diff --git a/package.json b/package.json
index 60053dd..2adf83c 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "jsonify": "^0.0.0"
   },
   "optionalDependencies": {
+    "weak": "^1.0.0"
     "weak-napi": "^2.0.2"
   },
   "devDependencies": {