diff --git a/package.json b/package.json
index 34d288637a..055df91302 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,6 @@
     "@types/chai": "^4.3.4",
     "@types/chai-as-promised": "^7.1.5",
     "@types/mocha": "^10.0.1",
-    "@types/qs": "^6.9.7",
     "@typescript-eslint/eslint-plugin": "^4.33.0",
     "@typescript-eslint/parser": "^4.33.0",
     "chai": "^4.3.6",
@@ -55,8 +54,7 @@
     "nanoid": "^3.2.0"
   },
   "dependencies": {
-    "@types/node": ">=8.1.0",
-    "qs": "^6.11.0"
+    "@types/node": ">=8.1.0"
   },
   "license": "MIT",
   "scripts": {
@@ -97,4 +95,4 @@
       "require": "./cjs/stripe.cjs.node.js"
     }
   }
-}
+}
\ No newline at end of file
diff --git a/src/utils.ts b/src/utils.ts
index 32585e46a2..eb7185b12f 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,11 +1,10 @@
-import * as qs from 'qs';
 import {
-  RequestData,
-  UrlInterpolator,
+  MultipartRequestData,
   RequestArgs,
-  StripeResourceObject,
+  RequestData,
   RequestHeaders,
-  MultipartRequestData,
+  StripeResourceObject,
+  UrlInterpolator,
 } from './Types.js';
 
 const OPTIONS_KEYS = [
@@ -39,16 +38,91 @@ export function isOptionsHash(o: unknown): boolean | unknown {
   );
 }
 
+const has = Function.call.bind(Object.prototype.hasOwnProperty);
+
+// https://github.com/sindresorhus/query-string/blob/main/base.js
+const strictUriEncode = (str: string): string =>
+  encodeURIComponent(str).replace(
+    /[!'()*]/g,
+    (x) =>
+      `%${x
+        .charCodeAt(0)
+        .toString(16)
+        .toUpperCase()}`
+  );
+
+/**
+ * Stringifies an Object into a query string
+ * @param obj - The object to stringify
+ * @param prefix - The parent key when nesting
+ * @param visited - Previously visited objects
+ * @returns The query string
+ */
+export function stringify (
+  obj: Record<string, unknown>,
+  config = {
+    serializeDate: (d: Date): string | number => d.toISOString(),
+  },
+  prefix?: string,
+  visited = new Set()
+): string {
+  const str = [];
+  if (visited.has(obj)) {
+    visited.clear();
+    throw new RangeError('Cyclic object value');
+  }
+  visited.add(obj);
+  for (const p in obj) {
+    if (has(obj, p)) {
+      const k = prefix ? prefix + '[' + p + ']' : p;
+      const v = obj[p];
+      if (v === undefined) {
+        continue;
+      } else if (v instanceof Date) {
+        str.push(encodeURIComponent(k) + '=' + config.serializeDate(v));
+      } else if (Array.isArray(v)) {
+        for (let i = 0; i < v.length; i++) {
+          // eslint-disable-next-line max-depth
+          if (typeof v[i] === 'object' && v[i] !== null) {
+            str.push(
+              stringify(
+                v[i] as Record<string, unknown>,
+                config,
+                k + '[' + i + ']',
+                visited
+              )
+            );
+          } else {
+            str.push(
+              encodeURIComponent(k + '[' + i + ']') +
+                '=' +
+                strictUriEncode(v[i])
+            );
+          }
+        }
+      } else if (typeof v === 'object' && v !== null) {
+        str.push(stringify(v as Record<string, unknown>, config, k, visited));
+      } else {
+        str.push(
+          encodeURIComponent(k) + '=' + strictUriEncode((v as string) ?? '')
+        );
+      }
+    }
+  }
+  visited.delete(obj);
+  return str.join('&');
+};
+
 /**
  * Stringifies an Object, accommodating nested objects
  * (forming the conventional key 'parent[child]=value')
  */
 export function stringifyRequestData(data: RequestData | string): string {
+  if (typeof data === 'string') return '';
   return (
-    qs
-      .stringify(data, {
-        serializeDate: (d: Date) => Math.floor(d.getTime() / 1000).toString(),
-      })
+    stringify(data, {
+      serializeDate: (d: Date) => Math.floor(d.getTime() / 1000).toString(),
+    })
       // Don't use strict form encoding by changing the square bracket control
       // characters back to their literals. This is fine by the server, and
       // makes these parameter strings easier to read.
diff --git a/test/resources/OAuth.spec.js b/test/resources/OAuth.spec.js
index fba0499f97..fd652a1bd4 100644
--- a/test/resources/OAuth.spec.js
+++ b/test/resources/OAuth.spec.js
@@ -4,7 +4,7 @@ const stripe = require('../testUtils.js').getSpyableStripe();
 
 const expect = require('chai').expect;
 const URL = require('url');
-const qs = require('qs');
+const qs = require('node:querystring');
 
 describe('OAuth', () => {
   describe('authorize', () => {
diff --git a/test/utils.spec.ts b/test/utils.spec.ts
index 248d8ee92b..a40418cb60 100644
--- a/test/utils.spec.ts
+++ b/test/utils.spec.ts
@@ -1,6 +1,6 @@
 // @ts-nocheck
+import { expect } from 'chai';
 import * as utils from '../src/utils.js';
-import {expect} from 'chai';
 
 describe('utils', () => {
   describe('makeURLInterpolator', () => {
@@ -472,6 +472,164 @@ describe('utils', () => {
       expect(mergedBufToString).to.equal('foobar');
     });
   });
+
+  describe('stringify', function() {
+    it('stringifies a querystring object', function() {
+      expect(utils.stringify({a: 'b'})).to.equal('a=b');
+      expect(utils.stringify({a: 1})).to.equal('a=1');
+      expect(utils.stringify({a: 1, b: 2})).to.equal('a=1&b=2');
+      expect(utils.stringify({a: 'A_Z'})).to.equal('a=A_Z');
+      expect(utils.stringify({a: '€'})).to.equal('a=%E2%82%AC');
+      expect(utils.stringify({a: ''})).to.equal('a=%EE%80%80');
+      expect(utils.stringify({a: 'א'})).to.equal('a=%D7%90');
+      expect(utils.stringify({a: '𐐷'})).to.equal('a=%F0%90%90%B7');
+    });
+
+    it('stringifies falsy values', function() {
+      expect(utils.stringify(undefined), '');
+      expect(utils.stringify(null), '');
+      expect(utils.stringify(false), '');
+      expect(utils.stringify(0), '');
+    });
+    it('encodes dot in key of object when encodeDotInKeys and allowDots is provided', function() {
+      expect(
+        utils.stringify({'name.obj': {first: 'John', last: 'Doe'}})
+      ).to.equal('name.obj%5Bfirst%5D=John&name.obj%5Blast%5D=Doe');
+
+      expect(
+        utils.stringify({
+          'name.obj.subobject': {'first.godly.name': 'John', last: 'Doe'},
+        })
+      ).to.equal(
+        'name.obj.subobject%5Bfirst.godly.name%5D=John&name.obj.subobject%5Blast%5D=Doe'
+      );
+    });
+
+    it('stringifies nested falsy values', function() {
+      expect(utils.stringify({a: {b: {c: null}}})).to.equal('a%5Bb%5D%5Bc%5D=');
+      expect(utils.stringify({a: {b: {c: false}}})).to.equal(
+        'a%5Bb%5D%5Bc%5D=false'
+      );
+    });
+
+    it('stringifies an array value', function() {
+      expect(utils.stringify({a: ['b', 'c', 'd']})).to.equal(
+        'a%5B0%5D=b&a%5B1%5D=c&a%5B2%5D=d'
+      );
+    });
+
+    it('should omit object key/value pair when value is empty array', function() {
+      expect(utils.stringify({a: [], b: 'zz'})).to.equal('b=zz');
+    });
+
+    it('stringify an array with multiple items with a comma inside', function() {
+      expect(utils.stringify({a: ['b,c', 'd']})).to.equal(
+        'a%5B0%5D=b%2Cc&a%5B1%5D=d'
+      );
+    });
+    it('stringifies nested array', function() {
+      expect(utils.stringify({a: {b: ['c', 'd']}})).to.equal(
+        'a%5Bb%5D%5B0%5D=c&a%5Bb%5D%5B1%5D=d'
+      );
+    });
+    it('stringifies comma and empty array values', function() {
+      expect(utils.stringify({a: [',', '', 'c,d%']})).to.equal(
+        'a%5B0%5D=%2C&a%5B1%5D=&a%5B2%5D=c%2Cd%25'
+      );
+    });
+
+    it('stringifies comma and empty non-array values', function() {
+      expect(utils.stringify({a: ',', b: '', c: 'c,d%'})).to.equal(
+        'a=%2C&b=&c=c%2Cd%25'
+      );
+    });
+
+    it('stringifies an object inside an array', function() {
+      expect(utils.stringify({a: [{b: 'c'}]})).to.equal('a%5B0%5D%5Bb%5D=c');
+      expect(utils.stringify({a: [{b: {c: [1]}}]})).to.equal(
+        'a%5B0%5D%5Bb%5D%5Bc%5D%5B0%5D=1'
+      );
+    });
+
+    it('stringifies an array with mixed objects and primitives', function() {
+      expect(utils.stringify({a: [{b: 1}, 2, 3]})).to.equal(
+        'a%5B0%5D%5Bb%5D=1&a%5B1%5D=2&a%5B2%5D=3'
+      );
+    });
+
+    it('stringifies an empty value', function() {
+      expect(utils.stringify({a: ''})).to.equal('a=');
+      expect(utils.stringify({a: null})).to.equal('a=');
+      expect(utils.stringify({a: '', b: ''})).to.equal('a=&b=');
+      expect(utils.stringify({a: null, b: ''})).to.equal('a=&b=');
+      expect(utils.stringify({a: {b: ''}})).to.equal('a%5Bb%5D=');
+      expect(utils.stringify({a: {b: null}})).to.equal('a%5Bb%5D=');
+    });
+
+    it('stringifies a null object', function() {
+      const obj = Object.create(null);
+      obj.a = 'b';
+      expect(utils.stringify(obj)).to.equal('a=b');
+    });
+
+    it('returns an empty string for invalid input', function() {
+      expect(utils.stringify(undefined)).to.equal('');
+      expect(utils.stringify(false)).to.equal('');
+      expect(utils.stringify(null)).to.equal('');
+      expect(utils.stringify('')).to.equal('');
+    });
+
+    it('stringifies an object with a null object as a child', function() {
+      const obj = {a: Object.create(null)};
+      obj.a.b = 'c';
+      expect(utils.stringify(obj)).to.equal('a%5Bb%5D=c');
+    });
+
+    it('drops keys with a value of undefined', function() {
+      expect(utils.stringify({a: undefined})).to.equal('');
+      expect(utils.stringify({a: 'b', c: undefined})).to.equal('a=b');
+      expect(utils.stringify({a: {b: undefined, c: null}})).to.equal(
+        'a%5Bc%5D='
+      );
+      expect(utils.stringify({a: {b: undefined, c: ''}})).to.equal('a%5Bc%5D=');
+    });
+
+    it('url encodes values', function() {
+      expect(utils.stringify({a: 'b c'})).to.equal('a=b%20c');
+      expect(utils.stringify({a: 'b+c'})).to.equal('a=b%2Bc');
+      expect(utils.stringify({a: 'b&c'})).to.equal('a=b%26c');
+      expect(utils.stringify({a: 'b=c'})).to.equal('a=b%3Dc');
+      expect(utils.stringify({a: 'b%c'})).to.equal('a=b%25c');
+    });
+
+    it('stringifies a date', function() {
+      const now = new Date();
+      expect(utils.stringify({a: now})).to.equal(`a=${now.toISOString()}`);
+    });
+
+    it('stringifies the weird object from qs', function() {
+      expect(
+        utils.stringify({'my weird field': '~q1!2"\'w$5&7/z8)?'})
+      ).to.equal('my%20weird%20field=~q1%212%22%27w%245%267%2Fz8%29%3F');
+    });
+
+    it('skips properties that are part of the object prototype', function() {
+      // eslint-disable-next-line no-extend-native
+      Object.prototype.crash = 'test';
+
+      expect(utils.stringify({a: 'b'})).to.equal('a=b');
+      expect(utils.stringify({a: {b: 'c'}})).to.equal('a%5Bb%5D=c');
+
+      delete Object.prototype.crash; // Clean up
+    });
+
+    it('stringifies boolean values', function() {
+      expect(utils.stringify({a: true})).to.equal('a=true');
+      expect(utils.stringify({a: {b: true}})).to.equal('a%5Bb%5D=true');
+      expect(utils.stringify({b: false})).to.equal('b=false');
+      expect(utils.stringify({b: {c: false}})).to.equal('b%5Bc%5D=false');
+    });
+  });
 });
 
 function handleWarnings(doWithShimmedConsoleWarn, onWarn): void {