diff --git a/package.json b/package.json
index 5987cab..c453b87 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
   "license": "MIT OR Apache-2.0",
   "dependencies": {
     "dig.js": "git+https://git.coolaj86.com/coolaj86/dig.js#v1.3",
+    "express": "^4.16.2",
     "hexdump.js": "git+https://git.coolaj86.com/coolaj86/hexdump.js#v1.0.4"
   }
 }