diff --git a/apps/bookstore/app/package.json b/apps/bookstore/app/package.json
index a4a6207487..ab6fd0fea1 100644
--- a/apps/bookstore/app/package.json
+++ b/apps/bookstore/app/package.json
@@ -29,7 +29,7 @@
     "@angular/platform-browser": "4.0.3",
     "@angular/platform-browser-dynamic": "4.0.3",
     "@angular/router": "4.0.3",
-    "@google-cloud/pubsub": "^0.19.0",
+    "@google-cloud/pubsub": "^0.21.0",
     "atob": "^2.0.3",
     "body-parser": "^1.15.2",
     "core-js": "^2.4.1",