diff --git a/packages/playground/package.json b/packages/playground/package.json
index 631b2d7..d1c55b3 100644
--- a/packages/playground/package.json
+++ b/packages/playground/package.json
@@ -16,6 +16,7 @@
   },
   "dependencies": {
     "@mailik/sdk": "^0.0.1",
+    "assert": "^2.0.0",
     "browserify-zlib": "^0.2.0",
     "buffer": "^6.0.3",
     "events": "^3.3.0",