diff --git a/src/NUnitEngine/nunit.engine.tests/Helpers/ShadowCopyUtils.cs b/src/NUnitEngine/nunit.engine.tests/Helpers/ShadowCopyUtils.cs
index 771491452..dd1d3a9a0 100644
--- a/src/NUnitEngine/nunit.engine.tests/Helpers/ShadowCopyUtils.cs
+++ b/src/NUnitEngine/nunit.engine.tests/Helpers/ShadowCopyUtils.cs
@@ -1,5 +1,6 @@
 // Copyright (c) Charlie Poole, Rob Prouse and Contributors. MIT License - see LICENSE.txt
 
+#if NETFRAMEWORK
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -40,3 +41,4 @@ from assemblyName in assemblyNames
         }
     }
 }
+#endif
\ No newline at end of file
diff --git a/src/NUnitEngine/nunit.engine.tests/Integration/DirectoryWithNeededAssemblies.cs b/src/NUnitEngine/nunit.engine.tests/Integration/DirectoryWithNeededAssemblies.cs
index 23afea7e2..547e42c3c 100644
--- a/src/NUnitEngine/nunit.engine.tests/Integration/DirectoryWithNeededAssemblies.cs
+++ b/src/NUnitEngine/nunit.engine.tests/Integration/DirectoryWithNeededAssemblies.cs
@@ -1,5 +1,6 @@
 // Copyright (c) Charlie Poole, Rob Prouse and Contributors. MIT License - see LICENSE.txt
 
+#if NETFRAMEWORK
 using System;
 using System.IO;
 using NUnit.Engine.Tests.Helpers;
@@ -31,3 +32,4 @@ public void Dispose()
         }
     }
 }
+#endif
\ No newline at end of file
diff --git a/src/NUnitEngine/nunit.engine.tests/Integration/MockAssemblyInDirectoryWithFramework.cs b/src/NUnitEngine/nunit.engine.tests/Integration/MockAssemblyInDirectoryWithFramework.cs
index 1e59a7939..d59b5cde8 100644
--- a/src/NUnitEngine/nunit.engine.tests/Integration/MockAssemblyInDirectoryWithFramework.cs
+++ b/src/NUnitEngine/nunit.engine.tests/Integration/MockAssemblyInDirectoryWithFramework.cs
@@ -1,5 +1,6 @@
 // Copyright (c) Charlie Poole, Rob Prouse and Contributors. MIT License - see LICENSE.txt
 
+#if NETFRAMEWORK
 using System;
 using System.IO;
 using NUnit.Framework;
@@ -25,3 +26,4 @@ public void Dispose()
         }
     }
 }
+#endif
\ No newline at end of file
diff --git a/src/NUnitEngine/nunit.engine.tests/Integration/RunnerInDirectoryWithoutFramework.cs b/src/NUnitEngine/nunit.engine.tests/Integration/RunnerInDirectoryWithoutFramework.cs
index b7f5ddf69..088a02a1e 100644
--- a/src/NUnitEngine/nunit.engine.tests/Integration/RunnerInDirectoryWithoutFramework.cs
+++ b/src/NUnitEngine/nunit.engine.tests/Integration/RunnerInDirectoryWithoutFramework.cs
@@ -1,5 +1,6 @@
 // Copyright (c) Charlie Poole, Rob Prouse and Contributors. MIT License - see LICENSE.txt
 
+#if NETFRAMEWORK
 using System;
 using System.IO;
 using System.Threading;
@@ -39,3 +40,4 @@ public void Dispose()
         }
     }
 }
+#endif
\ No newline at end of file
diff --git a/src/NUnitEngine/nunit.engine.tests/nunit.engine.tests.csproj b/src/NUnitEngine/nunit.engine.tests/nunit.engine.tests.csproj
index 23ac9be3f..3398bbcd8 100644
--- a/src/NUnitEngine/nunit.engine.tests/nunit.engine.tests.csproj
+++ b/src/NUnitEngine/nunit.engine.tests/nunit.engine.tests.csproj
@@ -2,7 +2,7 @@
   
   <PropertyGroup>
     <RootNamespace>NUnit.Engine.Tests</RootNamespace>
-    <TargetFrameworks>net462;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net462;netcoreapp3.1;net6.0;net8.0</TargetFrameworks>
     <OutputType>Exe</OutputType>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\nunit.snk</AssemblyOriginatorKeyFile>
@@ -23,7 +23,7 @@
     <PackageReference Include="NSubstitute" Version="2.0.3" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='net462'">
+  <ItemGroup Condition="'$(TargetFramework)'!='netcoreapp3.1'">
     <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnitLite" Version="4.2.2" />
     <PackageReference Include="NSubstitute" Version="5.1.0" />
diff --git a/src/NUnitEngine/nunit.engine/Runners/TestEventDispatcher.cs b/src/NUnitEngine/nunit.engine/Runners/TestEventDispatcher.cs
index 316d98381..ce623a191 100644
--- a/src/NUnitEngine/nunit.engine/Runners/TestEventDispatcher.cs
+++ b/src/NUnitEngine/nunit.engine/Runners/TestEventDispatcher.cs
@@ -33,6 +33,9 @@ public void OnTestEvent(string report)
             }
         }
 
+#if NET6_0 || NET8_0
+        [Obsolete]
+#endif
         public override object InitializeLifetimeService()
         {
             return null;
diff --git a/src/NUnitEngine/nunit.engine/nunit.engine.csproj b/src/NUnitEngine/nunit.engine/nunit.engine.csproj
index ab802c56e..040bd46fe 100644
--- a/src/NUnitEngine/nunit.engine/nunit.engine.csproj
+++ b/src/NUnitEngine/nunit.engine/nunit.engine.csproj
@@ -2,7 +2,7 @@
   
   <PropertyGroup>
     <RootNamespace>NUnit.Engine</RootNamespace>
-    <TargetFrameworks>net462;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net462;netstandard2.0;net6.0;net8.0</TargetFrameworks>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\nunit.snk</AssemblyOriginatorKeyFile>
     <DebugType>portable</DebugType>