diff --git a/playground-client/package.json b/playground-client/package.json
index c667c89..dc067d9 100644
--- a/playground-client/package.json
+++ b/playground-client/package.json
@@ -25,6 +25,7 @@
     "luxon": "^1.25.0",
     "mkdirp": "^0.5.5",
     "multilang-extract-comments": "^0.3.3",
+    "lines-and-columns": "^2.0.2",
     "socket.io": "^3.0.3",
     "socket.io-client": "^3.0.3",
     "socketio-auth": "^0.1.1",