diff --git a/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.api.json b/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.api.json
index 7f0d1e9ba3e3..dcb488af6947 100644
--- a/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.api.json
+++ b/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.api.json
@@ -17386,7 +17386,8 @@
         "ml.inf2.xlarge",
         "ml.inf2.8xlarge",
         "ml.inf2.24xlarge",
-        "ml.inf2.48xlarge"
+        "ml.inf2.48xlarge",
+        "ml.p5.48xlarge"
       ]
     },
     "ProductionVariantList":{
@@ -18778,10 +18779,7 @@
     },
     "SelectiveExecutionConfig":{
       "type":"structure",
-      "required":[
-        "SourcePipelineExecutionArn",
-        "SelectedSteps"
-      ],
+      "required":["SelectedSteps"],
       "members":{
         "SourcePipelineExecutionArn":{"shape":"PipelineExecutionArn"},
         "SelectedSteps":{"shape":"SelectedStepList"}
diff --git a/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.docs.json b/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.docs.json
index 8e99ebb278d3..7f2939fe687f 100644
--- a/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.docs.json
+++ b/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.docs.json
@@ -10691,7 +10691,7 @@
         "PipelineExecutionSummary$PipelineExecutionArn": "<p>The Amazon Resource Name (ARN) of the pipeline execution.</p>",
         "RetryPipelineExecutionRequest$PipelineExecutionArn": "<p>The Amazon Resource Name (ARN) of the pipeline execution.</p>",
         "RetryPipelineExecutionResponse$PipelineExecutionArn": "<p>The Amazon Resource Name (ARN) of the pipeline execution.</p>",
-        "SelectiveExecutionConfig$SourcePipelineExecutionArn": "<p>The ARN from a reference execution of the current pipeline. Used to copy input collaterals needed for the selected steps to run. The execution status of the pipeline can be either <code>Failed</code> or <code>Success</code>.</p>",
+        "SelectiveExecutionConfig$SourcePipelineExecutionArn": "<p>The ARN from a reference execution of the current pipeline. Used to copy input collaterals needed for the selected steps to run. The execution status of the pipeline can be either <code>Failed</code> or <code>Success</code>.</p> <p>This field is required if the steps you specify for <code>SelectedSteps</code> depend on output collaterals from any non-specified pipeline steps. For more information, see <a href=\"https://docs.aws.amazon.com/sagemaker/latest/dg/pipelines-selective-ex.html\">Selective Execution for Pipeline Steps</a>.</p>",
         "SelectiveExecutionResult$SourcePipelineExecutionArn": "<p>The ARN from an execution of the current pipeline.</p>",
         "SendPipelineExecutionStepFailureResponse$PipelineExecutionArn": "<p>The Amazon Resource Name (ARN) of the pipeline execution.</p>",
         "SendPipelineExecutionStepSuccessResponse$PipelineExecutionArn": "<p>The Amazon Resource Name (ARN) of the pipeline execution.</p>",
diff --git a/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.normal.json b/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.normal.json
index ef8bad9ae722..21af2b1ea5dd 100644
--- a/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.normal.json
+++ b/generator/ServiceModels/sagemaker/sagemaker-2017-07-24.normal.json
@@ -28439,7 +28439,8 @@
         "ml.inf2.xlarge",
         "ml.inf2.8xlarge",
         "ml.inf2.24xlarge",
-        "ml.inf2.48xlarge"
+        "ml.inf2.48xlarge",
+        "ml.p5.48xlarge"
       ]
     },
     "ProductionVariantList":{
@@ -30595,14 +30596,11 @@
     },
     "SelectiveExecutionConfig":{
       "type":"structure",
-      "required":[
-        "SourcePipelineExecutionArn",
-        "SelectedSteps"
-      ],
+      "required":["SelectedSteps"],
       "members":{
         "SourcePipelineExecutionArn":{
           "shape":"PipelineExecutionArn",
-          "documentation":"<p>The ARN from a reference execution of the current pipeline. Used to copy input collaterals needed for the selected steps to run. The execution status of the pipeline can be either <code>Failed</code> or <code>Success</code>.</p>"
+          "documentation":"<p>The ARN from a reference execution of the current pipeline. Used to copy input collaterals needed for the selected steps to run. The execution status of the pipeline can be either <code>Failed</code> or <code>Success</code>.</p> <p>This field is required if the steps you specify for <code>SelectedSteps</code> depend on output collaterals from any non-specified pipeline steps. For more information, see <a href=\"https://docs.aws.amazon.com/sagemaker/latest/dg/pipelines-selective-ex.html\">Selective Execution for Pipeline Steps</a>.</p>"
         },
         "SelectedSteps":{
           "shape":"SelectedStepList",
diff --git a/sdk/src/Services/SageMaker/Generated/Model/SelectiveExecutionConfig.cs b/sdk/src/Services/SageMaker/Generated/Model/SelectiveExecutionConfig.cs
index e5fc1e286ccd..a61a26f2f6f6 100644
--- a/sdk/src/Services/SageMaker/Generated/Model/SelectiveExecutionConfig.cs
+++ b/sdk/src/Services/SageMaker/Generated/Model/SelectiveExecutionConfig.cs
@@ -63,8 +63,15 @@ internal bool IsSetSelectedSteps()
         /// needed for the selected steps to run. The execution status of the pipeline can be
         /// either <code>Failed</code> or <code>Success</code>.
         /// </para>
+        ///  
+        /// <para>
+        /// This field is required if the steps you specify for <code>SelectedSteps</code> depend
+        /// on output collaterals from any non-specified pipeline steps. For more information,
+        /// see <a href="https://docs.aws.amazon.com/sagemaker/latest/dg/pipelines-selective-ex.html">Selective
+        /// Execution for Pipeline Steps</a>.
+        /// </para>
         /// </summary>
-        [AWSProperty(Required=true, Max=256)]
+        [AWSProperty(Max=256)]
         public string SourcePipelineExecutionArn
         {
             get { return this._sourcePipelineExecutionArn; }
diff --git a/sdk/src/Services/SageMaker/Generated/ServiceEnumerations.cs b/sdk/src/Services/SageMaker/Generated/ServiceEnumerations.cs
index 1b2b855ca8a6..d7b401d4ec3c 100644
--- a/sdk/src/Services/SageMaker/Generated/ServiceEnumerations.cs
+++ b/sdk/src/Services/SageMaker/Generated/ServiceEnumerations.cs
@@ -11205,6 +11205,10 @@ public class ProductionVariantInstanceType : ConstantClass
         /// </summary>
         public static readonly ProductionVariantInstanceType MlP4de24xlarge = new ProductionVariantInstanceType("ml.p4de.24xlarge");
         /// <summary>
+        /// Constant MlP548xlarge for ProductionVariantInstanceType
+        /// </summary>
+        public static readonly ProductionVariantInstanceType MlP548xlarge = new ProductionVariantInstanceType("ml.p5.48xlarge");
+        /// <summary>
         /// Constant MlR512xlarge for ProductionVariantInstanceType
         /// </summary>
         public static readonly ProductionVariantInstanceType MlR512xlarge = new ProductionVariantInstanceType("ml.r5.12xlarge");