Index: a/src/Interactive/csi/csi.csproj
===================================================================
--- a/src/Interactive/csi/csi.csproj
+++ b/src/Interactive/csi/csi.csproj
@@ -6,6 +6,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>CSharpInteractive</RootNamespace>
     <TargetFrameworks>netcoreapp3.1;net472</TargetFrameworks>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\Compilers\Core\Portable\Microsoft.CodeAnalysis.csproj" />
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Interactive/vbi/vbi.vbproj
===================================================================
--- a/src/Interactive/vbi/vbi.vbproj
+++ b/src/Interactive/vbi/vbi.vbproj
@@ -7,6 +7,7 @@
     <StartupObject>Sub Main</StartupObject>
     <TargetFrameworks>netcoreapp3.1;net472</TargetFrameworks>
     <RootNamespace></RootNamespace>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\Compilers\Core\Portable\Microsoft.CodeAnalysis.csproj" />
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/CompilerGeneratorTools/Source/CSharpSyntaxGenerator/CSharpSyntaxGenerator.csproj
===================================================================
--- a/src/Tools/Source/CompilerGeneratorTools/Source/CSharpSyntaxGenerator/CSharpSyntaxGenerator.csproj
+++ b/src/Tools/Source/CompilerGeneratorTools/Source/CSharpSyntaxGenerator/CSharpSyntaxGenerator.csproj
@@ -14,6 +14,7 @@
     <RuntimeIdentifiers>$(RoslynPortableRuntimeIdentifiers)</RuntimeIdentifiers>
     <IsShipping>false</IsShipping>
     <ExcludeFromSourceBuild>false</ExcludeFromSourceBuild>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup>
     <!-- Make sure to reference the same version of Microsoft.CodeAnalysis.Analyzers as the rest of the build -->
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/PrepareTests/PrepareTests.csproj
===================================================================
--- a/src/Tools/PrepareTests/PrepareTests.csproj
+++ b/src/Tools/PrepareTests/PrepareTests.csproj
@@ -7,6 +7,7 @@
     <SignAssembly>false</SignAssembly>
     <UseVSHostingProcess>false</UseVSHostingProcess>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Mono.Options" Version="$(MonoOptionsVersion)" />
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/CompilerGeneratorTools/Source/BoundTreeGenerator/CompilersBoundTreeGenerator.csproj
===================================================================
--- a/src/Tools/Source/CompilerGeneratorTools/Source/BoundTreeGenerator/CompilersBoundTreeGenerator.csproj
+++ b/src/Tools/Source/CompilerGeneratorTools/Source/BoundTreeGenerator/CompilersBoundTreeGenerator.csproj
@@ -11,8 +11,9 @@
     <AutoGenerateBindingRedirects>True</AutoGenerateBindingRedirects>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup>
     <None Include="app.config" />
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/CompilerGeneratorTools/Source/CSharpErrorFactsGenerator/CSharpErrorFactsGenerator.csproj
===================================================================
--- a/src/Tools/Source/CompilerGeneratorTools/Source/CSharpErrorFactsGenerator/CSharpErrorFactsGenerator.csproj
+++ b/src/Tools/Source/CompilerGeneratorTools/Source/CSharpErrorFactsGenerator/CSharpErrorFactsGenerator.csproj
@@ -10,5 +10,6 @@
     <AutoGenerateBindingRedirects>True</AutoGenerateBindingRedirects>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
-</Project>
\ No newline at end of file
+</Project>
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/CompilerGeneratorTools/Source/IOperationGenerator/CompilersIOperationGenerator.csproj
===================================================================
--- a/src/Tools/Source/CompilerGeneratorTools/Source/IOperationGenerator/CompilersIOperationGenerator.csproj
+++ b/src/Tools/Source/CompilerGeneratorTools/Source/IOperationGenerator/CompilersIOperationGenerator.csproj
@@ -8,5 +8,6 @@
     <AutoGenerateBindingRedirects>True</AutoGenerateBindingRedirects>
     <TargetFramework>net5.0</TargetFramework>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
 </Project>
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicErrorFactsGenerator/VisualBasicErrorFactsGenerator.vbproj
===================================================================
--- a/src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicErrorFactsGenerator/VisualBasicErrorFactsGenerator.vbproj
+++ b/src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicErrorFactsGenerator/VisualBasicErrorFactsGenerator.vbproj
@@ -12,5 +12,6 @@
     <AutoGenerateBindingRedirects>True</AutoGenerateBindingRedirects>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
-</Project>
\ No newline at end of file
+</Project>
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicSyntaxGenerator/VisualBasicSyntaxGenerator.vbproj
===================================================================
--- a/src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicSyntaxGenerator/VisualBasicSyntaxGenerator.vbproj
+++ b/src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicSyntaxGenerator/VisualBasicSyntaxGenerator.vbproj
@@ -13,6 +13,7 @@
     <AutoGenerateBindingRedirects>True</AutoGenerateBindingRedirects>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="..\..\..\..\..\Compilers\VisualBasic\Portable\Declarations\DeclarationModifiers.vb" Link="Grammar\DeclarationModifiers.vb" />
Index: roslyn.dae39045cd460ba44053ff2af2217da126c25dbf/src/Tools/Source/RunTests/RunTests.csproj
===================================================================
--- a/src/Tools/Source/RunTests/RunTests.csproj
+++ b/src/Tools/Source/RunTests/RunTests.csproj
@@ -7,6 +7,7 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <SignAssembly>false</SignAssembly>
     <IsShipping>false</IsShipping>
+    <UseAppHost>false</UseAppHost>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutableVersion)" />