diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 38468f68ba..5cbb44f047 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -17,13 +17,13 @@
       <Uri>https://dev.azure.com/devdiv/DevDiv/_git/vs-code-coverage</Uri>
       <Sha>413a357aba09b9199f81be9336422ea30bd8082c</Sha>
     </Dependency>
-    <Dependency Name="MSTest" Version="4.2.0-preview.26176.6">
+    <Dependency Name="MSTest" Version="4.2.1-preview.26177.4">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>a6a857248711507fe51224a90eaecef43f436f8c</Sha>
+      <Sha>4bc0cfcc420247cf6111fca7f8e914a9706634dd</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Testing.Platform" Version="2.2.0-preview.26176.6">
+    <Dependency Name="Microsoft.Testing.Platform" Version="2.2.1-preview.26177.4">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>a6a857248711507fe51224a90eaecef43f436f8c</Sha>
+      <Sha>4bc0cfcc420247cf6111fca7f8e914a9706634dd</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>
diff --git a/eng/Versions.props b/eng/Versions.props
index f2695a3914..5a896beb0c 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -10,7 +10,7 @@
     <MicrosoftDotNetBuildTasksTemplatingPackageVersion>11.0.0-beta.26173.2</MicrosoftDotNetBuildTasksTemplatingPackageVersion>
     <MicrosoftTestingExtensionsCodeCoverageVersion>18.6.0-preview.26175.1</MicrosoftTestingExtensionsCodeCoverageVersion>
     <!-- empty line to avoid merge conflicts for darc PRs to update CC and MSTest+MTP -->
-    <MSTestVersion>4.2.0-preview.26176.6</MSTestVersion>
-    <MicrosoftTestingPlatformVersion>2.2.0-preview.26176.6</MicrosoftTestingPlatformVersion>
+    <MSTestVersion>4.2.1-preview.26177.4</MSTestVersion>
+    <MicrosoftTestingPlatformVersion>2.2.1-preview.26177.4</MicrosoftTestingPlatformVersion>
   </PropertyGroup>
 </Project>