diff --git a/client.js b/client.js
index 671f134..7df73f0 100644
--- a/client.js
+++ b/client.js
@@ -5,7 +5,6 @@ const once = require('once')
 const parallel = require('run-parallel')
 const Peer = require('simple-peer')
 const uniq = require('uniq')
-const URL = require('url').URL
 
 const common = require('./lib/common')
 const HTTPTracker = require('./lib/client/http-tracker') // empty object in browser
diff --git a/lib/client/udp-tracker.js b/lib/client/udp-tracker.js
index 4923ce1..4568eef 100644
--- a/lib/client/udp-tracker.js
+++ b/lib/client/udp-tracker.js
@@ -5,7 +5,6 @@ const compact2string = require('compact2string')
 const debug = require('debug')('bittorrent-tracker:udp-tracker')
 const dgram = require('dgram')
 const randombytes = require('randombytes')
-const URL = require('url').URL
 
 const common = require('../common')
 const Tracker = require('./tracker')
diff --git a/package.json b/package.json
index 89e7e5e..95243a1 100644
--- a/package.json
+++ b/package.json
@@ -49,9 +49,8 @@
     "tape": "^4.0.0",
     "webtorrent-fixtures": "^1.3.0"
   },
-  "optionalDependencies": {
-    "bufferutil": "^4.0.0",
-    "utf-8-validate": "^5.0.1"
+  "engines": {
+    "node": ">=10"
   },
   "keywords": [
     "bittorrent",
@@ -65,12 +64,16 @@
   ],
   "license": "MIT",
   "main": "index.js",
+  "optionalDependencies": {
+    "bufferutil": "^4.0.0",
+    "utf-8-validate": "^5.0.1"
+  },
   "repository": {
     "type": "git",
     "url": "git://github.com/webtorrent/bittorrent-tracker.git"
   },
   "scripts": {
-    "update-authors": "./tools/update-authors.sh",
-    "test": "standard && tape test/*.js"
+    "test": "standard && tape test/*.js",
+    "update-authors": "./tools/update-authors.sh"
   }
 }