diff --git a/src/CycloneDX.Core/CycloneDX.Core.csproj b/src/CycloneDX.Core/CycloneDX.Core.csproj
index 3ea6180f..2d4bc3f2 100644
--- a/src/CycloneDX.Core/CycloneDX.Core.csproj
+++ b/src/CycloneDX.Core/CycloneDX.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>netstandard2.0;net5.0</TargetFramework>
     <Product>CycloneDX.Core</Product>
     <Description>A .NET Standard library for CycloneDX bill-of-material documents.</Description>
     <PackageId>CycloneDX.Core</PackageId>
@@ -15,9 +15,12 @@
     <PackageReference Include="JsonSchema.Net" Version="3.3.2" />
     <PackageReference Include="protobuf-net" Version="3.2.26" />
     <PackageReference Include="protobuf-net.BuildTools" Version="3.2.12" PrivateAssets="all" IncludeAssets="runtime;build;native;contentfiles;analyzers;buildtransitive" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <PackageReference Include="System.Text.Json" Version="7.0.2" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <EmbeddedResource Include="Schemas\*" />
   </ItemGroup>