diff --git a/package.json b/package.json
index e39b0b4..4d38e49 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,8 @@
     "json5": "^2.2.1",
     "lit": "^2.2.5",
     "path": "^0.12.7",
+    "source-map-loader": "^3.0.1",
+    "ts-loader": "^9.3.0",
     "webpack": "^5.72.1",
     "webpack-cli": "^4.9.2",
     "webpack-preprocessor-loader": "^1.2.0",