diff --git a/appengine/websockets/package.json b/appengine/websockets/package.json
index e1831711d0..375dcf09f6 100644
--- a/appengine/websockets/package.json
+++ b/appengine/websockets/package.json
@@ -18,7 +18,7 @@
   },
   "dependencies": {
     "express": "4.15.4",
-    "pug": "2.0.3",
+    "pug": "3.0.1",
     "socket.io": "2.2.0"
   },
   "devDependencies": {