diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index c2069c7ba51..032387bec99 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -4,7 +4,7 @@
   "features": {
     "ghcr.io/devcontainers/features/docker-in-docker:1": {},
     "ghcr.io/devcontainers/features/dotnet": {
-      "version": "8.0.204"
+      "version": "6.0.421"
     },
     "ghcr.io/devcontainers/features/node:1": {
       "version": "16"
diff --git a/.gitignore b/.gitignore
index 411fe4011a5..34d18c4cedc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,5 +26,4 @@ _dotnetsdk
 TestResults
 TestLogs
 .DS_Store
-.mono
 **/*.DotSettings.user
\ No newline at end of file
diff --git a/src/Runner.Common/Runner.Common.csproj b/src/Runner.Common/Runner.Common.csproj
index 6c4635626a2..329a024aac6 100644
--- a/src/Runner.Common/Runner.Common.csproj
+++ b/src/Runner.Common/Runner.Common.csproj
@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+    <NoWarn>NU1701;NU1603</NoWarn>
     <Version>$(Version)</Version>
   </PropertyGroup>
 
@@ -15,11 +15,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
+    <PackageReference Include="Microsoft.Win32.Registry" Version="4.4.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
-    <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="4.4.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Threading.Channels" Version="4.4.0" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
diff --git a/src/Runner.Listener/Configuration/RSAEncryptedFileKeyManager.cs b/src/Runner.Listener/Configuration/RSAEncryptedFileKeyManager.cs
index a404a674e96..15291be4387 100644
--- a/src/Runner.Listener/Configuration/RSAEncryptedFileKeyManager.cs
+++ b/src/Runner.Listener/Configuration/RSAEncryptedFileKeyManager.cs
@@ -1,5 +1,4 @@
 #if OS_WINDOWS
-#pragma warning disable CA1416
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
@@ -85,5 +84,4 @@ void IRunnerService.Initialize(IHostContext context)
         }
     }
 }
-#pragma warning restore CA1416
 #endif
diff --git a/src/Runner.Listener/Runner.Listener.csproj b/src/Runner.Listener/Runner.Listener.csproj
index afd528128a5..3cd72ec61f8 100644
--- a/src/Runner.Listener/Runner.Listener.csproj
+++ b/src/Runner.Listener/Runner.Listener.csproj
@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
-    <SelfContained>true</SelfContained>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+    <NoWarn>NU1701;NU1603</NoWarn>
     <Version>$(Version)</Version>
     <PredefinedCulturesOnly>false</PredefinedCulturesOnly>
     <PublishReadyToRunComposite>true</PublishReadyToRunComposite>
@@ -19,11 +18,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
+    <PackageReference Include="Microsoft.Win32.Registry" Version="4.4.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="System.IO.FileSystem.AccessControl" Version="5.0.0" />
-    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
-    <PackageReference Include="System.ServiceProcess.ServiceController" Version="8.0.0" />
+    <PackageReference Include="System.IO.FileSystem.AccessControl" Version="4.4.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="4.4.0" />
+    <PackageReference Include="System.ServiceProcess.ServiceController" Version="4.4.0" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
diff --git a/src/Runner.Listener/Runner.cs b/src/Runner.Listener/Runner.cs
index d83cefa0645..e2f638522b8 100644
--- a/src/Runner.Listener/Runner.cs
+++ b/src/Runner.Listener/Runner.cs
@@ -228,12 +228,10 @@ public async Task<int> ExecuteCommand(CommandSettings command)
                             var configFile = Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Root), config.Key);
                             var configContent = Convert.FromBase64String(config.Value);
 #if OS_WINDOWS
-#pragma warning disable CA1416
                             if (configFile == HostContext.GetConfigFile(WellKnownConfigFile.RSACredentials))
                             {
                                 configContent = ProtectedData.Protect(configContent, null, DataProtectionScope.LocalMachine);
                             }
-#pragma warning restore CA1416
 #endif
                             File.WriteAllBytes(configFile, configContent);
                             File.SetAttributes(configFile, File.GetAttributes(configFile) | FileAttributes.Hidden);
diff --git a/src/Runner.PluginHost/Runner.PluginHost.csproj b/src/Runner.PluginHost/Runner.PluginHost.csproj
index 81a8d2e4304..df30f3450a2 100644
--- a/src/Runner.PluginHost/Runner.PluginHost.csproj
+++ b/src/Runner.PluginHost/Runner.PluginHost.csproj
@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
-    <SelfContained>true</SelfContained>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+    <NoWarn>NU1701;NU1603</NoWarn>
     <Version>$(Version)</Version>
     <PredefinedCulturesOnly>false</PredefinedCulturesOnly>
     <PublishReadyToRunComposite>true</PublishReadyToRunComposite>
diff --git a/src/Runner.Plugins/Runner.Plugins.csproj b/src/Runner.Plugins/Runner.Plugins.csproj
index a786cf1cd1b..39245a3f7a7 100644
--- a/src/Runner.Plugins/Runner.Plugins.csproj
+++ b/src/Runner.Plugins/Runner.Plugins.csproj
@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
-    <SelfContained>true</SelfContained>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+    <NoWarn>NU1701;NU1603</NoWarn>
     <Version>$(Version)</Version>
   </PropertyGroup>
 
diff --git a/src/Runner.Sdk/Runner.Sdk.csproj b/src/Runner.Sdk/Runner.Sdk.csproj
index 55dbf12627c..202e8669a64 100644
--- a/src/Runner.Sdk/Runner.Sdk.csproj
+++ b/src/Runner.Sdk/Runner.Sdk.csproj
@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
-    <SelfContained>true</SelfContained>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+    <NoWarn>NU1701;NU1603</NoWarn>
     <Version>$(Version)</Version>
   </PropertyGroup>
 
@@ -15,9 +14,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
-    <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="Microsoft.Win32.Registry" Version="4.4.0" />
+    <PackageReference Include="System.Threading.Channels" Version="4.4.0" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
diff --git a/src/Runner.Worker/Runner.Worker.csproj b/src/Runner.Worker/Runner.Worker.csproj
index 53c1610df3e..eee59b8721c 100644
--- a/src/Runner.Worker/Runner.Worker.csproj
+++ b/src/Runner.Worker/Runner.Worker.csproj
@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
-    <SelfContained>true</SelfContained>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-    <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+    <NoWarn>NU1701;NU1603</NoWarn>
     <Version>$(Version)</Version>
     <PredefinedCulturesOnly>false</PredefinedCulturesOnly>
     <PublishReadyToRunComposite>true</PublishReadyToRunComposite>
@@ -19,9 +18,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
-    <PackageReference Include="System.ServiceProcess.ServiceController" Version="8.0.0" />
-    <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="4.4.0" />
+    <PackageReference Include="System.ServiceProcess.ServiceController" Version="4.4.0" />
+    <PackageReference Include="System.Threading.Channels" Version="4.4.0" />
     <PackageReference Include="YamlDotNet.Signed" Version="5.3.0" />
   </ItemGroup>
 
diff --git a/src/Sdk/Common/Common/Exceptions/PropertyExceptions.cs b/src/Sdk/Common/Common/Exceptions/PropertyExceptions.cs
index 72367654bf1..34c97b73a1d 100644
--- a/src/Sdk/Common/Common/Exceptions/PropertyExceptions.cs
+++ b/src/Sdk/Common/Common/Exceptions/PropertyExceptions.cs
@@ -34,7 +34,6 @@ protected VssPropertyValidationException(SerializationInfo info, StreamingContex
 
         public String PropertyName { get; set; }
 
-        [Obsolete]
         [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
diff --git a/src/Sdk/Common/Common/VssException.cs b/src/Sdk/Common/Common/VssException.cs
index 5f8fb8c2554..7cead78655d 100644
--- a/src/Sdk/Common/Common/VssException.cs
+++ b/src/Sdk/Common/Common/VssException.cs
@@ -127,7 +127,6 @@ protected VssException(SerializationInfo info, StreamingContext context)
             EventId = (int)info.GetValue("m_eventId", typeof(int));
         }
 
-        [Obsolete]
         [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
diff --git a/src/Sdk/Sdk.csproj b/src/Sdk/Sdk.csproj
index a1ccd9be851..ff1cb85a4fe 100644
--- a/src/Sdk/Sdk.csproj
+++ b/src/Sdk/Sdk.csproj
@@ -1,12 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net6.0</TargetFramework>
         <OutputType>Library</OutputType>
         <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
-        <!-- <SelfContained>true</SelfContained> -->
         <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-        <NoWarn>NU1701;NU1603;SYSLIB0050;SYSLIB0051</NoWarn>
+        <NoWarn>NU1701;NU1603</NoWarn>
         <Version>$(Version)</Version>
         <DefineConstants>TRACE</DefineConstants>
         <LangVersion>8.0</LangVersion>
@@ -15,13 +14,13 @@
 
     <ItemGroup>
         <PackageReference Include="Azure.Storage.Blobs" Version="12.19.1" />
-        <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
+        <PackageReference Include="Microsoft.Win32.Registry" Version="4.4.0" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-        <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0" />
-        <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="7.5.1" />
-        <PackageReference Include="System.Security.Cryptography.Cng" Version="5.0.0" />
-        <PackageReference Include="System.Security.Cryptography.Pkcs" Version="5.0.0" />
-        <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
+        <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.9" />
+        <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="5.2.1" />
+        <PackageReference Include="System.Security.Cryptography.Cng" Version="4.4.0" />
+        <PackageReference Include="System.Security.Cryptography.Pkcs" Version="4.4.0" />
+        <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="4.4.0" />
         <PackageReference Include="Minimatch" Version="2.0.0" />
         <PackageReference Include="YamlDotNet.Signed" Version="5.3.0" />
         <PackageReference Include="System.Net.Http" Version="4.3.4" />
diff --git a/src/Sdk/WebApi/WebApi/OAuth/VssOAuthExceptions.cs b/src/Sdk/WebApi/WebApi/OAuth/VssOAuthExceptions.cs
index 34ec103d05f..5ebf86f9a8d 100644
--- a/src/Sdk/WebApi/WebApi/OAuth/VssOAuthExceptions.cs
+++ b/src/Sdk/WebApi/WebApi/OAuth/VssOAuthExceptions.cs
@@ -85,7 +85,6 @@ public String Error
             set;
         }
 
-        [Obsolete]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);
diff --git a/src/Sdk/WebApi/WebApi/VssServiceResponseException.cs b/src/Sdk/WebApi/WebApi/VssServiceResponseException.cs
index 8dc275c0098..e4aa84a736d 100644
--- a/src/Sdk/WebApi/WebApi/VssServiceResponseException.cs
+++ b/src/Sdk/WebApi/WebApi/VssServiceResponseException.cs
@@ -24,7 +24,6 @@ protected VssServiceResponseException(SerializationInfo info, StreamingContext c
             HttpStatusCode = (HttpStatusCode)info.GetInt32("HttpStatusCode");
         }
 
-        [Obsolete]
         [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
diff --git a/src/Test/Test.csproj b/src/Test/Test.csproj
index aebe242096f..1beddbfc251 100644
--- a/src/Test/Test.csproj
+++ b/src/Test/Test.csproj
@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net6.0</TargetFramework>
         <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
         <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
-        <NoWarn>NU1701;NU1603;NU1603;xUnit2013;SYSLIB0050;SYSLIB0051</NoWarn>
+        <NoWarn>NU1701;NU1603;NU1603;xUnit2013;</NoWarn>
     </PropertyGroup>
 
     <ItemGroup>
@@ -15,13 +15,13 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
         <PackageReference Include="xunit" Version="2.7.1" />
-        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
         <PackageReference Include="System.Buffers" Version="4.5.1" />
-        <PackageReference Include="System.Reflection.TypeExtensions" Version="4.7.0" />
+        <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0" />
         <PackageReference Include="System.Threading.ThreadPool" Version="4.3.0" />
-        <PackageReference Include="Moq" Version="4.20.70" />
+        <PackageReference Include="Moq" Version="4.11.0" />
     </ItemGroup>
 
     <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
diff --git a/src/dev.sh b/src/dev.sh
index 29a5ecf1247..0fc58761e53 100755
--- a/src/dev.sh
+++ b/src/dev.sh
@@ -17,7 +17,7 @@ LAYOUT_DIR="$SCRIPT_DIR/../_layout"
 DOWNLOAD_DIR="$SCRIPT_DIR/../_downloads/netcore2x"
 PACKAGE_DIR="$SCRIPT_DIR/../_package"
 DOTNETSDK_ROOT="$SCRIPT_DIR/../_dotnetsdk"
-DOTNETSDK_VERSION="8.0.204"
+DOTNETSDK_VERSION="6.0.421"
 DOTNETSDK_INSTALLDIR="$DOTNETSDK_ROOT/$DOTNETSDK_VERSION"
 RUNNER_VERSION=$(cat runnerversion)
 
diff --git a/src/global.json b/src/global.json
index 1658e45125b..e7028fe0dd4 100644
--- a/src/global.json
+++ b/src/global.json
@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "8.0.204"
+    "version": "6.0.421"
   }
 }