diff --git a/Directory.Build.targets b/Directory.Build.targets
index 30861be2b59..bc9b533266b 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -3,4 +3,9 @@
   <Import Project="$(RepositoryEngineeringDir)CodeStyle.targets" />
   <Import Project="Sdk.targets" Sdk="Microsoft.DotNet.Arcade.Sdk" />
   <Import Project="$(RepositoryEngineeringDir)versioning.targets" />
+  <!-- to prevent using MS.NC.Platforms from SDK, which is lagging behind the version that WinForms gets from the CoreFx packages -->
+  <ItemGroup>
+    <PackageReference Update="Microsoft.NETCore.Platforms" Version="$(MicrosoftNETCorePlatformsPackageVersion)" />
+  </ItemGroup>
 </Project>
+
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 0ddf07eca0f..12606255c72 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -33,6 +33,10 @@
       <Uri>https://github.com/dotnet/corefx</Uri>
       <Sha>dca39727b02ceb4413d0fde11467965099ab4a2f</Sha>
     </Dependency>
+    <Dependency Name="Microsoft.NETCore.Platforms" Version="4.6.0-preview4.19118.6">
+      <Uri>https://github.com/dotnet/corefx</Uri>
+      <Sha>dca39727b02ceb4413d0fde11467965099ab4a2f</Sha>
+    </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>
     <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="1.0.0-beta.19121.5">
diff --git a/eng/Versions.props b/eng/Versions.props
index 25fce4ca549..b3d930b3089 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -16,6 +16,7 @@
     <SystemCodeDomPackageVersion>4.6.0-preview4.19118.6</SystemCodeDomPackageVersion>
     <SystemSecurityPermissionsPackageVersion>4.6.0-preview4.19118.6</SystemSecurityPermissionsPackageVersion>
     <SystemWindowsExtensionsPackageVersion>4.6.0-preview4.19118.6</SystemWindowsExtensionsPackageVersion>
+    <MicrosoftNETCorePlatformsVersion>4.6.0-preview4.19118.6</MicrosoftNETCorePlatformsVersion>
   </PropertyGroup>
   <PropertyGroup>
     <AccessibilityPackageVersion>4.6.0-alpha-27122-5</AccessibilityPackageVersion>