diff --git a/package.json b/package.json
index bca3a719..b2a86249 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "chai": "^3.5.0",
     "mocha": "^3.2.0",
     "rimraf": "^2.6.1",
+    "rxjs": "^5.3.0",
     "tslint": "^5.1.0",
     "typescript": "^2.3.2"
   },