diff --git a/lib/client.js b/lib/client.js
index 972ed54..a560499 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -30,6 +30,9 @@ class Client {
     const {domain, endpoint} = getEndpoint(accountid, opts);
     this.endpointDomain = domain;
     this.endpoint = endpoint;
+
+    // security token
+    this.securityToken = opts.securityToken;
   }
 
   async request(method, resource, type, requestBody, attentions = [], opts = {}) {
@@ -138,6 +141,10 @@ class Client {
 
     headers['authorization'] = `MNS ${this.accessKeyID}:${signature}`;
 
+    if (this.securityToken) {
+      headers['security-token'] = this.securityToken;
+    }
+
     return headers;
   }