src/CodeBuildClient.php
@@ -208,6 +208,14 @@ protected function getEndpointMetadata(?string $region): array
                     'signService' => 'codebuild',
                     'signVersions' => ['v4'],
                 ];
+            case 'us-iso-east-1':
+            case 'us-iso-west-1':
+                return [
+                    'endpoint' => "https://codebuild.$region.c2s.ic.gov",
+                    'signRegion' => $region,
+                    'signService' => 'codebuild',
+                    'signVersions' => ['v4'],
+                ];
         }
 
         return [
diff --git a/src/Service/Scheduler/CHANGELOG.md b/src/Service/Scheduler/CHANGELOG.md
index 53db6994c..88ad94cd4 100644
--- a/src/Service/Scheduler/CHANGELOG.md
+++ b/src/Service/Scheduler/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Added
+
+- AWS api-change: Added `us-iso-east-1`, `us-iso-west-1` and `us-isob-east-1` regions.
+
 ## 1.1.4
 
 ### Changed
diff --git a/src/Service/Scheduler/composer.json b/src/Service/Scheduler/composer.json
index 1e93773c1..c884ad4e1 100644
--- a/src/Service/Scheduler/composer.json
+++ b/src/Service/Scheduler/composer.json
@@ -29,7 +29,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.1-dev"
+            "dev-master": "1.2-dev"
         }
     }
 }
diff --git a/src/Service/Scheduler/src/SchedulerClient.php b/src/Service/Scheduler/src/SchedulerClient.php
index 9192f6e2d..7c0062fdb 100644
--- a/src/Service/Scheduler/src/SchedulerClient.php
+++ b/src/Service/Scheduler/src/SchedulerClient.php
@@ -368,6 +368,24 @@ protected function getEndpointMetadata(?string $region): array
             $region = Configuration::DEFAULT_REGION;
         }
 
+        switch ($region) {
+            case 'us-iso-east-1':
+            case 'us-iso-west-1':
+                return [
+                    'endpoint' => "https://scheduler.$region.c2s.ic.gov",
+                    'signRegion' => $region,
+                    'signService' => 'scheduler',
+                    'signVersions' => ['v4'],
+                ];
+            case 'us-isob-east-1':
+                return [
+                    'endpoint' => 'https://scheduler.us-isob-east-1.sc2s.sgov.gov',
+                    'signRegion' => 'us-isob-east-1',
+                    'signService' => 'scheduler',
+                    'signVersions' => ['v4'],
+                ];
+        }
+
         return [
             'endpoint' => "https://scheduler.$region.amazonaws.com",
             'signRegion' => $region,