diff --git a/extensions/Worker.Extensions.CosmosDB/release_notes.md b/extensions/Worker.Extensions.CosmosDB/release_notes.md
index 921fdcf34..93fe18e59 100644
--- a/extensions/Worker.Extensions.CosmosDB/release_notes.md
+++ b/extensions/Worker.Extensions.CosmosDB/release_notes.md
@@ -6,4 +6,4 @@
 
 ### Microsoft.Azure.Functions.Worker.Extensions.CosmosDB <version>
 
-- <entry>
+- Updated CosmosDBInputAttribute constructors to allow empty values for databaseName and containerName
diff --git a/extensions/Worker.Extensions.CosmosDB/src/CosmosDBInputAttribute.cs b/extensions/Worker.Extensions.CosmosDB/src/CosmosDBInputAttribute.cs
index bc6aca573..2616085e0 100644
--- a/extensions/Worker.Extensions.CosmosDB/src/CosmosDBInputAttribute.cs
+++ b/extensions/Worker.Extensions.CosmosDB/src/CosmosDBInputAttribute.cs
@@ -2,6 +2,7 @@
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using System.Text.Json.Serialization;
 using Microsoft.Azure.Functions.Worker.Converters;
 using Microsoft.Azure.Functions.Worker.Extensions.Abstractions;
 
@@ -13,9 +14,32 @@ public sealed class CosmosDBInputAttribute : InputBindingAttribute
     {
         /// <summary>
         /// Constructs a new instance.
+        /// Use this constructor when binding to a CosmosClient.
+        /// </summary>
+        public CosmosDBInputAttribute()
+        {
+            DatabaseName = string.Empty;
+            ContainerName = string.Empty;
+        }
+
+        /// <summary>
+        /// Constructs a new instance with the specified database name.
+        /// Use this constructor when binding to a Database.
+        /// </summary>
+        /// <param name="databaseName">The CosmosDB database name.</param>
+        public CosmosDBInputAttribute(string databaseName)
+        {
+            DatabaseName = databaseName;
+            ContainerName = string.Empty;
+        }
+
+        /// <summary>
+        /// Constructs a new instance with the specified database and container names.
+        /// Use this constructor when binding to a Container or a POCO.
         /// </summary>
         /// <param name="databaseName">The CosmosDB database name.</param>
         /// <param name="containerName">The CosmosDB container name.</param>
+        [JsonConstructor]
         public CosmosDBInputAttribute(string databaseName, string containerName)
         {
             DatabaseName = databaseName;
diff --git a/extensions/Worker.Extensions.CosmosDB/src/Properties/AssemblyInfo.cs b/extensions/Worker.Extensions.CosmosDB/src/Properties/AssemblyInfo.cs
index fce96c7ce..f76b45709 100644
--- a/extensions/Worker.Extensions.CosmosDB/src/Properties/AssemblyInfo.cs
+++ b/extensions/Worker.Extensions.CosmosDB/src/Properties/AssemblyInfo.cs
@@ -4,6 +4,6 @@
 using System.Runtime.CompilerServices;
 using Microsoft.Azure.Functions.Worker.Extensions.Abstractions;
 
-[assembly: ExtensionInformation("Microsoft.Azure.WebJobs.Extensions.CosmosDB", "4.2.0")]
+[assembly: ExtensionInformation("Microsoft.Azure.WebJobs.Extensions.CosmosDB", "4.3.0")]
 [assembly: InternalsVisibleTo("Microsoft.Azure.Functions.WorkerExtension.Tests, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]
-[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7")]
\ No newline at end of file
+[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7")]
diff --git a/extensions/Worker.Extensions.CosmosDB/src/Worker.Extensions.CosmosDB.csproj b/extensions/Worker.Extensions.CosmosDB/src/Worker.Extensions.CosmosDB.csproj
index 5c4c751af..99b231f89 100644
--- a/extensions/Worker.Extensions.CosmosDB/src/Worker.Extensions.CosmosDB.csproj
+++ b/extensions/Worker.Extensions.CosmosDB/src/Worker.Extensions.CosmosDB.csproj
@@ -6,8 +6,8 @@
     <Description>Azure Cosmos DB extensions for .NET isolated functions</Description>
 
     <!--Version information-->
-    <VersionPrefix>4.2.0</VersionPrefix>
-    <VersionSuffix>-preview2</VersionSuffix>
+    <VersionPrefix>4.3.1</VersionPrefix>
+    <VersionSuffix>-preview1</VersionSuffix>
 
     <!--Temporarily opting out of documentation. Pending documentation-->
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
@@ -30,4 +30,4 @@
     <SharedReference Include="..\..\Worker.Extensions.Shared\Worker.Extensions.Shared.csproj" />
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>
diff --git a/samples/WorkerBindingSamples/Cosmos/CosmosInputBindingFunctions.cs b/samples/WorkerBindingSamples/Cosmos/CosmosInputBindingFunctions.cs
index 437c08bc7..151eda81f 100644
--- a/samples/WorkerBindingSamples/Cosmos/CosmosInputBindingFunctions.cs
+++ b/samples/WorkerBindingSamples/Cosmos/CosmosInputBindingFunctions.cs
@@ -21,7 +21,7 @@ public CosmosInputBindingFunctions(ILogger<CosmosInputBindingFunctions> logger)
         [Function(nameof(DocsByUsingCosmosClient))]
         public async Task<HttpResponseData>  DocsByUsingCosmosClient(
             [HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequestData req,
-            [CosmosDBInput("", "", Connection = "CosmosDBConnection")] CosmosClient client)
+            [CosmosDBInput(Connection = "CosmosDBConnection")] CosmosClient client)
         {
             _logger.LogInformation("C# HTTP trigger function processed a request.");
 
@@ -43,7 +43,7 @@ public async Task<HttpResponseData>  DocsByUsingCosmosClient(
         [Function(nameof(DocsByUsingDatabaseClient))]
         public async Task<HttpResponseData> DocsByUsingDatabaseClient(
             [HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequestData req,
-            [CosmosDBInput("ToDoItems", "", Connection = "CosmosDBConnection")] Database database)
+            [CosmosDBInput("ToDoItems", Connection = "CosmosDBConnection")] Database database)
         {
             _logger.LogInformation("C# HTTP trigger function processed a request.");
 
diff --git a/test/SdkE2ETests/Contents/WorkerBindingSamplesOutput/functions.metadata b/test/SdkE2ETests/Contents/WorkerBindingSamplesOutput/functions.metadata
index eddb53b95..21cb5cdf4 100644
--- a/test/SdkE2ETests/Contents/WorkerBindingSamplesOutput/functions.metadata
+++ b/test/SdkE2ETests/Contents/WorkerBindingSamplesOutput/functions.metadata
@@ -634,8 +634,6 @@
         "name": "client",
         "direction": "In",
         "type": "cosmosDB",
-        "databaseName": "",
-        "containerName": "",
         "connection": "CosmosDBConnection",
         "properties": {
           "supportsDeferredBinding": "True"
@@ -673,7 +671,6 @@
         "direction": "In",
         "type": "cosmosDB",
         "databaseName": "ToDoItems",
-        "containerName": "",
         "connection": "CosmosDBConnection",
         "properties": {
           "supportsDeferredBinding": "True"
diff --git a/test/SdkE2ETests/PublishTests.cs b/test/SdkE2ETests/PublishTests.cs
index 58c37e015..800c8f6a7 100644
--- a/test/SdkE2ETests/PublishTests.cs
+++ b/test/SdkE2ETests/PublishTests.cs
@@ -121,7 +121,7 @@ private async Task RunPublishTestForSdkTypeBindings(string outputDir, string add
                 extensions = new[]
                 {
                     new Extension("CosmosDB",
-                        "Microsoft.Azure.WebJobs.Extensions.CosmosDB.CosmosDBWebJobsStartup, Microsoft.Azure.WebJobs.Extensions.CosmosDB, Version=4.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35",
+                        "Microsoft.Azure.WebJobs.Extensions.CosmosDB.CosmosDBWebJobsStartup, Microsoft.Azure.WebJobs.Extensions.CosmosDB, Version=4.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35",
                         @"./.azurefunctions/Microsoft.Azure.WebJobs.Extensions.CosmosDB.dll"),
                     new Extension("Startup",
                         "Microsoft.Azure.WebJobs.Extensions.FunctionMetadataLoader.Startup, Microsoft.Azure.WebJobs.Extensions.FunctionMetadataLoader, Version=1.0.0.0, Culture=neutral, PublicKeyToken=551316b6919f366c",