diff --git a/Dockerfile b/Dockerfile
index 013e7632..dab7be50 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -28,6 +28,6 @@ WORKDIR /app
 
 # Copy only the built output - no source, no .env, no dev deps
 COPY --from=builder /app/build ./build
-COPY --from=builder /app/server.mjs ./server.mjs
+COPY --from=builder /app/server.js ./server.js
 
-CMD ["node", "server.mjs"]
+CMD ["node", "server.js"]