diff --git a/package.json b/package.json
index 6625fa56..b6496092 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "prettier-check": "prettier --check .",
     "format": "prettier --write .",
     "test": "cd server && yarn test",
-    "heroku-postbuild": "cd client && yarn install && cd ../server && yarn install --production=false && cd .. && yarn dev"
+    "heroku-postbuild": "cd client && yarn install && yarn build && cd ../server && yarn install --production=false && yarn build"
   },
   "dependencies": {
     "@emotion/react": "^11.7.1",