diff --git a/Management/Vanara.Management.csproj b/Management/Vanara.Management.csproj
index 12c240c3..6fa5f5ea 100644
--- a/Management/Vanara.Management.csproj
+++ b/Management/Vanara.Management.csproj
@@ -18,9 +18,10 @@ DynamicMgmtObject, ManagementExtensions
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' != 'net45' ">
-    <PackageReference Include="System.Management" Version="7.0.0" />
+    <PackageReference Include="System.Management" Version="6.0.0" Condition=" '$(TargetFramework)' == 'netcoreapp3.1' " />
+    <PackageReference Include="System.Management" Version="7.0.0" Condition=" '$(TargetFramework)' != 'netcoreapp3.1' " />
   </ItemGroup>
-  <ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <Reference Include="System.Management" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/Security/Vanara.Security.csproj b/Security/Vanara.Security.csproj
index 6a61453a..2cb9adba 100644
--- a/Security/Vanara.Security.csproj
+++ b/Security/Vanara.Security.csproj
@@ -25,7 +25,8 @@ AccountLogonRights, DesiredAccess, SystemPrivilege
     </When>
     <Otherwise>
       <ItemGroup>
-        <PackageReference Include="System.DirectoryServices" Version="7.0.0" />
+        <PackageReference Include="System.DirectoryServices" Version="6.0.0" Condition=" '$(TargetFramework)' == 'netcoreapp3.1' " />
+        <PackageReference Include="System.DirectoryServices" Version="7.0.0" Condition=" '$(TargetFramework)' != 'netcoreapp3.1' " />
       </ItemGroup>
     </Otherwise>
   </Choose>
diff --git a/UnitTests/PInvoke/NTDSApi/NTDSApi.csproj b/UnitTests/PInvoke/NTDSApi/NTDSApi.csproj
index 275dcee4..8efad490 100644
--- a/UnitTests/PInvoke/NTDSApi/NTDSApi.csproj
+++ b/UnitTests/PInvoke/NTDSApi/NTDSApi.csproj
@@ -2,9 +2,19 @@
   <PropertyGroup>
     <AssemblyName>UnitTest.PInvoke.NTDSApi</AssemblyName>
   </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="System.DirectoryServices" />
-  </ItemGroup>
+  <Choose>
+    <When Condition=" $(TargetFramework.StartsWith('net4')) ">
+      <ItemGroup>
+        <Reference Include="System.DirectoryServices" />
+      </ItemGroup>
+    </When>
+    <Otherwise>
+      <ItemGroup>
+        <PackageReference Include="System.DirectoryServices" Version="6.0.0" Condition=" '$(TargetFramework)' == 'netcoreapp3.1' " />
+        <PackageReference Include="System.DirectoryServices" Version="7.0.0" Condition=" '$(TargetFramework)' != 'netcoreapp3.1' " />
+      </ItemGroup>
+    </Otherwise>
+  </Choose>
   <ItemGroup>
     <ProjectReference Include="..\..\..\PInvoke\NetApi32\Vanara.PInvoke.NetApi32.csproj" />
     <ProjectReference Include="..\..\..\PInvoke\NTDSApi\Vanara.PInvoke.NTDSApi.csproj" />
diff --git a/VirtualDisk/Vanara.VirtualDisk.csproj b/VirtualDisk/Vanara.VirtualDisk.csproj
index 3f9c1fb7..6e928587 100644
--- a/VirtualDisk/Vanara.VirtualDisk.csproj
+++ b/VirtualDisk/Vanara.VirtualDisk.csproj
@@ -19,8 +19,13 @@ CompactionMode, DeviceType, Subtype
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="System.IO.FileSystem.AccessControl" Version="5.0.0" Condition=" $(TargetFramework.StartsWith('netstandard')) Or $(TargetFramework.StartsWith('netcore')) Or $(TargetFramework.StartsWith('net5')) " />
-    <PackageReference Include="System.Management" Version="5.0.0" Condition=" '$(TargetFramework)' == 'net45' " />
-    <PackageReference Include="System.Management" Version="7.0.0" Condition=" '$(TargetFramework)' != 'net45' " />
+  </ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' != 'net45' ">
+    <PackageReference Include="System.Management" Version="6.0.0" Condition=" '$(TargetFramework)' == 'netcoreapp3.1' " />
+    <PackageReference Include="System.Management" Version="7.0.0" Condition=" '$(TargetFramework)' != 'netcoreapp3.1' " />
+  </ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
+    <Reference Include="System.Management" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Management\Vanara.Management.csproj" />