diff --git a/ChessDotCore.Variants/ChessDotCore.Variants.csproj b/ChessDotCore.Variants/ChessDotCore.Variants.csproj
index 64e37c9..434662c 100644
--- a/ChessDotCore.Variants/ChessDotCore.Variants.csproj
+++ b/ChessDotCore.Variants/ChessDotCore.Variants.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
     <SignAssembly>false</SignAssembly>
     <AssemblyOriginatorKeyFile>ChessDotCoreVariantsKey.snk</AssemblyOriginatorKeyFile>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
diff --git a/ChessDotCore/ChessDotCore.csproj b/ChessDotCore/ChessDotCore.csproj
index 5018870..5f6229e 100644
--- a/ChessDotCore/ChessDotCore.csproj
+++ b/ChessDotCore/ChessDotCore.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
     <SignAssembly>false</SignAssembly>
     <AssemblyOriginatorKeyFile>ChessDotCoreKey.snk</AssemblyOriginatorKeyFile>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>