diff --git a/framework/src/Volo.Abp.Auditing.Contracts/Volo.Abp.Auditing.Contracts.csproj b/framework/src/Volo.Abp.Auditing.Contracts/Volo.Abp.Auditing.Contracts.csproj
index d926ca6365..15e5befcaa 100644
--- a/framework/src/Volo.Abp.Auditing.Contracts/Volo.Abp.Auditing.Contracts.csproj
+++ b/framework/src/Volo.Abp.Auditing.Contracts/Volo.Abp.Auditing.Contracts.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <AssemblyName>Volo.Abp.Auditing.Contracts</AssemblyName>
         <PackageId>Volo.Abp.Auditing.Contracts</PackageId>
         <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>