diff --git a/by-language/csharp-npgsql/demo.csproj b/by-language/csharp-npgsql/demo.csproj
index 129d1894..015b257e 100644
--- a/by-language/csharp-npgsql/demo.csproj
+++ b/by-language/csharp-npgsql/demo.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net7.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net7.0</TargetFrameworks>
     <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>