diff --git a/ch20/autocomplete/package.json b/ch20/autocomplete/package.json
index b6399e4..0da9aa7 100644
--- a/ch20/autocomplete/package.json
+++ b/ch20/autocomplete/package.json
@@ -29,7 +29,7 @@
     "express": "4.13.1",
     "express-handlebars": "2.0.1",
     "express-validator": "2.13.0",
-    "mongodb": "2.0.36",
+    "mongodb": "3.6.1",
     "morgan": "1.6.1"
   },
   "devDependencies": {