diff --git a/manifest.json b/manifest.json
index 2d63081f1..25caafa5d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
     "variables": {
-        "${LATEST}": "3.363.2"
+        "${LATEST}": "3.363.3"
     },
     "endpoints": "https://raw.githubusercontent.com/aws/aws-sdk-php/${LATEST}/src/data/endpoints.json",
     "services": {
diff --git a/src/Service/BedrockRuntime/CHANGELOG.md b/src/Service/BedrockRuntime/CHANGELOG.md
index 171d6e999..d3597476c 100644
--- a/src/Service/BedrockRuntime/CHANGELOG.md
+++ b/src/Service/BedrockRuntime/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Added
 
 - AWS api-change: Amazon Bedrock Runtime Service Tier Support Launch
+- AWS api-change: Bedrock Runtime Reserved Service Support
 
 ### Dependency bumped
 
diff --git a/src/Service/BedrockRuntime/src/Enum/ServiceTierType.php b/src/Service/BedrockRuntime/src/Enum/ServiceTierType.php
index fa0fd4112..48f1614ee 100644
--- a/src/Service/BedrockRuntime/src/Enum/ServiceTierType.php
+++ b/src/Service/BedrockRuntime/src/Enum/ServiceTierType.php
@@ -7,6 +7,7 @@ final class ServiceTierType
     public const DEFAULT = 'default';
     public const FLEX = 'flex';
     public const PRIORITY = 'priority';
+    public const RESERVED = 'reserved';
 
     public static function exists(string $value): bool
     {
@@ -14,6 +15,7 @@ public static function exists(string $value): bool
             self::DEFAULT => true,
             self::FLEX => true,
             self::PRIORITY => true,
+            self::RESERVED => true,
         ][$value]);
     }
 }