diff --git a/reveal.js/package.json b/reveal.js/package.json
index e089a4a..4704dbc 100644
--- a/reveal.js/package.json
+++ b/reveal.js/package.json
@@ -22,7 +22,7 @@
     "node": "~v4.9.1"
   },
   "dependencies": {
-    "express": "~4.19.2",
+    "express": "~4.20.0",
     "grunt-cli": "~0.1.13",
     "mustache": "~2.3.2",
     "socket.io": "~1.7.4"
diff --git a/reveal.js/plugin/multiplex/package.json b/reveal.js/plugin/multiplex/package.json
index 06d4162..5fc47e8 100644
--- a/reveal.js/plugin/multiplex/package.json
+++ b/reveal.js/plugin/multiplex/package.json
@@ -10,7 +10,7 @@
     "node": "~v4.9.1"
   },
   "dependencies": {
-    "express": "~4.19.2",
+    "express": "~4.20.0",
     "grunt-cli": "~0.1.13",
     "mustache": "~2.3.2",
     "socket.io": "~1.3.7"