diff --git a/MimeKit/MimeKit.csproj b/MimeKit/MimeKit.csproj
index e434ca9333..2ce81c37e5 100644
--- a/MimeKit/MimeKit.csproj
+++ b/MimeKit/MimeKit.csproj
@@ -8,11 +8,11 @@
     <Authors>Jeffrey Stedfast</Authors>
     <_LegacyFrameworks>net462;net47</_LegacyFrameworks>
     <_LegacyFrameworks Condition=" Exists('C:\Windows') ">$(_LegacyFrameworks);net48</_LegacyFrameworks>
-    <TargetFrameworks>$(_LegacyFrameworks);netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>$(_LegacyFrameworks);netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <AssemblyName>MimeKit</AssemblyName>
     <PackageId>MimeKit</PackageId>
-    <PackageTags>mime;encryption;dkim;security;smime;s/mime;openpgp;pgp;mbox;email;parser;tnef;net462;net47;net48;net6.0;net8.0;netstandard;netstandard2.0;netstandard2.1</PackageTags>
+    <PackageTags>mime;encryption;dkim;security;smime;s/mime;openpgp;pgp;mbox;email;parser;tnef;net462;net47;net48;net8.0;netstandard;netstandard2.0;netstandard2.1</PackageTags>
     <PackageProjectUrl>https://github.com/jstedfast/MimeKit</PackageProjectUrl>
     <PackageLicenseUrl>https://github.com/jstedfast/MimeKit/blob/master/License.md</PackageLicenseUrl>
     <GenerateAssemblyTitleAttribute>false</GenerateAssemblyTitleAttribute>
diff --git a/MimeKit/MimeKitLite.csproj b/MimeKit/MimeKitLite.csproj
index b74fd413b1..205c80ce5a 100644
--- a/MimeKit/MimeKitLite.csproj
+++ b/MimeKit/MimeKitLite.csproj
@@ -8,11 +8,11 @@
     <Authors>Jeffrey Stedfast</Authors>
     <_LegacyFrameworks>net462;net47</_LegacyFrameworks>
     <_LegacyFrameworks Condition=" Exists('C:\Windows') ">$(_LegacyFrameworks);net48</_LegacyFrameworks>
-    <TargetFrameworks>$(_LegacyFrameworks);netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>$(_LegacyFrameworks);netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <AssemblyName>MimeKitLite</AssemblyName>
     <PackageId>MimeKitLite</PackageId>
-    <PackageTags>mime;mbox;mail;email;parser;tnef;net462;net47;net48;net6.0;net8.0;netstandard;netstandard2.0</PackageTags>
+    <PackageTags>mime;mbox;mail;email;parser;tnef;net462;net47;net48;net8.0;netstandard;netstandard2.0</PackageTags>
     <PackageProjectUrl>https://github.com/jstedfast/MimeKit</PackageProjectUrl>
     <PackageLicenseUrl>https://github.com/jstedfast/MimeKit/blob/master/License.md</PackageLicenseUrl>
     <GenerateAssemblyTitleAttribute>false</GenerateAssemblyTitleAttribute>
diff --git a/UnitTests/UnitTests.csproj b/UnitTests/UnitTests.csproj
index bee62015bf..b14efe701d 100644
--- a/UnitTests/UnitTests.csproj
+++ b/UnitTests/UnitTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <LangVersion>10</LangVersion>
     <AssemblyName>UnitTests</AssemblyName>
     <DebugSymbols>true</DebugSymbols>
diff --git a/nuget/MimeKit.nuspec b/nuget/MimeKit.nuspec
index e26195bd82..a59217d62f 100644
--- a/nuget/MimeKit.nuspec
+++ b/nuget/MimeKit.nuspec
@@ -30,7 +30,7 @@
     </releaseNotes>
     <copyright>.NET Foundation and Contributors</copyright>
     <language>en-US</language>
-    <tags>mime encryption arc dkim security smime s/mime openpgp pgp mbox mail email parser tnef net462 net47 net48 net6.0 net8.0 netstandard netstandard2.0 netstandard2.1</tags>
+    <tags>mime encryption arc dkim security smime s/mime openpgp pgp mbox mail email parser tnef net462 net47 net48 net8.0 netstandard netstandard2.0 netstandard2.1</tags>
     <readme>docs\README.md</readme>
     <frameworkAssemblies>
       <frameworkAssembly assemblyName="System" targetFramework=".NETFramework4.6.2" />
@@ -71,11 +71,6 @@
         <dependency id="System.Memory" version="4.5.5" />
         <dependency id="BouncyCastle.Cryptography" version="2.4.0" />
       </group>
-      <group targetFramework="net6.0">
-        <dependency id="System.Security.Cryptography.Pkcs" version="8.0.1" />
-        <dependency id="System.Formats.Asn1" version="8.0.1" />
-        <dependency id="BouncyCastle.Cryptography" version="2.4.0" />
-      </group>
       <group targetFramework="net8.0">
         <dependency id="System.Security.Cryptography.Pkcs" version="8.0.1" />
         <dependency id="System.Formats.Asn1" version="8.0.1" />
@@ -125,10 +120,6 @@
     <file src="..\MimeKit\bin\Release\net48\MimeKit.pdb" target="lib\net48\MimeKit.pdb" />
     <file src="..\MimeKit\bin\Release\net48\MimeKit.xml" target="lib\net48\MimeKit.xml" />
     <file src="..\MimeKit\bin\Release\net48\MimeKit.dll.config" target="lib\net48\MimeKit.dll.config" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKit.dll" target="lib\net6.0\MimeKit.dll" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKit.pdb" target="lib\net6.0\MimeKit.pdb" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKit.xml" target="lib\net6.0\MimeKit.xml" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKit.dll.config" target="lib\net6.0\MimeKit.dll.config" />
     <file src="..\MimeKit\bin\Release\net8.0\MimeKit.dll" target="lib\net8.0\MimeKit.dll" />
     <file src="..\MimeKit\bin\Release\net8.0\MimeKit.pdb" target="lib\net8.0\MimeKit.pdb" />
     <file src="..\MimeKit\bin\Release\net8.0\MimeKit.xml" target="lib\net8.0\MimeKit.xml" />
diff --git a/nuget/MimeKitLite.nuspec b/nuget/MimeKitLite.nuspec
index a7f24fc23a..dcdeee0d19 100644
--- a/nuget/MimeKitLite.nuspec
+++ b/nuget/MimeKitLite.nuspec
@@ -30,7 +30,7 @@
     </releaseNotes>
     <copyright>.NET Foundation and Contributors</copyright>
     <language>en-US</language>
-    <tags>mime mbox mail email parser tnef net462 net47 net48 net6.0 net8.0 netstandard netstandard2.0 netstandard2.1</tags>
+    <tags>mime mbox mail email parser tnef net462 net47 net48 net8.0 netstandard netstandard2.0 netstandard2.1</tags>
     <readme>docs\README.md</readme>
     <frameworkAssemblies>
       <frameworkAssembly assemblyName="System" targetFramework=".NETFramework4.6.2" />
@@ -59,7 +59,6 @@
         <dependency id="System.Buffers" version="4.6.0" />
         <dependency id="System.Memory" version="4.5.5" />
       </group>
-      <group targetFramework="net6.0" />
       <group targetFramework="net8.0" />
       <group targetFramework="netstandard2.0">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.1.0" />
@@ -100,10 +99,6 @@
     <file src="..\MimeKit\bin\Release\net48\MimeKitLite.pdb" target="lib\net48\MimeKitLite.pdb" />
     <file src="..\MimeKit\bin\Release\net48\MimeKitLite.xml" target="lib\net48\MimeKitLite.xml" />
     <file src="..\MimeKit\bin\Release\net48\MimeKitLite.dll.config" target="lib\net48\MimeKitLite.dll.config" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKitLite.dll" target="lib\net6.0\MimeKitLite.dll" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKitLite.pdb" target="lib\net6.0\MimeKitLite.pdb" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKitLite.xml" target="lib\net6.0\MimeKitLite.xml" />
-    <file src="..\MimeKit\bin\Release\net6.0\MimeKitLite.dll.config" target="lib\net6.0\MimeKitLite.dll.config" />
     <file src="..\MimeKit\bin\Release\net8.0\MimeKitLite.dll" target="lib\net8.0\MimeKitLite.dll" />
     <file src="..\MimeKit\bin\Release\net8.0\MimeKitLite.pdb" target="lib\net8.0\MimeKitLite.pdb" />
     <file src="..\MimeKit\bin\Release\net8.0\MimeKitLite.xml" target="lib\net8.0\MimeKitLite.xml" />