diff --git a/framework/src/Volo.Abp.Specifications/Volo.Abp.Specifications.csproj b/framework/src/Volo.Abp.Specifications/Volo.Abp.Specifications.csproj
index f6a5b54948..98d2f529e3 100644
--- a/framework/src/Volo.Abp.Specifications/Volo.Abp.Specifications.csproj
+++ b/framework/src/Volo.Abp.Specifications/Volo.Abp.Specifications.csproj
@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.Specifications</AssemblyName>
     <PackageId>Volo.Abp.Specifications</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>