diff --git a/lang/csharp/versions.props b/lang/csharp/versions.props
index 15dae9ce5a4..7d7cea666e5 100644
--- a/lang/csharp/versions.props
+++ b/lang/csharp/versions.props
@@ -27,7 +27,7 @@
   -->
   <PropertyGroup Label="Latest Package Versions">
     <NewtonsoftJsonVersion>13.0.1</NewtonsoftJsonVersion>
-    <SystemCodeDomVersion>8.0.0</SystemCodeDomVersion>
+    <SystemCodeDomVersion>9.0.9</SystemCodeDomVersion>
     <SystemReflectionVersion>4.3.0</SystemReflectionVersion>
     <SystemReflectionEmitILGenerationVersion>4.7.0</SystemReflectionEmitILGenerationVersion>
     <SystemReflectionEmitLightweightVersion>4.7.0</SystemReflectionEmitLightweightVersion>