diff --git a/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj b/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj
index 5500c4ddc8..8dbe6d3ba1 100644
--- a/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj
+++ b/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj
@@ -1,14 +1,14 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Configuration.KeyPerFile.netstandard2.0.cs" />
     <Reference Include="Microsoft.Extensions.Configuration"  />
     <Reference Include="Microsoft.Extensions.FileProviders.Physical"  />
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Configuration.KeyPerFile.netcoreapp.cs" />
     <Reference Include="Microsoft.Extensions.Configuration"  />
     <Reference Include="Microsoft.Extensions.FileProviders.Physical"  />
diff --git a/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj b/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj
index 355c5b738e..89cba5ba57 100644
--- a/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj
+++ b/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj
@@ -1,13 +1,13 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.FileProviders.Embedded.netstandard2.0.cs" />
     <Reference Include="Microsoft.Extensions.FileProviders.Abstractions"  />
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.FileProviders.Embedded.netcoreapp.cs" />
     <Reference Include="Microsoft.Extensions.FileProviders.Abstractions"  />
   </ItemGroup>
diff --git a/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj b/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj
index e09ee43981..6b67a08686 100644
--- a/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj
+++ b/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj
@@ -1,13 +1,13 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.netstandard2.0.cs" />
     
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.netcoreapp.cs" />
     
   </ItemGroup>
diff --git a/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj b/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj
index a2080b28d3..83dae521fb 100644
--- a/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj
+++ b/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj
@@ -1,7 +1,7 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.netstandard2.0.cs" />
@@ -9,7 +9,7 @@
     <Reference Include="Microsoft.Extensions.Hosting.Abstractions"  />
     <Reference Include="Microsoft.Extensions.Options"  />
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.netcoreapp.cs" />
     <Reference Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions"  />
     <Reference Include="Microsoft.Extensions.Hosting.Abstractions"  />
diff --git a/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj b/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj
index 3c07525347..ceb24636ab 100644
--- a/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj
+++ b/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj
@@ -1,13 +1,13 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.JSInterop.netstandard2.0.cs" />
     <Reference Include="System.Text.Json"  />
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.JSInterop.netcoreapp.cs" />
     
   </ItemGroup>
diff --git a/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj b/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj
index c45066d3cb..af97cae594 100644
--- a/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj
+++ b/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj
@@ -1,13 +1,13 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Localization.Abstractions.netstandard2.0.cs" />
     
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Localization.Abstractions.netcoreapp.cs" />
     
   </ItemGroup>
diff --git a/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj b/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj
index b6df43f5db..67e8f38f89 100644
--- a/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj
+++ b/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj
@@ -1,7 +1,7 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Localization.netstandard2.0.cs" />
@@ -10,7 +10,7 @@
     <Reference Include="Microsoft.Extensions.Localization.Abstractions"  />
     <Reference Include="Microsoft.Extensions.Logging.Abstractions"  />
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Localization.netcoreapp.cs" />
     <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  />
     <Reference Include="Microsoft.Extensions.Options"  />
diff --git a/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj b/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj
index 283cb96e98..5beee97dd6 100644
--- a/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj
+++ b/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj
@@ -1,7 +1,7 @@
 <!-- This file is automatically generated. -->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.WebEncoders.netstandard2.0.cs" />
@@ -9,7 +9,7 @@
     <Reference Include="Microsoft.Extensions.Options"  />
     <Reference Include="System.Text.Encodings.Web"  />
   </ItemGroup>
-<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+<ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.WebEncoders.netcoreapp.cs" />
     <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  />
     <Reference Include="Microsoft.Extensions.Options"  />