diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 543c5e59143b..03a62b2a10d4 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -18,13 +18,13 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>8eb29ba860a3cfcfe68f9a8256caa7efc1f1aaba</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Private.CoreFx.NETCoreApp" Version="4.7.0-preview3.19555.2">
+    <Dependency Name="Microsoft.Private.CoreFx.NETCoreApp" Version="4.7.0-preview3.19551.4">
       <Uri>https://github.com/dotnet/corefx</Uri>
-      <Sha>52985c4d5ebda0d1870ee75bd85ba96d7dd7ff1b</Sha>
+      <Sha>046765913dff824f9ed0f2d2fe0fb9b111906cf5</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.Platforms" Version="3.1.0-preview3.19555.2">
+    <Dependency Name="Microsoft.NETCore.Platforms" Version="3.1.0-preview3.19551.4">
       <Uri>https://github.com/dotnet/corefx</Uri>
-      <Sha>52985c4d5ebda0d1870ee75bd85ba96d7dd7ff1b</Sha>
+      <Sha>046765913dff824f9ed0f2d2fe0fb9b111906cf5</Sha>
     </Dependency>
     <Dependency Name="Microsoft.NETCore.App" Version="3.1.0-preview3.19553.2">
       <Uri>https://github.com/dotnet/core-setup</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 7ed271628dd4..a20e6cc9702a 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -21,8 +21,8 @@
     <!-- roslyn -->
     <MicrosoftNetCompilersToolsetVersion>3.3.0-beta2-19367-02</MicrosoftNetCompilersToolsetVersion>
     <!-- corefx -->
-    <MicrosoftPrivateCoreFxNETCoreAppVersion>4.7.0-preview3.19555.2</MicrosoftPrivateCoreFxNETCoreAppVersion>
-    <MicrosoftNETCorePlatformsVersion>3.1.0-preview3.19555.2</MicrosoftNETCorePlatformsVersion>
+    <MicrosoftPrivateCoreFxNETCoreAppVersion>4.7.0-preview3.19551.4</MicrosoftPrivateCoreFxNETCoreAppVersion>
+    <MicrosoftNETCorePlatformsVersion>3.1.0-preview3.19551.4</MicrosoftNETCorePlatformsVersion>
     <MicrosoftBclAsyncInterfacesVersion>1.0.0-preview7.19326.2</MicrosoftBclAsyncInterfacesVersion>
     <!-- core-setup -->
     <MicrosoftNETCoreAppVersion>3.1.0-preview3.19553.2</MicrosoftNETCoreAppVersion>