diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 8b0b9d42fd..6acb394869 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
+    <LangVersion>9.0</LangVersion>
     <TargetsWindows Condition="'$(OS)' == 'Windows_NT' AND '$(OSGroup)' == ''">true</TargetsWindows>
     <TargetsWindows Condition="'$(OS)' != 'Windows_NT' AND '$(OSGroup)' == ''">false</TargetsWindows>
     <TargetsWindows Condition="'$(OSGroup)' == 'Windows_NT'">true</TargetsWindows>