diff --git a/package.json b/package.json
index 17dc6ca..9d4eef3 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
   "dependencies": {
     "body-parser": "^1.15.2",
     "dotenv": "^2.0.0",
-    "express": "^4.14.0",
+    "express": "^4.21.1",
     "nexmo": "^1.0.0-beta-7"
   },
   "devDependencies": {