diff --git a/eng/Packages.Data.props b/eng/Packages.Data.props
index 44dc46b6a3b8a..03372fd5c5db7 100644
--- a/eng/Packages.Data.props
+++ b/eng/Packages.Data.props
@@ -122,7 +122,7 @@
     All should have PrivateAssets="All" set so they don't become pacakge dependencies
   -->
   <ItemGroup>
-    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20210302.2" PrivateAssets="All" />
+    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20210309.1" PrivateAssets="All" />
     <PackageReference Update="Azure.ClientSdk.Analyzers" Version="0.1.1-dev.20200929.2" PrivateAssets="All" />
     <PackageReference Update="coverlet.collector" Version="1.3.0" PrivateAssets="All" />
     <PackageReference Update="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.1" PrivateAssets="All" />
diff --git a/sdk/storage/Azure.Storage.Blobs/src/Generated/ContainerRestClient.cs b/sdk/storage/Azure.Storage.Blobs/src/Generated/ContainerRestClient.cs
index 642d6c0b9f847..dddc2eda396dd 100644
--- a/sdk/storage/Azure.Storage.Blobs/src/Generated/ContainerRestClient.cs
+++ b/sdk/storage/Azure.Storage.Blobs/src/Generated/ContainerRestClient.cs
@@ -680,7 +680,6 @@ internal HttpMessage CreateSubmitBatchRequest(long contentLength, string multipa
             request.Headers.Add("Accept", "application/xml");
             request.Headers.Add("Content-Length", contentLength);
             request.Headers.Add("Content-Type", multipartContentType);
-            request.Headers.Add("Content-Type", "application/xml");
             request.Content = RequestContent.Create(body);
             return message;
         }
diff --git a/sdk/storage/Azure.Storage.Blobs/src/Generated/ServiceRestClient.cs b/sdk/storage/Azure.Storage.Blobs/src/Generated/ServiceRestClient.cs
index f469d1cab578e..ce49f2cd97746 100644
--- a/sdk/storage/Azure.Storage.Blobs/src/Generated/ServiceRestClient.cs
+++ b/sdk/storage/Azure.Storage.Blobs/src/Generated/ServiceRestClient.cs
@@ -506,7 +506,6 @@ internal HttpMessage CreateSubmitBatchRequest(long contentLength, string multipa
             request.Headers.Add("Accept", "application/xml");
             request.Headers.Add("Content-Length", contentLength);
             request.Headers.Add("Content-Type", multipartContentType);
-            request.Headers.Add("Content-Type", "application/xml");
             request.Content = RequestContent.Create(body);
             return message;
         }