diff --git a/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo.Abp.DistributedLocking.Abstractions.csproj b/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo.Abp.DistributedLocking.Abstractions.csproj
index 7e01d295e7..e53f5b718c 100644
--- a/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo.Abp.DistributedLocking.Abstractions.csproj
+++ b/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo.Abp.DistributedLocking.Abstractions.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <AssemblyName>Volo.Abp.DistributedLocking.Abstractions</AssemblyName>
         <PackageId>Volo.Abp.DistributedLocking.Abstractions</PackageId>
         <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
diff --git a/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/IAbpDistributedLock.cs b/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/IAbpDistributedLock.cs
index 754ae807f8..1d1b5e01db 100644
--- a/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/IAbpDistributedLock.cs
+++ b/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/IAbpDistributedLock.cs
@@ -16,8 +16,7 @@ public interface IAbpDistributedLock
     /// <param name="name">The name of the lock</param>
     /// <param name="timeout">How long to wait before giving up on the acquisition attempt. Defaults to 0</param>
     /// <param name="cancellationToken">Cancellation token</param>
-    [ItemCanBeNull]
-    Task<IAbpDistributedLockHandle> TryAcquireAsync(
+    Task<IAbpDistributedLockHandle?> TryAcquireAsync(
         [NotNull] string name,
         TimeSpan timeout = default,
         CancellationToken cancellationToken = default
diff --git a/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/LocalAbpDistributedLock.cs b/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/LocalAbpDistributedLock.cs
index 490f024d36..58d67e1caf 100644
--- a/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/LocalAbpDistributedLock.cs
+++ b/framework/src/Volo.Abp.DistributedLocking.Abstractions/Volo/Abp/DistributedLocking/LocalAbpDistributedLock.cs
@@ -22,7 +22,7 @@ public class LocalAbpDistributedLock : IAbpDistributedLock, ISingletonDependency
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public async Task<IAbpDistributedLockHandle> TryAcquireAsync(
+    public async Task<IAbpDistributedLockHandle?> TryAcquireAsync(
         string name,
         TimeSpan timeout = default,
         CancellationToken cancellationToken = default)