diff --git a/manifest.json b/manifest.json
index 3170cdbaa..acb44e130 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
     "variables": {
-        "${LATEST}": "3.342.32"
+        "${LATEST}": "3.342.33"
     },
     "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 ba158e71a..66e6aa3bc 100644
--- a/src/Service/CodeBuild/CHANGELOG.md
+++ b/src/Service/CodeBuild/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 - AWS api-change: This release adds support for environment type WINDOWS_SERVER_2022_CONTAINER in ProjectEnvironment
 - AWS api-change: Added `us-isob-east-1` region.
+- AWS api-change: Add support for custom instance type for reserved capacity fleets
 
 ### Changed
 
diff --git a/src/Service/CodeBuild/src/Enum/ComputeType.php b/src/Service/CodeBuild/src/Enum/ComputeType.php
index c8bd25723..322ce20b4 100644
--- a/src/Service/CodeBuild/src/Enum/ComputeType.php
+++ b/src/Service/CodeBuild/src/Enum/ComputeType.php
@@ -15,6 +15,7 @@ final class ComputeType
     public const BUILD_LAMBDA_2GB = 'BUILD_LAMBDA_2GB';
     public const BUILD_LAMBDA_4GB = 'BUILD_LAMBDA_4GB';
     public const BUILD_LAMBDA_8GB = 'BUILD_LAMBDA_8GB';
+    public const CUSTOM_INSTANCE_TYPE = 'CUSTOM_INSTANCE_TYPE';
 
     public static function exists(string $value): bool
     {
@@ -30,6 +31,7 @@ public static function exists(string $value): bool
             self::BUILD_LAMBDA_2GB => true,
             self::BUILD_LAMBDA_4GB => true,
             self::BUILD_LAMBDA_8GB => true,
+            self::CUSTOM_INSTANCE_TYPE => true,
         ][$value]);
     }
 }
diff --git a/src/Service/CodeBuild/src/Result/BatchGetBuildsOutput.php b/src/Service/CodeBuild/src/Result/BatchGetBuildsOutput.php
index e0f51b321..8e581eef4 100644
--- a/src/Service/CodeBuild/src/Result/BatchGetBuildsOutput.php
+++ b/src/Service/CodeBuild/src/Result/BatchGetBuildsOutput.php
@@ -243,6 +243,7 @@ private function populateResultComputeConfiguration(array $json): ComputeConfigu
             'memory' => isset($json['memory']) ? (int) $json['memory'] : null,
             'disk' => isset($json['disk']) ? (int) $json['disk'] : null,
             'machineType' => isset($json['machineType']) ? (string) $json['machineType'] : null,
+            'instanceType' => isset($json['instanceType']) ? (string) $json['instanceType'] : null,
         ]);
     }
 
diff --git a/src/Service/CodeBuild/src/Result/StartBuildOutput.php b/src/Service/CodeBuild/src/Result/StartBuildOutput.php
index 233d94c50..3d8068d72 100644
--- a/src/Service/CodeBuild/src/Result/StartBuildOutput.php
+++ b/src/Service/CodeBuild/src/Result/StartBuildOutput.php
@@ -193,6 +193,7 @@ private function populateResultComputeConfiguration(array $json): ComputeConfigu
             'memory' => isset($json['memory']) ? (int) $json['memory'] : null,
             'disk' => isset($json['disk']) ? (int) $json['disk'] : null,
             'machineType' => isset($json['machineType']) ? (string) $json['machineType'] : null,
+            'instanceType' => isset($json['instanceType']) ? (string) $json['instanceType'] : null,
         ]);
     }
 
diff --git a/src/Service/CodeBuild/src/Result/StopBuildOutput.php b/src/Service/CodeBuild/src/Result/StopBuildOutput.php
index 945e924bd..bf9944e39 100644
--- a/src/Service/CodeBuild/src/Result/StopBuildOutput.php
+++ b/src/Service/CodeBuild/src/Result/StopBuildOutput.php
@@ -193,6 +193,7 @@ private function populateResultComputeConfiguration(array $json): ComputeConfigu
             'memory' => isset($json['memory']) ? (int) $json['memory'] : null,
             'disk' => isset($json['disk']) ? (int) $json['disk'] : null,
             'machineType' => isset($json['machineType']) ? (string) $json['machineType'] : null,
+            'instanceType' => isset($json['instanceType']) ? (string) $json['instanceType'] : null,
         ]);
     }
 
diff --git a/src/Service/CodeBuild/src/ValueObject/ComputeConfiguration.php b/src/Service/CodeBuild/src/ValueObject/ComputeConfiguration.php
index c19ac3ce5..44ae546e3 100644
--- a/src/Service/CodeBuild/src/ValueObject/ComputeConfiguration.php
+++ b/src/Service/CodeBuild/src/ValueObject/ComputeConfiguration.php
@@ -6,7 +6,7 @@
 
 /**
  * Contains compute attributes. These attributes only need be specified when your project's or fleet's `computeType` is
- * set to `ATTRIBUTE_BASED_COMPUTE`.
+ * set to `ATTRIBUTE_BASED_COMPUTE` or `CUSTOM_INSTANCE_TYPE`.
  */
 final class ComputeConfiguration
 {
@@ -38,12 +38,20 @@ final class ComputeConfiguration
      */
     private $machineType;
 
+    /**
+     * The EC2 instance type to be launched in your fleet.
+     *
+     * @var string|null
+     */
+    private $instanceType;
+
     /**
      * @param array{
      *   vCpu?: null|int,
      *   memory?: null|int,
      *   disk?: null|int,
      *   machineType?: null|MachineType::*,
+     *   instanceType?: null|string,
      * } $input
      */
     public function __construct(array $input)
@@ -52,6 +60,7 @@ public function __construct(array $input)
         $this->memory = $input['memory'] ?? null;
         $this->disk = $input['disk'] ?? null;
         $this->machineType = $input['machineType'] ?? null;
+        $this->instanceType = $input['instanceType'] ?? null;
     }
 
     /**
@@ -60,6 +69,7 @@ public function __construct(array $input)
      *   memory?: null|int,
      *   disk?: null|int,
      *   machineType?: null|MachineType::*,
+     *   instanceType?: null|string,
      * }|ComputeConfiguration $input
      */
     public static function create($input): self
@@ -72,6 +82,11 @@ public function getDisk(): ?int
         return $this->disk;
     }
 
+    public function getInstanceType(): ?string
+    {
+        return $this->instanceType;
+    }
+
     /**
      * @return MachineType::*|null
      */