diff --git a/.autover/changes/f6aa1ac3-20e2-40f5-b214-288e18db8358.json b/.autover/changes/f6aa1ac3-20e2-40f5-b214-288e18db8358.json
new file mode 100644
index 0000000..9befa6c
--- /dev/null
+++ b/.autover/changes/f6aa1ac3-20e2-40f5-b214-288e18db8358.json
@@ -0,0 +1,13 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Extensions.Configuration.SystemsManager",
+      "Type": "Major",
+      "ChangelogMessages": [
+        "Update AWS SDK to Preview 11",
+        "Remove support for .NET 6",
+        "Remove support for netcoreapp3.1"
+      ]
+    }
+  ]
+}
diff --git a/src/Amazon.Extensions.Configuration.SystemsManager/Amazon.Extensions.Configuration.SystemsManager.csproj b/src/Amazon.Extensions.Configuration.SystemsManager/Amazon.Extensions.Configuration.SystemsManager.csproj
index 472b4a0..ddfd800 100644
--- a/src/Amazon.Extensions.Configuration.SystemsManager/Amazon.Extensions.Configuration.SystemsManager.csproj
+++ b/src/Amazon.Extensions.Configuration.SystemsManager/Amazon.Extensions.Configuration.SystemsManager.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <!-- Included netstandard2.0 support for a .NET Framework use-case, see: https://github.com/aws/aws-dotnet-extensions-configuration/pull/150 -->
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net8.0</TargetFrameworks>
     <AssemblyName>Amazon.Extensions.Configuration.SystemsManager</AssemblyName>
     <RootNamespace>Amazon.Extensions.Configuration.SystemsManager</RootNamespace>
     <OutputType>Library</OutputType>
@@ -44,9 +44,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.AppConfigData" Version="4.0.0-preview.8" />
-    <PackageReference Include="AWSSDK.Extensions.NETCore.Setup" Version="4.0.0-preview.8" />
-    <PackageReference Include="AWSSDK.SimpleSystemsManagement" Version="4.0.0-preview.8" />
+    <PackageReference Include="AWSSDK.AppConfigData" Version="4.0.0-preview.11" />
+    <PackageReference Include="AWSSDK.Extensions.NETCore.Setup" Version="4.0.0-preview.11" />
+    <PackageReference Include="AWSSDK.SimpleSystemsManagement" Version="4.0.0-preview.11" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.0.*" />
     <PackageReference Include="System.Text.Json" Condition=" '$(TargetFramework)' == 'netstandard2.0' " Version="8.0.5" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
diff --git a/src/Amazon.Extensions.Configuration.SystemsManager/DefaultParameterProcessor.cs b/src/Amazon.Extensions.Configuration.SystemsManager/DefaultParameterProcessor.cs
index 0072973..7f6be11 100644
--- a/src/Amazon.Extensions.Configuration.SystemsManager/DefaultParameterProcessor.cs
+++ b/src/Amazon.Extensions.Configuration.SystemsManager/DefaultParameterProcessor.cs
@@ -40,7 +40,7 @@ public virtual string GetKey(Parameter parameter, string path)
             var name = parameter.Name.StartsWith(path, StringComparison.OrdinalIgnoreCase)
                 ? parameter.Name.Substring(path.Length)
                 : parameter.Name;
-#if NETCOREAPP3_1_OR_GREATER
+#if NET8_0_OR_GREATER
             return name.TrimStart('/').Replace("/", KeyDelimiter, StringComparison.InvariantCulture);
 #else
             return name.TrimStart('/').Replace("/", KeyDelimiter);
diff --git a/src/Amazon.Extensions.Configuration.SystemsManager/Internal/ServiceClientAppender.cs b/src/Amazon.Extensions.Configuration.SystemsManager/Internal/ServiceClientAppender.cs
index c612b70..fe6302e 100644
--- a/src/Amazon.Extensions.Configuration.SystemsManager/Internal/ServiceClientAppender.cs
+++ b/src/Amazon.Extensions.Configuration.SystemsManager/Internal/ServiceClientAppender.cs
@@ -30,7 +30,7 @@ public static void ServiceClientBeforeRequestEvent(object sender, RequestEventAr
             if (e is WebServiceRequestEventArgs args)
             {
                 if (args.Headers.ContainsKey(UserAgentHeader) &&
-#if NETCOREAPP3_1_OR_GREATER
+#if NET8_0_OR_GREATER
                     !args.Headers[UserAgentHeader].Contains(UserAgentSuffix, System.StringComparison.InvariantCulture)
 #else
                     !args.Headers[UserAgentHeader].Contains(UserAgentSuffix)
diff --git a/test/Amazon.Extensions.Configuration.SystemsManager.Integ/Amazon.Extensions.Configuration.SystemsManager.Integ.csproj b/test/Amazon.Extensions.Configuration.SystemsManager.Integ/Amazon.Extensions.Configuration.SystemsManager.Integ.csproj
index be1a080..5c4096b 100644
--- a/test/Amazon.Extensions.Configuration.SystemsManager.Integ/Amazon.Extensions.Configuration.SystemsManager.Integ.csproj
+++ b/test/Amazon.Extensions.Configuration.SystemsManager.Integ/Amazon.Extensions.Configuration.SystemsManager.Integ.csproj
@@ -1,15 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <TargetFramework>net8.0</TargetFramework>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.AppConfig" Version="4.0.0-preview.8" />
+    <PackageReference Include="AWSSDK.AppConfig" Version="4.0.0-preview.11" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-    <PackageReference Include="AWSSDK.SecurityToken" Version="4.0.0-preview.8" />
+    <PackageReference Include="AWSSDK.SecurityToken" Version="4.0.0-preview.11" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
diff --git a/test/Amazon.Extensions.Configuration.SystemsManager.Integ/AppConfigEndToEndTests.cs b/test/Amazon.Extensions.Configuration.SystemsManager.Integ/AppConfigEndToEndTests.cs
index 4d81be9..2610f98 100644
--- a/test/Amazon.Extensions.Configuration.SystemsManager.Integ/AppConfigEndToEndTests.cs
+++ b/test/Amazon.Extensions.Configuration.SystemsManager.Integ/AppConfigEndToEndTests.cs
@@ -6,7 +6,6 @@
 using System.Text.Json;
 using System.Threading.Tasks;
 
-using Amazon;
 using Amazon.AppConfig;
 using Amazon.AppConfig.Model;
 using Amazon.Extensions.NETCore.Setup;
diff --git a/test/Amazon.Extensions.Configuration.SystemsManager.Tests/Amazon.Extensions.Configuration.SystemsManager.Tests.csproj b/test/Amazon.Extensions.Configuration.SystemsManager.Tests/Amazon.Extensions.Configuration.SystemsManager.Tests.csproj
index ef406cf..c0efff9 100644
--- a/test/Amazon.Extensions.Configuration.SystemsManager.Tests/Amazon.Extensions.Configuration.SystemsManager.Tests.csproj
+++ b/test/Amazon.Extensions.Configuration.SystemsManager.Tests/Amazon.Extensions.Configuration.SystemsManager.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <TargetFramework>net8.0</TargetFramework>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <IsPackable>false</IsPackable>
   </PropertyGroup>