diff --git a/Test/UnitTests/UnitTests.csproj b/Test/UnitTests/UnitTests.csproj
index 9f78ac2..e3edebf 100644
--- a/Test/UnitTests/UnitTests.csproj
+++ b/Test/UnitTests/UnitTests.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="MSBuild.Sdk.Extras/2.0.43">
   <PropertyGroup>
-    <TargetFrameworks>net45;netcoreapp3.0</TargetFrameworks>
+    <TargetFrameworks>net45;netcoreapp3.0;netcoreapp3.0</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <UseWPF>true</UseWPF>
     <OutputType>Library</OutputType>
@@ -20,5 +20,5 @@
   <ItemGroup>
     <ProjectReference Include="..\..\src\Microsoft.Xaml.Behaviors\Microsoft.Xaml.Behaviors.csproj" />
   </ItemGroup>
-  
+
 </Project>
diff --git a/src/Microsoft.Xaml.Behaviors/Microsoft.Xaml.Behaviors.csproj b/src/Microsoft.Xaml.Behaviors/Microsoft.Xaml.Behaviors.csproj
index 32207d4..46c3a5d 100644
--- a/src/Microsoft.Xaml.Behaviors/Microsoft.Xaml.Behaviors.csproj
+++ b/src/Microsoft.Xaml.Behaviors/Microsoft.Xaml.Behaviors.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="MSBuild.Sdk.Extras/2.0.43">
   <PropertyGroup>
-    <TargetFrameworks>net45;netcoreapp3.0</TargetFrameworks>
+    <TargetFrameworks>net45;netcoreapp3.0;netcoreapp3.1</TargetFrameworks>
     <TargetsForTfmSpecificBuildOutput>$(TargetsForTfmSpecificBuildOutput);IncludeProjectToProjectAssets</TargetsForTfmSpecificBuildOutput>
     <OutputType>Library</OutputType>
     <PackageId>Microsoft.Xaml.Behaviors.Wpf</PackageId>
@@ -35,7 +35,7 @@
     <SignAssembly>true</SignAssembly>
     <DelaySign>true</DelaySign>
   </PropertyGroup>
-  
+
   <ItemGroup Condition="'$(TargetFramework)'=='net45'">
     <Reference Include="System" />
     <Reference Include="System.Core" />