diff --git a/.github/release-drafter.yml b/.github/release-drafter.yml
deleted file mode 100644
index f1280823e4..0000000000
--- a/.github/release-drafter.yml
+++ /dev/null
@@ -1,4 +0,0 @@
-template: |
-  ## What's Changed
-
-  $CHANGES
\ No newline at end of file
diff --git a/Ix.NET/Source/Directory.build.props b/Ix.NET/Source/Directory.build.props
index c9fbc7032b..862261566a 100644
--- a/Ix.NET/Source/Directory.build.props
+++ b/Ix.NET/Source/Directory.build.props
@@ -22,8 +22,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19408-01" PrivateAssets="All"/>
-    <PackageReference Include="Nerdbank.GitVersioning" Version="2.3.183" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19367-01" PrivateAssets="All"/>
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.0.25" PrivateAssets="all" />
   </ItemGroup>
 
 
diff --git a/Ix.NET/Source/NuGet.config b/Ix.NET/Source/NuGet.config
deleted file mode 100644
index 5268920aa0..0000000000
--- a/Ix.NET/Source/NuGet.config
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
-    <add key="dotnet-windowsdesktop" value="https://dotnetfeed.blob.core.windows.net/dotnet-windowsdesktop/index.json" />
-    <add key="aspnet-aspnetcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore/index.json" />
-    <add key="aspnet-aspnetcore-tooling" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore-tooling/index.json" />
-    <add key="aspnet-entityframeworkcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-entityframeworkcore/index.json" />
-    <add key="aspnet-extensions" value="https://dotnetfeed.blob.core.windows.net/aspnet-extensions/index.json" />
-    <add key="gRPC repository" value="https://grpc.jfrog.io/grpc/api/nuget/v3/grpc-nuget-dev" />
-    <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
-  </packageSources>
-</configuration>
\ No newline at end of file
diff --git a/Ix.NET/Source/version.json b/Ix.NET/Source/version.json
index df66dffce1..98ce34077d 100644
--- a/Ix.NET/Source/version.json
+++ b/Ix.NET/Source/version.json
@@ -1,5 +1,5 @@
 {
-  "version": "4.0.0-preview.7.build.{height}",
+  "version": "4.0.0-preview.8.build.{height}",
   "publicReleaseRefSpec": [
     "^refs/heads/master$", // we release out of master
     "^refs/heads/rel/v\\d+\\.\\d+" // we also release branches starting with vN.N
diff --git a/Rx.NET/Integration/NuGet.Config b/Rx.NET/Integration/NuGet.Config
index 4506e945ab..b7d67e546f 100644
--- a/Rx.NET/Integration/NuGet.Config
+++ b/Rx.NET/Integration/NuGet.Config
@@ -1,17 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
-    <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
-    <add key="dotnet-windowsdesktop" value="https://dotnetfeed.blob.core.windows.net/dotnet-windowsdesktop/index.json" />
-    <add key="aspnet-aspnetcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore/index.json" />
-    <add key="aspnet-aspnetcore-tooling" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore-tooling/index.json" />
-    <add key="aspnet-entityframeworkcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-entityframeworkcore/index.json" />
-    <add key="aspnet-extensions" value="https://dotnetfeed.blob.core.windows.net/aspnet-extensions/index.json" />
-    <add key="gRPC repository" value="https://grpc.jfrog.io/grpc/api/nuget/v3/grpc-nuget-dev" />
-      
-    <add key="myget.org rxnet" value="https://dotnet.myget.org/F/rx/api/v3/index.json" />
-    <add key="Build Packages" value="https://www.myget.org/F/c037199d-41df-4567-b966-25ff65324688/api/v3/index.json" />
-    <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
     <add key="Local Packages" value="./LocalPackages" />
-  </packageSources>  
+  </packageSources>
 </configuration>
diff --git a/Rx.NET/Integration/global.json b/Rx.NET/Integration/global.json
index 0af6548b41..fade553399 100644
--- a/Rx.NET/Integration/global.json
+++ b/Rx.NET/Integration/global.json
@@ -3,6 +3,6 @@
     "version": "3.0.100-preview"
   },
   "msbuild-sdks": {
-    "MSBuild.Sdk.Extras": "2.0.0-preview.14"
+    "MSBuild.Sdk.Extras": "2.0.31"
   }
 }
\ No newline at end of file
diff --git a/Rx.NET/Source/Directory.build.props b/Rx.NET/Source/Directory.build.props
index de1ecd0c21..02a3d44c17 100644
--- a/Rx.NET/Source/Directory.build.props
+++ b/Rx.NET/Source/Directory.build.props
@@ -1,4 +1,4 @@
-<Project>    
+<Project>
   <PropertyGroup>
     <Copyright>Copyright (c) .NET Foundation and Contributors.</Copyright>
     <MinClientVersion>2.12</MinClientVersion>
@@ -21,15 +21,15 @@
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
-  
-  
+
+
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19408-01" PrivateAssets="All"/>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19367-01" PrivateAssets="All"/>
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.0.25" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(IsTestProject)' == 'true'">
     <PackageReference Include="coverlet.collector" Version="1.0.1" />
-  </ItemGroup>  
+  </ItemGroup>
 
 </Project>
diff --git a/Rx.NET/Source/NuGet.config b/Rx.NET/Source/NuGet.config
deleted file mode 100644
index 5268920aa0..0000000000
--- a/Rx.NET/Source/NuGet.config
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
-    <add key="dotnet-windowsdesktop" value="https://dotnetfeed.blob.core.windows.net/dotnet-windowsdesktop/index.json" />
-    <add key="aspnet-aspnetcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore/index.json" />
-    <add key="aspnet-aspnetcore-tooling" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore-tooling/index.json" />
-    <add key="aspnet-entityframeworkcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-entityframeworkcore/index.json" />
-    <add key="aspnet-extensions" value="https://dotnetfeed.blob.core.windows.net/aspnet-extensions/index.json" />
-    <add key="gRPC repository" value="https://grpc.jfrog.io/grpc/api/nuget/v3/grpc-nuget-dev" />
-    <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
-  </packageSources>
-</configuration>
\ No newline at end of file
diff --git a/azure-pipelines.ix.yml b/azure-pipelines.ix.yml
index c56bb0ace4..fcdb79dffb 100644
--- a/azure-pipelines.ix.yml
+++ b/azure-pipelines.ix.yml
@@ -14,7 +14,6 @@ pr:
     include:
       - master
       - rel/*
-      - IxAsyncCSharp8
   paths:
     include:
       - Ix.NET/Source/*
@@ -31,7 +30,7 @@ variables:
 steps:
 - task: DotNetCoreInstaller@0
   inputs:
-    version: '3.0.100-preview7-012588'
+    version: '3.0.100-preview8-013656'
 
 - task: DotNetCoreCLI@2
   inputs:
@@ -46,8 +45,6 @@ steps:
 - task: DotNetCoreCLI@2
   inputs:
     command: restore
-    feedsToUse: config
-    nugetConfigPath: Ix.NET/Source/NuGet.config
     projects: Ix.NET/Source/**/*.csproj
   displayName: Restore
 
diff --git a/azure-pipelines.rx.yml b/azure-pipelines.rx.yml
index 5e3a46d434..d12343296d 100644
--- a/azure-pipelines.rx.yml
+++ b/azure-pipelines.rx.yml
@@ -33,8 +33,9 @@ jobs:
   steps:
   - task: UseDotNet@2
     inputs:
-      version: '3.0.100-preview7-012821'
+      version: '3.0.100-preview8-013656'
       includePreviewVersions: true
+      performMultiLevelLookup: true
 
   - task: DotNetCoreCLI@2
     inputs:
@@ -103,7 +104,7 @@ jobs:
       CODECOV_TOKEN: $(CODECOV_TOKEN)
     displayName: Upload coverage to Codecov
     condition: and(succeeded(), not(eq(variables['CODECOV_TOKEN'], '')))
-    
+
   - task: PowerShell@2
     displayName: Authenticode Sign Packages
     inputs:
@@ -134,7 +135,7 @@ jobs:
   steps:
   - task: UseDotNet@2
     inputs:
-      version: '3.0.100-preview7-012821'
+      version: '3.0.100-preview8-013656'
       includePreviewVersions: true
 
   - task: UseDotNet@2
@@ -211,8 +212,9 @@ jobs:
   steps:
   - task: UseDotNet@2
     inputs:
-      version: '3.0.100-preview7-012821'
+      version: '3.0.100-preview8-013656'
       includePreviewVersions: true
+      performMultiLevelLookup: true
 
   - task: DotNetCoreCLI@2
     inputs: