diff --git a/Benchmarks/Benchmarks.csproj b/Benchmarks/Benchmarks.csproj
index 76bd52d955..596df6577d 100644
--- a/Benchmarks/Benchmarks.csproj
+++ b/Benchmarks/Benchmarks.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks Condition="'$(TestFrameworks)'==''">net8.0</TargetFrameworks>
+    <TargetFrameworks Condition="'$(TestFrameworks)'==''">net6.0</TargetFrameworks>
     <SignAssembly>true</SignAssembly>
     <DefineConstants Condition=" '$(MonoRuntime)' == 'true' ">$(DefineConstants);MONO</DefineConstants>
     <AssemblyOriginatorKeyFile>..\MimeKit\mimekit.snk</AssemblyOriginatorKeyFile>
diff --git a/MimeKit/MimeKit.csproj b/MimeKit/MimeKit.csproj
index e12bcb84dc..30fc7143c3 100644
--- a/MimeKit/MimeKit.csproj
+++ b/MimeKit/MimeKit.csproj
@@ -8,7 +8,7 @@
     <Authors>Jeffrey Stedfast</Authors>
     <_LegacyFrameworks>net462;net47</_LegacyFrameworks>
     <_LegacyFrameworks Condition=" Exists('C:\Windows') ">$(_LegacyFrameworks);net48</_LegacyFrameworks>
-    <TargetFrameworks>$(_LegacyFrameworks);netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
+    <TargetFrameworks>$(_LegacyFrameworks);netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <AssemblyName>MimeKit</AssemblyName>
     <PackageId>MimeKit</PackageId>
diff --git a/UnitTests/UnitTests.csproj b/UnitTests/UnitTests.csproj
index 7934978955..072796a9c7 100644
--- a/UnitTests/UnitTests.csproj
+++ b/UnitTests/UnitTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <LangVersion>10</LangVersion>
     <AssemblyName>UnitTests</AssemblyName>
     <DebugSymbols>true</DebugSymbols>