diff --git a/README.md b/README.md
index ad0eb5f..91cb1ea 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ python3 -m http.server 8000
 **Docker / OrbStack** (nginx, production-style headers)
 ```bash
 docker compose up -d --build
-# → http://localhost:8080
+# → http://localhost:8090
 docker compose down
 ```
 
diff --git a/docker-compose.yml b/docker-compose.yml
index b571dde..65a23c0 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,12 +1,13 @@
 # Run the game locally with OrbStack's Docker engine:
 #   docker compose up -d --build
-#   open http://localhost:8080
+#   open http://localhost:8090
 #   docker compose down
+# (Host port 8090 chosen to avoid colliding with other local containers.)
 services:
   tictactoe:
     build: .
     image: tictactoe:latest
     container_name: tictactoe
     ports:
-      - "8080:80"
+      - "8090:80"
     restart: unless-stopped