diff --git a/backend/mpc-system/docker-compose.yml b/backend/mpc-system/docker-compose.yml
index 8be175d4..3862c571 100644
--- a/backend/mpc-system/docker-compose.yml
+++ b/backend/mpc-system/docker-compose.yml
@@ -91,7 +91,8 @@ services:
       dockerfile: services/message-router/Dockerfile
     container_name: mpc-message-router
     ports:
-      - "8082:8080"  # WebSocket for external connections
+      - "50051:50051"  # gRPC for party connections
+      - "8082:8080"    # HTTP for health checks
     environment:
       TZ: Asia/Shanghai
       MPC_SERVER_GRPC_PORT: 50051