diff --git a/lib/request.js b/lib/request.js
index 224cedb..0da5468 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -304,10 +304,11 @@ function serverAddress (app, path) {
  * @api private
  */
 
-function TestAgent(app) {
+function TestAgent(app, options={}) {
   if (!(this instanceof TestAgent)) return new TestAgent(app);
   if (typeof app === 'function') app = http.createServer(app);
-  (Agent || Request).call(this);
+  const agent = new Agent(options);
+  Object.assign(this, agent);
   this.app = app;
   if (typeof app !== 'string' && app && app.listen && app.address && !app.address()) {
     this.app = app.listen(0)
diff --git a/package-lock.json b/package-lock.json
index 013f1b7..29fdb8c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "is-ip": "^3.1.0",
         "methods": "^1.1.2",
         "qs": "^6.11.2",
-        "superagent": "^8.0.9"
+        "superagent": "^9"
       },
       "devDependencies": {
         "@jsdevtools/simplifyify": "^8.0.4",
@@ -4284,14 +4284,13 @@
       }
     },
     "node_modules/formidable": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/formidable/-/formidable-2.1.2.tgz",
-      "integrity": "sha512-CM3GuJ57US06mlpQ47YcunuUZ9jpm8Vx+P2CGt2j7HpgkKZO/DJYQ0Bobim8G6PFQmK5lOqOOdUXboU+h73A4g==",
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.5.1.tgz",
+      "integrity": "sha512-WJWKelbRHN41m5dumb0/k8TeAx7Id/y3a+Z7QfhxP/htI9Js5zYaEDtG8uMgG0vM0lOlqnmjE99/kfpOYi/0Og==",
       "dependencies": {
         "dezalgo": "^1.0.4",
         "hexoid": "^1.0.0",
-        "once": "^1.4.0",
-        "qs": "^6.11.0"
+        "once": "^1.4.0"
       },
       "funding": {
         "url": "https://ko-fi.com/tunnckoCore/commissions"
@@ -13746,23 +13745,23 @@
       }
     },
     "node_modules/superagent": {
-      "version": "8.0.9",
-      "resolved": "https://registry.npmjs.org/superagent/-/superagent-8.0.9.tgz",
-      "integrity": "sha512-4C7Bh5pyHTvU33KpZgwrNKh/VQnvgtCSqPRfJAUdmrtSYePVzVg4E4OzsrbkhJj9O7SO6Bnv75K/F8XVZT8YHA==",
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-9.0.1.tgz",
+      "integrity": "sha512-CcRSdb/P2oUVaEpQ87w9Obsl+E9FruRd6b2b7LdiBtJoyMr2DQt7a89anAfiX/EL59j9b2CbRFvf2S91DhuCww==",
       "dependencies": {
         "component-emitter": "^1.3.0",
         "cookiejar": "^2.1.4",
         "debug": "^4.3.4",
         "fast-safe-stringify": "^2.1.1",
         "form-data": "^4.0.0",
-        "formidable": "^2.1.2",
+        "formidable": "^3.5.1",
         "methods": "^1.1.2",
         "mime": "2.6.0",
         "qs": "^6.11.0",
         "semver": "^7.3.8"
       },
       "engines": {
-        "node": ">=6.4.0 <13 || >=14"
+        "node": ">=14.18.0"
       }
     },
     "node_modules/superagent/node_modules/form-data": {
diff --git a/package.json b/package.json
index 52a9aa0..6415cac 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "is-ip": "^3.1.0",
     "methods": "^1.1.2",
     "qs": "^6.11.2",
-    "superagent": "^8.0.9"
+    "superagent": "^9"
   },
   "devDependencies": {
     "@jsdevtools/simplifyify": "^8.0.4",