diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions.csproj b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions.csproj
index 97d5b8b2a3..466589a027 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions.csproj
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleConfigurationCollection.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleConfigurationCollection.cs
index b972ae0840..36e981e698 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleConfigurationCollection.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleConfigurationCollection.cs
@@ -27,7 +27,7 @@ public class BundleConfigurationCollection
     /// <returns>Returns this object for chained calls.</returns>
     public BundleConfigurationCollection Add(
         [NotNull] string bundleName,
-        [CanBeNull] Action<BundleConfiguration> configureAction = null)
+        Action<BundleConfiguration>? configureAction = null)
     {
         if (!TryAdd(bundleName, configureAction))
         {
@@ -52,7 +52,7 @@ public class BundleConfigurationCollection
     /// <returns>Returns true if added. Returns false if it's already added before.</returns>
     public bool TryAdd(
         [NotNull] string bundleName,
-        [CanBeNull] Action<BundleConfiguration> configureAction = null,
+        Action<BundleConfiguration>? configureAction = null,
         bool overrideIfExists = false)
     {
         Check.NotNull(bundleName, nameof(bundleName));
@@ -78,7 +78,7 @@ public class BundleConfigurationCollection
         return true;
     }
 
-    private BundleConfiguration CreateBundle(string bundleName, Action<BundleConfiguration> configureAction)
+    private BundleConfiguration CreateBundle(string bundleName, Action<BundleConfiguration>? configureAction)
     {
         var bundle = new BundleConfiguration(bundleName);
 
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleContributorCollection.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleContributorCollection.cs
index 32dd23a6ee..5f245c1827 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleContributorCollection.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling.Abstractions/Volo/Abp/AspNetCore/Mvc/UI/Bundling/BundleContributorCollection.cs
@@ -54,7 +54,7 @@ public class BundleContributorCollection
         if (!includeDependencies)
         {
             _contributors.ReplaceOne(x => x.GetType() == sourceContributorType,
-                contributor => (IBundleContributor)Activator.CreateInstance(destContributorType));
+                contributor => (IBundleContributor)Activator.CreateInstance(destContributorType)!);
         }
         else
         {
@@ -131,7 +131,7 @@ public class BundleContributorCollection
 
         try
         {
-            _contributors.Add((IBundleContributor)Activator.CreateInstance(contributorType));
+            _contributors.Add((IBundleContributor)Activator.CreateInstance(contributorType)!);
         }
         catch (Exception ex)
         {