diff --git a/framework/src/Volo.Abp.Dapr/Volo.Abp.Dapr.csproj b/framework/src/Volo.Abp.Dapr/Volo.Abp.Dapr.csproj
index f21af371bb..1b952e34cc 100644
--- a/framework/src/Volo.Abp.Dapr/Volo.Abp.Dapr.csproj
+++ b/framework/src/Volo.Abp.Dapr/Volo.Abp.Dapr.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.Dapr/Volo/Abp/Dapr/AbpDaprClientFactory.cs b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprClientFactory.cs
index aa14bbe7f2..43e9dbc953 100644
--- a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprClientFactory.cs
+++ b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprClientFactory.cs
@@ -24,7 +24,7 @@ public class AbpDaprClientFactory : IAbpDaprClientFactory, ISingletonDependency
         JsonSerializerOptions = CreateJsonSerializerOptions(systemTextJsonSerializerOptions.Value);
     }
 
-    public virtual DaprClient Create(Action<DaprClientBuilder> builderAction = null)
+    public virtual DaprClient Create(Action<DaprClientBuilder>? builderAction = null)
     {
         var builder = new DaprClientBuilder()
             .UseJsonSerializationOptions(JsonSerializerOptions);
@@ -51,9 +51,9 @@ public class AbpDaprClientFactory : IAbpDaprClientFactory, ISingletonDependency
     }
 
     public virtual HttpClient CreateHttpClient(
-        string appId = null,
-        string daprEndpoint = null,
-        string daprApiToken = null)
+        string? appId = null,
+        string? daprEndpoint = null,
+        string? daprApiToken = null)
     {
         if(daprEndpoint.IsNullOrWhiteSpace() &&
            !DaprOptions.HttpEndpoint.IsNullOrWhiteSpace())
diff --git a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprModule.cs b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprModule.cs
index 4153ae2ec1..e1ca4bb0db 100644
--- a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprModule.cs
+++ b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprModule.cs
@@ -33,14 +33,14 @@ public class AbpDaprModule : AbpModule
                 var confEnv = configuration["DAPR_API_TOKEN"];
                 if (!confEnv.IsNullOrWhiteSpace())
                 {
-                    options.DaprApiToken = confEnv;
+                    options.DaprApiToken = confEnv!;
                 }
                 else
                 {
                     var env = Environment.GetEnvironmentVariable("DAPR_API_TOKEN");
                     if (!env.IsNullOrWhiteSpace())
                     {
-                        options.DaprApiToken = env;
+                        options.DaprApiToken = env!;
                     }
                 }
             }
@@ -50,14 +50,14 @@ public class AbpDaprModule : AbpModule
                 var confEnv = configuration["APP_API_TOKEN"];
                 if (!confEnv.IsNullOrWhiteSpace())
                 {
-                    options.AppApiToken = confEnv;
+                    options.AppApiToken = confEnv!;
                 }
                 else
                 {
                     var env = Environment.GetEnvironmentVariable("APP_API_TOKEN");
                     if (!env.IsNullOrWhiteSpace())
                     {
-                        options.AppApiToken = env;
+                        options.AppApiToken = env!;
                     }
                 }
             }
diff --git a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprOptions.cs b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprOptions.cs
index 7ac19ad31c..f436f35147 100644
--- a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprOptions.cs
+++ b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/AbpDaprOptions.cs
@@ -2,11 +2,11 @@
 
 public class AbpDaprOptions
 {
-    public string HttpEndpoint { get; set; }
+    public string? HttpEndpoint { get; set; }
 
-    public string GrpcEndpoint { get; set; }
+    public string? GrpcEndpoint { get; set; }
     
-    public string DaprApiToken { get; set; }
+    public string? DaprApiToken { get; set; }
     
-    public string AppApiToken { get; set; }
+    public string? AppApiToken { get; set; }
 }
\ No newline at end of file
diff --git a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/DaprApiTokenProvider.cs b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/DaprApiTokenProvider.cs
index 10dd3913ed..c38f36bf10 100644
--- a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/DaprApiTokenProvider.cs
+++ b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/DaprApiTokenProvider.cs
@@ -12,12 +12,12 @@ public class DaprApiTokenProvider : IDaprApiTokenProvider, ISingletonDependency
         Options = options.Value;
     }
 
-    public virtual string GetDaprApiToken()
+    public virtual string? GetDaprApiToken()
     {
         return Options.DaprApiToken;
     }
 
-    public virtual string GetAppApiToken()
+    public virtual string? GetAppApiToken()
     {
         return Options.AppApiToken;
     }
diff --git a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IAbpDaprClientFactory.cs b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IAbpDaprClientFactory.cs
index 65c4e76b7e..bbf074af6c 100644
--- a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IAbpDaprClientFactory.cs
+++ b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IAbpDaprClientFactory.cs
@@ -6,11 +6,11 @@ namespace Volo.Abp.Dapr;
 
 public interface IAbpDaprClientFactory
 {
-    DaprClient Create(Action<DaprClientBuilder> builderAction = null);
+    DaprClient Create(Action<DaprClientBuilder>? builderAction = null);
 
     HttpClient CreateHttpClient(
-        string appId = null,
-        string daprEndpoint = null,
-        string daprApiToken = null
+        string? appId = null,
+        string? daprEndpoint = null,
+        string? daprApiToken = null
     );
 }
diff --git a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IDaprApiTokenProvider.cs b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IDaprApiTokenProvider.cs
index 60f2195596..5e153ba2ea 100644
--- a/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IDaprApiTokenProvider.cs
+++ b/framework/src/Volo.Abp.Dapr/Volo/Abp/Dapr/IDaprApiTokenProvider.cs
@@ -2,7 +2,7 @@ namespace Volo.Abp.Dapr;
 
 public interface IDaprApiTokenProvider
 {
-    string GetDaprApiToken();
+    string? GetDaprApiToken();
 
-    string GetAppApiToken();
+    string? GetAppApiToken();
 }