diff --git a/index.js b/index.js
index 0dbe740..fac31f1 100644
--- a/index.js
+++ b/index.js
@@ -12,7 +12,6 @@
  * @private
  */
 
-const flatten = require('array-flatten').flatten
 const isPromise = require('is-promise')
 const Layer = require('./lib/layer')
 const methods = require('methods')
@@ -27,6 +26,7 @@ const setPrototypeOf = require('setprototypeof')
  */
 
 const slice = Array.prototype.slice
+const flatten = Array.prototype.flat
 
 /**
  * Expose `Router`.
@@ -374,7 +374,7 @@ Router.prototype.use = function use (handler) {
     }
   }
 
-  const callbacks = flatten(slice.call(arguments, offset))
+  const callbacks = flatten.call(slice.call(arguments, offset), Infinity)
 
   if (callbacks.length === 0) {
     throw new TypeError('argument handler is required')
diff --git a/package.json b/package.json
index c118ec6..153e133 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,6 @@
   "license": "MIT",
   "repository": "pillarjs/router",
   "dependencies": {
-    "array-flatten": "3.0.0",
     "is-promise": "4.0.0",
     "methods": "~1.1.2",
     "parseurl": "~1.3.3",