diff --git a/package.json b/package.json
index b99c055..77b1801 100644
--- a/package.json
+++ b/package.json
@@ -2,8 +2,9 @@
   "name": "frontend",
   "version": "0.0.0",
   "scripts": {
+    "heroku-postbuild": "ng build --prod",
     "ng": "ng",
-    "start": "ng serve",
+    "start": "node server.js",
     "build": "ng build",
     "test": "ng test",
     "lint": "ng lint",
@@ -34,6 +35,9 @@
     "typescript": "~4.3.5"
   },
   "devDependencies": {
+    "@angular/cli": "~12.2.11",
+    "@angular/compiler-cli": "~12.2.11",
+    "typescript": "~4.3.5",
     "@angular-devkit/build-angular": "~12.2.11",
     "@angular/localize": "^12.2.11",
     "@types/jasmine": "~3.6.0",
@@ -50,4 +54,8 @@
     "ts-node": "~8.3.0",
     "tslint": "~6.1.0"
   }
+  "engines": {
+    "node": "12.18.2",
+    "npm": "6.14.5"
+  }
 }