diff --git a/example/echo/.rr.yaml b/example/echo/.rr.yaml
index 3069f44..b2dd227 100644
--- a/example/echo/.rr.yaml
+++ b/example/echo/.rr.yaml
@@ -1,4 +1,4 @@
-version: "2.7"
+version: "3"
 rpc:
   listen: "tcp://127.0.0.1:6001"
 
@@ -9,7 +9,7 @@ server:
 
 grpc:
   listen: "tcp://127.0.0.1:9001"
-  proto: "service.proto"
+  proto: ["service.proto"]
   max_send_msg_size: 50
   max_recv_msg_size: 50
   max_connection_idle: 0s
@@ -22,4 +22,4 @@ grpc:
     num_workers: 2
     max_jobs: 0
     allocate_timeout: 60s
-    destroy_timeout: 60
+    destroy_timeout: 60s