diff --git a/lib/aliyun/services/cdn.rb b/lib/aliyun/services/cdn.rb
index 79cb9a8..e1b1912 100644
--- a/lib/aliyun/services/cdn.rb
+++ b/lib/aliyun/services/cdn.rb
@@ -9,7 +9,7 @@ def self.endpoint
     def self.default_parameters
       {
         :Format=>"JSON",
-        :Version=>"2014-11-11",
+        :Version=>"2018-05-10",
         :SignatureMethod=>"HMAC-SHA1",
         :SignatureVersion=>"1.0"
       }