diff --git a/src/Directory.props b/src/Directory.props
index b0630fe3..eccd3517 100644
--- a/src/Directory.props
+++ b/src/Directory.props
@@ -4,7 +4,8 @@
   <PropertyGroup Label="NuGet">
     <PackageTags>dotnet roslyn</PackageTags>
     <PackOnBuild>true</PackOnBuild>
-    <PackFolder>analyzers/dotnet/cs</PackFolder>
+    <ThisAssemblyMinimumRoslynVersion>4.0</ThisAssemblyMinimumRoslynVersion>
+    <PackFolder>analyzers/dotnet/roslyn$(ThisAssemblyMinimumRoslynVersion)/cs</PackFolder>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <RestoreSources>https://api.nuget.org/v3/index.json</RestoreSources>
     <RestoreSources Condition="Exists('$(MSBuildThisFileDirectory)..\..\nugetizer\bin\')">$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)..\..\nugetizer\bin'));$(RestoreSources)</RestoreSources>
diff --git a/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj b/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj
index d07d1adf..8fd25447 100644
--- a/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj
+++ b/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj
@@ -8,7 +8,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly.AssemblyInfo</PackageId>
-    <Description>** C# 9.0+ ONLY **
+    <Description>
 This package generates a static `ThisAssembly.Info` class with public 
 constants exposing the following attribute values generated by default for SDK style projects:
 
diff --git a/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj b/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj
index 63840e32..bd17f326 100644
--- a/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj
+++ b/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj
@@ -8,7 +8,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly.Constants</PackageId>
-    <Description>** C# 9.0+ ONLY **
+    <Description>
 This package generates a static `ThisAssembly.Constants` class with public
 constants for each Constant MSBuild item in the project.
 
diff --git a/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj b/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj
index d50be096..7160a9f5 100644
--- a/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj
+++ b/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj
@@ -8,7 +8,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly.Metadata</PackageId>
-    <Description>** C# 9.0+ ONLY **
+    <Description>
 This package generates a static `ThisAssembly.Metadata` class with public 
 constants exposing each `[System.Reflection.AssemblyMetadata(..)]` defined for the project, 
 such as when using .NET 5.0+ support for `AssemblyMetadata` MSBuild items.
diff --git a/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.csproj b/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.csproj
index 3802f252..154ee17c 100644
--- a/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.csproj
+++ b/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.csproj
@@ -7,11 +7,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly.Prerequisites</PackageId>
-    <Description>Ensures that referencing project satisfies the prerequisites for ThisAssembly, namely:
-
-* MSBuild 16.8+: contains the Roslyn support for source generators
-* C# 9.0 or greater language: it's the only language supported by Roslyn source generators at the moment.
-</Description>
+    <Description>Ensures that referencing project is using a compatible Compiler API (Roslyn).</Description>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.props b/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.props
index 3d62326f..b87c19bb 100644
--- a/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.props
+++ b/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.props
@@ -1,7 +1,9 @@
 <Project>
 
-  <ItemGroup>
-    <CompilerVisibleProperty Include="DebugSourceGenerators" />
-  </ItemGroup>
-  
+  <PropertyGroup>
+    <!-- Incremental source generator interface appeared first on Roslyn 4.0.1, see 
+         https://learn.microsoft.com/en-us/dotnet/api/microsoft.codeanalysis.iincrementalgenerator?view=roslyn-dotnet-4.0.1 -->
+    <ThisAssemblyMinimumRoslynVersion>4.0</ThisAssemblyMinimumRoslynVersion>
+  </PropertyGroup>
+
 </Project>
\ No newline at end of file
diff --git a/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.targets b/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.targets
index e99cf302..a7f41858 100644
--- a/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.targets
+++ b/src/ThisAssembly.Prerequisites/ThisAssembly.Prerequisites.targets
@@ -1,18 +1,21 @@
 <Project>
 
-  <Target Name="EnsureSourceGenerators" BeforeTargets="BeforeCompile;CoreCompile">
+  <Target Name="_ThisAssemblyCheckCompilerVersion" BeforeTargets="CoreCompile">
 
-    <Error Text="ThisAssembly requires MSBuild 16.8+ or .NET SDK 5.0+."
-            Condition="$([System.Version]::Parse('16.8.0').CompareTo($([System.Version]::Parse($(MSBuildVersion))))) == 1" />
+    <!-- Version comparison functions require MSBuild 16.5+ -->
+    <Error Text="ThisAssembly requires MSBuild 16.5 or greater."
+            Condition="$([System.Version]::Parse('16.5.0').CompareTo($([System.Version]::Parse($(MSBuildVersion))))) == 1" />
 
-    <!-- See https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/compiler-options/langversion-compiler-option -->
-    <Warning Code="THIS001" 
-             Text="ThisAssembly uses Roslyn source generators, which are only supported in C# 9.0 or greater at the moment."
-             Condition="'$(Language)' != 'C#' OR 
-                  ('$(LangVersion)' != 'preview' AND
-                   '$(LangVersion)' != 'latest' AND
-                   '$(LangVersion)' != 'latestMajor' AND
-                   '$(LangVersion)' &lt; '9.0')" />
+    <PropertyGroup>
+      <!-- CompilerApiVersion comes from Microsoft.Managed.Core.CurrentVersions.targets -->
+      <RoslynVersion Condition="'$(CompilerApiVersion)' != ''">$(CompilerApiVersion.Substring(6))</RoslynVersion>
+      <RoslynVersion Condition="'$(RoslynVersion)' == ''">0.0</RoslynVersion>
+    </PropertyGroup>
+
+    <!--  -->
+    <Warning Code="THIS001"
+             Text="ThisAssembly requires Compiler API (Roslyn) version $(ThisAssemblyMinimumRoslynVersion) or greater."
+             Condition="$([MSBuild]::VersionLessThan('$(RoslynVersion)', '$(ThisAssemblyMinimumRoslynVersion)'))" />
   </Target>
 
 </Project>
diff --git a/src/ThisAssembly.Project/ThisAssembly.Project.csproj b/src/ThisAssembly.Project/ThisAssembly.Project.csproj
index 26e0b9fc..bb9048f3 100644
--- a/src/ThisAssembly.Project/ThisAssembly.Project.csproj
+++ b/src/ThisAssembly.Project/ThisAssembly.Project.csproj
@@ -8,7 +8,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly.Project</PackageId>
-    <Description>** C# 9.0+ ONLY **
+    <Description>
 This package generates a static `ThisAssembly.Project` class with public 
 constants exposing project properties that have been opted into this mechanism by adding 
 them as `ProjectProperty` MSBuild items in project file, such as:
diff --git a/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj b/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj
index 3565c5b2..1bcf9f15 100644
--- a/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj
+++ b/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj
@@ -13,7 +13,6 @@
   <PropertyGroup>
     <PackageId>ThisAssembly.Resources</PackageId>
     <Description>
-      ** C# 9.0+ ONLY **
       This package generates a static `ThisAssembly.Resources` class with public
       properties exposing `string` and `Stream` shortcuts to access embedded resources.
     </Description>
diff --git a/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj b/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj
index 8138c1b2..7982c323 100644
--- a/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj
+++ b/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj
@@ -8,7 +8,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly.Strings</PackageId>
-    <Description>** C# 9.0+ ONLY **
+    <Description>
 This package generates a static `ThisAssembly.Strings` class with public 
 constants exposing string resources in .resx files or methods with the right number of 
 parameters for strings that use formatting parameters. 
diff --git a/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj b/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj
index cd2f8d11..cfa29a75 100644
--- a/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj
+++ b/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj
@@ -6,7 +6,6 @@
     <TargetFramework Condition="'$(BuildingInsideVisualStudio)' == 'true'">net472</TargetFramework>
     <RootNamespace>ThisAssemblyTests</RootNamespace>
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
-    <GetTargetPathDependsOn>$(GetTargetPathDependsOn);GetDependencyTargetPaths</GetTargetPathDependsOn>
     <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
   </PropertyGroup>
 
@@ -64,14 +63,6 @@
   <ItemGroup>
     <Compile Include="..\ThisAssembly.Strings\Model.cs" Link="Model.cs" />
   </ItemGroup>
-  
-  <Target Name="GetDependencyTargetPaths" Returns="@(TargetPathWithTargetPlatformMoniker)">
-    <ItemGroup>
-      <!--<TargetPathWithTargetPlatformMoniker Include="$(PKGCsvTextFieldParser)\lib\netstandard2.0\CsvTextFieldParser.dll" IncludeRuntimeDependency="false" />
-      <TargetPathWithTargetPlatformMoniker Include="$(PKGHandlebars_Net)\lib\netstandard2.0\Handlebars.dll" IncludeRuntimeDependency="false" />
-      <TargetPathWithTargetPlatformMoniker Include="$(PKGNewtonsoft_Json)\lib\netstandard2.0\Newtonsoft.Json.dll" IncludeRuntimeDependency="false" />-->
-    </ItemGroup>
-  </Target>
 
   <Import Project="..\*\*.targets" />
 
diff --git a/src/ThisAssembly/ThisAssembly.csproj b/src/ThisAssembly/ThisAssembly.csproj
index c9ec4736..23be382b 100644
--- a/src/ThisAssembly/ThisAssembly.csproj
+++ b/src/ThisAssembly/ThisAssembly.csproj
@@ -8,7 +8,7 @@
 
   <PropertyGroup>
     <PackageId>ThisAssembly</PackageId>
-    <Description>Meta-package that includes all ThisAssembly.* packages. ** C# 9.0 ONLY **</Description>
+    <Description>Meta-package that includes all ThisAssembly.* packages.</Description>
   </PropertyGroup>
 
   <ItemGroup>
@@ -26,11 +26,11 @@
 
   <ItemGroup>
     <ProjectReference Include="..\ThisAssembly.AssemblyInfo\ThisAssembly.AssemblyInfo.csproj" PrivateAssets="none" />
+    <ProjectReference Include="..\ThisAssembly.Constants\ThisAssembly.Constants.csproj" PrivateAssets="none" />
     <ProjectReference Include="..\ThisAssembly.Metadata\ThisAssembly.Metadata.csproj" PrivateAssets="none" />
     <ProjectReference Include="..\ThisAssembly.Project\ThisAssembly.Project.csproj" PrivateAssets="none" />
     <ProjectReference Include="..\ThisAssembly.Resources\ThisAssembly.Resources.csproj" PrivateAssets="none" />
     <ProjectReference Include="..\ThisAssembly.Strings\ThisAssembly.Strings.csproj" PrivateAssets="none" />
-    <ProjectReference Include="..\ThisAssembly.Constants\ThisAssembly.Constants.csproj" PrivateAssets="none" />
   </ItemGroup>
 
 </Project>