diff --git a/content/static/tutorial/util/reveal/package.json b/content/static/tutorial/util/reveal/package.json
index c2e6d3d..694a345 100644
--- a/content/static/tutorial/util/reveal/package.json
+++ b/content/static/tutorial/util/reveal/package.json
@@ -22,7 +22,7 @@
   },
   "dependencies": {
     "underscore": "~1.3.3",
-    "express": "~2.5.9",
+    "express": "~4.17.1",
     "mustache": "~0.4.0",
     "socket.io": "~0.9.13"
   },