diff --git a/config.json b/config.json
index d9eb7a1..199b111 100644
--- a/config.json
+++ b/config.json
@@ -8,7 +8,7 @@
     "timeout": 120,
     "udp_timeout": 60,
     "method": "aes-256-cfb",
-    "protocol": "auth_sha1_v4",
+    "protocol": "auth_aes128_md5",
     "protocol_param": "",
     "obfs": "tls1.2_ticket_auth_compatible",
     "obfs_param": "",