diff --git a/nginx/default.conf b/nginx/default.conf
index 2275de4..1e7a0b7 100644
--- a/nginx/default.conf
+++ b/nginx/default.conf
@@ -142,12 +142,15 @@ server {
 
   # profile API (Portfolio Service)
   location /api/profile/ {
+    resolver 127.0.0.11 valid=10s;
+    set $portfolio_backend portfolio:8000;
+
     proxy_http_version 1.1;
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
-    proxy_pass http://portfolio:8000/api/profile/;
+    proxy_pass http://$portfolio_backend$request_uri;
   }
 
   # agent-office API + WebSocket