diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 66bfcd15a..0466c8368 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -2,33 +2,33 @@
 <Dependencies>
   <ProductDependencies>
     <!-- Winforms / WPF -->
-    <Dependency Name="Microsoft.WindowsDesktop.App" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.WindowsDesktop.App" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.WindowsDesktop.App.Runtime.win-x64" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.WindowsDesktop.App.Runtime.win-x64" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.App" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.NETCore.App" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.App.Ref" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.NETCore.App.Ref" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.DotNetAppHost" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.NETCore.DotNetAppHost" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.DotNetHostResolver" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.NETCore.DotNetHostResolver" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.App.Runtime.win-x64" Version="3.1.0-preview1.19504.15">
+    <Dependency Name="Microsoft.NETCore.App.Runtime.win-x64" Version="3.1.0-preview1.19504.18">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>ea8a25eb0679dc4d940623688189885086286adc</Sha>
+      <Sha>27610507ac04a478c225054699afb20e86cc7881</Sha>
     </Dependency>
     <!-- No new netstandard.library planned for 3.1 timeframe at this time. -->
     <Dependency Name="NETStandard.Library.Ref" Version="2.1.0" Pinned="true">
@@ -36,9 +36,9 @@
       <Sha>7d57652f33493fa022125b7f63aad0d70c52d810</Sha>
     </Dependency>
     <!-- Used to pull in the feed for Microsoft.NETCore.Platforms, but not referenced directly -->
-    <Dependency Name="Microsoft.NETCore.Platforms" Version="3.1.0-preview1.19504.6" CoherentParentDependency="Microsoft.NetCore.App">
+    <Dependency Name="Microsoft.NETCore.Platforms" Version="3.1.0-preview1.19504.8" CoherentParentDependency="Microsoft.NetCore.App">
       <Uri>https://github.com/dotnet/corefx</Uri>
-      <Sha>f969dd277b3288d0ee07d10dacc5dc3613030674</Sha>
+      <Sha>f4137889514bef5b9149e25d6edbaeb66f8beba6</Sha>
     </Dependency>
     <Dependency Name="Microsoft.AspNetCore.App.Ref" Version="3.1.0-preview1.19504.2">
       <Uri>https://github.com/aspnet/AspNetCore</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index c1298ce05..9fb788f78 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -56,22 +56,22 @@
     <MicrosoftNETBuildExtensionsPackageVersion>$(MicrosoftNETSdkPackageVersion)</MicrosoftNETBuildExtensionsPackageVersion>
   </PropertyGroup>
   <PropertyGroup>
-    <MicrosoftNETCoreAppRuntimewinx64PackageVersion>3.1.0-preview1.19504.15</MicrosoftNETCoreAppRuntimewinx64PackageVersion>
-    <MicrosoftNETCoreAppPackageVersion>3.1.0-preview1.19504.15</MicrosoftNETCoreAppPackageVersion>
+    <MicrosoftNETCoreAppRuntimewinx64PackageVersion>3.1.0-preview1.19504.18</MicrosoftNETCoreAppRuntimewinx64PackageVersion>
+    <MicrosoftNETCoreAppPackageVersion>3.1.0-preview1.19504.18</MicrosoftNETCoreAppPackageVersion>
     <MicrosoftNETCoreAppInternalPackageVersion>$(MicrosoftNETCoreAppPackageVersion)</MicrosoftNETCoreAppInternalPackageVersion>
-    <MicrosoftNETCoreDotNetAppHostPackageVersion>3.1.0-preview1.19504.15</MicrosoftNETCoreDotNetAppHostPackageVersion>
-    <MicrosoftNETCoreDotNetHostResolverPackageVersion>3.1.0-preview1.19504.15</MicrosoftNETCoreDotNetHostResolverPackageVersion>
+    <MicrosoftNETCoreDotNetAppHostPackageVersion>3.1.0-preview1.19504.18</MicrosoftNETCoreDotNetAppHostPackageVersion>
+    <MicrosoftNETCoreDotNetHostResolverPackageVersion>3.1.0-preview1.19504.18</MicrosoftNETCoreDotNetHostResolverPackageVersion>
     <SharedHostVersion>$(MicrosoftNETCoreDotNetHostResolverPackageVersion)</SharedHostVersion>
     <HostFxrVersion>$(MicrosoftNETCoreDotNetAppHostPackageVersion)</HostFxrVersion>
-    <MicrosoftNETCoreAppRefPackageVersion>3.1.0-preview1.19504.15</MicrosoftNETCoreAppRefPackageVersion>
+    <MicrosoftNETCoreAppRefPackageVersion>3.1.0-preview1.19504.18</MicrosoftNETCoreAppRefPackageVersion>
     <NetCoreAppTargetingPackVersion>$(MicrosoftNETCoreAppRefPackageVersion)</NetCoreAppTargetingPackVersion>
     <NetCoreAppHostPackVersion>$(MicrosoftNETCoreDotNetAppHostPackageVersion)</NetCoreAppHostPackVersion>
     <NETStandardLibraryRefPackageVersion>2.1.0</NETStandardLibraryRefPackageVersion>
     <WindowsDesktopTargetingPackVersion>$(MicrosoftNETCoreAppRefPackageVersion)</WindowsDesktopTargetingPackVersion>
     <AspNetCoreVersion>$(MicrosoftAspNetCoreAppRuntimeWinX64PackageVersion)</AspNetCoreVersion>
     <AspNetTargetingPackVersion>$(MicrosoftAspNetCoreAppRefPackageVersion)</AspNetTargetingPackVersion>
-    <MicrosoftWindowsDesktopAppRuntimewinx64PackageVersion>3.1.0-preview1.19504.15</MicrosoftWindowsDesktopAppRuntimewinx64PackageVersion>
-    <MicrosoftWindowsDesktopAppPackageVersion>3.1.0-preview1.19504.15</MicrosoftWindowsDesktopAppPackageVersion>
+    <MicrosoftWindowsDesktopAppRuntimewinx64PackageVersion>3.1.0-preview1.19504.18</MicrosoftWindowsDesktopAppRuntimewinx64PackageVersion>
+    <MicrosoftWindowsDesktopAppPackageVersion>3.1.0-preview1.19504.18</MicrosoftWindowsDesktopAppPackageVersion>
     <MicrosoftWindowsDesktopPackageVersion>$(MicrosoftWindowsDesktopAppPackageVersion)</MicrosoftWindowsDesktopPackageVersion>
   </PropertyGroup>
   <PropertyGroup>