diff --git a/frontend/railway.toml b/frontend/railway.toml
new file mode 100644
index 0000000..ed6afc0
--- /dev/null
+++ b/frontend/railway.toml
@@ -0,0 +1,6 @@
+[build]
+# Explicitly use the Dockerfile in this directory (Node.js 22).
+# Without this, Railway auto-detects and generates a Dockerfile using
+# Node.js 18, which is incompatible with the version of Vite used here
+# (rolldown-vite requires Node.js 20.19+ or 22.12+).
+dockerfilePath = "Dockerfile"