diff --git a/lang/csharp/versions.props b/lang/csharp/versions.props
index d5793604958..c73b7948176 100644
--- a/lang/csharp/versions.props
+++ b/lang/csharp/versions.props
@@ -55,7 +55,7 @@
     <MicrosoftBuildFrameworkVersion>16.8.0</MicrosoftBuildFrameworkVersion>
     <MicrosoftBuildUtilitiesCoreVersion>16.8.0</MicrosoftBuildUtilitiesCoreVersion>
     <MicrosoftCodeAnalysisNetAnalyzersVersion>5.0.3</MicrosoftCodeAnalysisNetAnalyzersVersion>
-    <MicrosoftNETTestSdkVersion>16.8.3</MicrosoftNETTestSdkVersion>
+    <MicrosoftNETTestSdkVersion>16.9.1</MicrosoftNETTestSdkVersion>
     <NUnitVersion>3.13.1</NUnitVersion>
     <NUnitConsoleRunnerVersion>3.12.0</NUnitConsoleRunnerVersion>
     <NUnit3TestAdapterVersion>3.17.0</NUnit3TestAdapterVersion>