diff --git a/root_VS2017/programs/CS/Samples4NetCore/Legacy/Bat_sample/SimpleBatch_sample/SimpleBatch_sample.csproj b/root_VS2017/programs/CS/Samples4NetCore/Legacy/Bat_sample/SimpleBatch_sample/SimpleBatch_sample.csproj
index c046297c..df7b8c7c 100644
--- a/root_VS2017/programs/CS/Samples4NetCore/Legacy/Bat_sample/SimpleBatch_sample/SimpleBatch_sample.csproj
+++ b/root_VS2017/programs/CS/Samples4NetCore/Legacy/Bat_sample/SimpleBatch_sample/SimpleBatch_sample.csproj
@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="3.3.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.2.0" />