diff --git a/server.js b/server.js
index 0518145..c9ddd8b 100644
--- a/server.js
+++ b/server.js
@@ -4,7 +4,7 @@ const next = require("next");
 
 const dev = process.env.NODE_ENV !== "production";
 const hostname = "localhost";
-const port = 3000;
+const port = process.env.PORT ?? 3000;
 // when using middleware `hostname` and `port` must be provided below
 const app = next({ dev, hostname, port });
 const handle = app.getRequestHandler();