diff --git a/package.json b/package.json
index 0e096eb..06cca4f 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "server": "docker-compose up --build",
     "sign": "npx --yes @grafana/sign-plugin@latest",
     "pretty": "prettier --single-quote  --write \"{src,__{tests,demo,dist}__}/**/*.ts*\"",
-    "prepare": "cd 3rdparty/cubism-es; npm install; npm run build"
+    "prepare": "git submodule --update --init; cd 3rdparty/cubism-es; npm install; npm run build"
   },
   "nyc": {
     "report-dir": "coverage/cypress"