diff --git a/websrc/package.json b/websrc/package.json
index ee7d31e..4642e1e 100644
--- a/websrc/package.json
+++ b/websrc/package.json
@@ -4,6 +4,7 @@
   "main": "index.tsx",
   "license": "MIT",
   "devDependencies": {
+    "@types/luxon": "^1.25.0",
     "@types/react": "^17.0.0",
     "@types/react-dom": "^17.0.0",
     "@types/react-helmet": "^6.1.0",
@@ -18,6 +19,7 @@
     "autoprefixer": "^10.1.0",
     "classnames": "^2.2.6",
     "css": "^3.0.0",
+    "luxon": "^1.25.0",
     "plotly.js": "^1.58.2",
     "postcss": "^8.2.1",
     "postcss-cli": "^8.3.1",