diff --git a/src/api/config.rs b/src/api/config.rs
index 6759b8e..da897ed 100644
--- a/src/api/config.rs
+++ b/src/api/config.rs
@@ -87,7 +87,7 @@ pub trait ConfigService {
 
 #[cfg(feature = "async")]
 #[async_trait::async_trait]
-pub trait ConfigService {
+pub trait ConfigService: Send + Sync {
     /// Get config, return the content.
     ///
     /// Attention to [`error::Error::ConfigNotFound`], [`error::Error::ConfigQueryConflict`]
diff --git a/src/api/naming.rs b/src/api/naming.rs
index 702acec..f13ee0d 100644
--- a/src/api/naming.rs
+++ b/src/api/naming.rs
@@ -217,7 +217,7 @@ pub trait NamingService {
 
 #[cfg(feature = "async")]
 #[async_trait::async_trait]
-pub trait NamingService {
+pub trait NamingService: Send + Sync {
     async fn register_instance(
         &self,
         service_name: String,