diff --git a/Directory.Build.props b/Directory.Build.props
index e8070a6c..2f74de03 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -4,7 +4,7 @@
   </PropertyGroup>
   <PropertyGroup Label="Target Platforms">
     <LatestSupportedDotNetVersion>net10.0</LatestSupportedDotNetVersion>
-    <OldestSupportedDotNetVersion>net10.0</OldestSupportedDotNetVersion>
+    <OldestSupportedDotNetVersion>net9.0</OldestSupportedDotNetVersion>
     <NetCoreVersions>$(LatestSupportedDotNetVersion)</NetCoreVersions>
     <NetCoreVersions Condition="'$(LatestSupportedDotNetVersion)' != '$(OldestSupportedDotNetVersion)'">$(LatestSupportedDotNetVersion);$(OldestSupportedDotNetVersion)</NetCoreVersions>
     <NetStandardVersions>netstandard2.0</NetStandardVersions>