diff --git a/package.json b/package.json
index bb8ac92..865c2a2 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,6 @@
     "ramda": "^0.23.0",
     "tcomb": "^3.2.6",
     "ws": "^1.1.1",
-    "zen-observable": "^0.4.0"
+    "zen-observable": "^0.5.0"
   }
 }