diff --git a/build/build-bundle.js b/build/build-bundle.js
index f1f32a3de02b..ddcc2ce62464 100644
--- a/build/build-bundle.js
+++ b/build/build-bundle.js
@@ -12,11 +12,11 @@
 
 const fs = require('fs');
 const path = require('path');
+const mkdir = fs.promises.mkdir;
 
 const LighthouseRunner = require('../lighthouse-core/runner.js');
 const babel = require('babel-core');
 const browserify = require('browserify');
-const makeDir = require('make-dir');
 const pkg = require('../package.json');
 
 const VERSION = pkg.version;
@@ -66,7 +66,6 @@ async function browserifyFile(entryPath, distPath) {
     .ignore('intl')
     .ignore('intl-pluralrules')
     .ignore('raven')
-    .ignore('mkdirp')
     .ignore('rimraf')
     .ignore('pako/lib/zlib/inflate.js');
 
@@ -104,7 +103,7 @@ async function browserifyFile(entryPath, distPath) {
   const bundleStream = bundle.bundle();
 
   // Make sure path exists.
-  await makeDir(path.dirname(distPath));
+  await mkdir(path.dirname(distPath), {recursive: true});
   return new Promise((resolve, reject) => {
     const writeStream = fs.createWriteStream(distPath);
     writeStream.on('finish', resolve);
diff --git a/build/build-extension.js b/build/build-extension.js
index 9c1085fc9542..e5580ec88445 100644
--- a/build/build-extension.js
+++ b/build/build-extension.js
@@ -6,10 +6,10 @@
 'use strict';
 
 const fs = require('fs');
+const mkdir = fs.promises.mkdir;
 
 const archiver = require('archiver');
 const cpy = require('cpy');
-const makeDir = require('make-dir');
 const bundleBuilder = require('./build-bundle.js');
 
 const sourceName = 'extension-entry.js';
@@ -38,7 +38,7 @@ async function copyPopup() {
   popupSrc = popupSrc.replace(/__COMMITHASH__/g, bundleBuilder.COMMIT_HASH);
 
   const popupDir = `${distDir}/scripts`;
-  await makeDir(popupDir);
+  await mkdir(popupDir, {recursive: true});
   fs.writeFileSync(`${popupDir}/popup.js`, popupSrc);
 }
 
@@ -65,7 +65,7 @@ async function copyAssets() {
  */
 async function packageExtension() {
   const packagePath = `${distDir}/../extension-package`;
-  await makeDir(packagePath);
+  await mkdir(packagePath, {recursive: true});
 
   return new Promise((resolve, reject) => {
     const archive = archiver('zip', {
diff --git a/build/build-lightrider-bundles.js b/build/build-lightrider-bundles.js
index 0fa8c562a313..047ed3d4d0b1 100644
--- a/build/build-lightrider-bundles.js
+++ b/build/build-lightrider-bundles.js
@@ -8,7 +8,6 @@
 const browserify = require('browserify');
 const fs = require('fs');
 const path = require('path');
-const makeDir = require('make-dir');
 const bundleBuilder = require('./build-bundle.js');
 const {minifyFileTransform} = require('./build-utils.js');
 
@@ -21,7 +20,7 @@ const generatorFilename = `./lighthouse-core/report/report-generator.js`;
 const entrySourceName = 'lightrider-entry.js';
 const entryDistName = 'lighthouse-lr-bundle.js';
 
-makeDir.sync(path.dirname(distDir));
+fs.mkdirSync(path.dirname(distDir), {recursive: true});
 
 /**
  * Browserify and minify entry point.
diff --git a/build/build-viewer.js b/build/build-viewer.js
index c3db40f4ba81..6a9359b62831 100644
--- a/build/build-viewer.js
+++ b/build/build-viewer.js
@@ -10,13 +10,13 @@ const path = require('path');
 const {promisify} = require('util');
 const readFileAsync = promisify(fs.readFile);
 const writeFileAsync = promisify(fs.writeFile);
+const mkdir = fs.promises.mkdir;
 
 const browserify = require('browserify');
 const cpy = require('cpy');
 const ghPages = require('gh-pages');
 const glob = promisify(require('glob'));
 const lighthousePackage = require('../package.json');
-const makeDir = require('make-dir');
 const rimraf = require('rimraf');
 const terser = require('terser');
 const {minifyFileTransform} = require('./build-utils.js');
@@ -59,7 +59,7 @@ async function loadFiles(pattern) {
  */
 async function safeWriteFileAsync(filePath, data) {
   const fileDir = path.dirname(filePath);
-  await makeDir(fileDir);
+  await mkdir(fileDir, {recursive: true});
   return writeFileAsync(filePath, data);
 }
 
diff --git a/build/tests/bundled-lighthouse-cli.js b/build/tests/bundled-lighthouse-cli.js
index 2b4958e33cc6..b3d8e73b1fb8 100644
--- a/build/tests/bundled-lighthouse-cli.js
+++ b/build/tests/bundled-lighthouse-cli.js
@@ -23,7 +23,6 @@
 
 const fs = require('fs');
 const path = require('path');
-const mkdirp = require('mkdirp');
 const rimraf = require('rimraf');
 const ChromeProtocol = require('../../lighthouse-core/gather/connections/cri.js');
 
@@ -51,16 +50,13 @@ const lighthouse = (function getLighthouseCoreBundled() {
     // TODO: use `globalThis` when we drop Node 10.
     .replace('new ChromeProtocol', 'new global.ChromeProtocol')
     // Needed for asset-saver.js.
-    .replace(/mkdirp\./g, 'global.mkdirp.')
     .replace(/rimraf\./g, 'global.rimraf.')
-    .replace(/fs\.(writeFileSync|createWriteStream)/g, 'global.$&');
+    .replace(/fs\.(writeFileSync|createWriteStream|mkdirSync)/g, 'global.$&');
 
   /* eslint-disable no-undef */
   // @ts-ignore
   global.ChromeProtocol = ChromeProtocol;
   // @ts-ignore
-  global.mkdirp = mkdirp;
-  // @ts-ignore
   global.rimraf = rimraf;
   // @ts-ignore
   global.fs = fs;
diff --git a/lighthouse-cli/test/smokehouse/smokehouse.js b/lighthouse-cli/test/smokehouse/smokehouse.js
index dd21f44acd49..f4db12d490b3 100755
--- a/lighthouse-cli/test/smokehouse/smokehouse.js
+++ b/lighthouse-cli/test/smokehouse/smokehouse.js
@@ -9,7 +9,6 @@
 /* eslint-disable no-console */
 
 const fs = require('fs');
-const mkdirp = require('mkdirp');
 const spawnSync = require('child_process').spawnSync;
 const yargs = require('yargs');
 const log = require('lighthouse-logger');
@@ -127,7 +126,7 @@ if (!smokeTest) {
 
 const lhRootDir = `${__dirname}/../../..`;
 const tmpDir = `${lhRootDir}/.tmp`;
-mkdirp.sync(tmpDir);
+fs.mkdirSync(tmpDir, {recursive: true});
 const configPath = `${tmpDir}/smoke-config-${smokeTest.id}.json`;
 fs.writeFileSync(configPath, JSON.stringify(smokeTest.config));
 
diff --git a/lighthouse-core/lib/asset-saver.js b/lighthouse-core/lib/asset-saver.js
index 677e6115623a..027268b14a44 100644
--- a/lighthouse-core/lib/asset-saver.js
+++ b/lighthouse-core/lib/asset-saver.js
@@ -13,7 +13,6 @@ const Simulator = require('./dependency-graph/simulator/simulator.js');
 const lanternTraceSaver = require('./lantern-trace-saver.js');
 const Metrics = require('./traces/pwmetrics-events.js');
 const rimraf = require('rimraf');
-const mkdirp = require('mkdirp');
 const NetworkAnalysisComputed = require('../computed/network-analysis.js');
 const LoadSimulatorComputed = require('../computed/load-simulator.js');
 const LHError = require('../lib/lh-error.js');
@@ -100,7 +99,7 @@ function stringifyReplacer(key, value) {
 async function saveArtifacts(artifacts, basePath) {
   const status = {msg: 'Saving artifacts', id: 'lh:assetSaver:saveArtifacts'};
   log.time(status);
-  mkdirp.sync(basePath);
+  fs.mkdirSync(basePath, {recursive: true});
   rimraf.sync(`${basePath}/*${traceSuffix}`);
   rimraf.sync(`${basePath}/${artifactsFilename}`);
 
diff --git a/lighthouse-core/scripts/build-report-for-autodeployment.js b/lighthouse-core/scripts/build-report-for-autodeployment.js
index ea1260a86e3c..19d65330e136 100644
--- a/lighthouse-core/scripts/build-report-for-autodeployment.js
+++ b/lighthouse-core/scripts/build-report-for-autodeployment.js
@@ -10,7 +10,6 @@
 /* eslint-disable no-console */
 const fs = require('fs');
 const path = require('path');
-const mkdirp = require('mkdirp').sync;
 const rimraf = require('rimraf').sync;
 const swapLocale = require('../lib/i18n/swap-locale.js');
 
@@ -45,7 +44,7 @@ const DIST = path.join(__dirname, `../../dist/now`);
         html = html.replace(`"lh-root lh-vars"`, `"lh-root lh-vars lh-devtools"`);
       }
       const filepath = `${DIST}/${variant}${filename}/index.html`;
-      mkdirp(path.dirname(filepath));
+      fs.mkdirSync(path.dirname(filepath), {recursive: true});
       fs.writeFileSync(filepath, html, {encoding: 'utf-8'});
       console.log('✅', filepath, 'written.');
     }
@@ -96,7 +95,7 @@ async function generateErrorLHR() {
 
   // Save artifacts to disk then run `lighthouse -G` with them.
   const TMP = `${DIST}/.tmp/`;
-  mkdirp(TMP);
+  fs.mkdirSync(TMP, {recursive: true});
   fs.writeFileSync(`${TMP}/artifacts.json`, JSON.stringify(artifacts), 'utf-8');
   const errorRunnerResult = await lighthouse(artifacts.URL.requestedUrl, {auditMode: TMP});
 
diff --git a/package.json b/package.json
index d4a800cf3db8..35a07748f6ae 100644
--- a/package.json
+++ b/package.json
@@ -85,8 +85,6 @@
     "@types/jpeg-js": "^0.3.0",
     "@types/lodash.isequal": "^4.5.2",
     "@types/lodash.set": "^4.3.6",
-    "@types/make-dir": "^1.0.3",
-    "@types/mkdirp": "^0.5.2",
     "@types/node": "*",
     "@types/raven": "^2.5.1",
     "@types/resize-observer-browser": "^0.1.1",
@@ -121,7 +119,6 @@
     "isomorphic-fetch": "^2.2.1",
     "jest": "^24.3.0",
     "jsdom": "^12.2.0",
-    "make-dir": "^1.3.0",
     "npm-run-posix-or-windows": "^2.0.2",
     "nyc": "^13.3.0",
     "package-json-versionify": "^1.0.4",
@@ -151,7 +148,6 @@
     "lodash.set": "^4.3.2",
     "lookup-closest-locale": "6.0.4",
     "metaviewport-parser": "0.2.0",
-    "mkdirp": "0.5.1",
     "open": "^6.4.0",
     "parse-cache-control": "1.0.1",
     "raven": "^2.2.1",
diff --git a/yarn.lock b/yarn.lock
index b88ec638f459..1e20d91d6cb8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -541,25 +541,11 @@
   resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.106.tgz#6093e9a02aa567ddecfe9afadca89e53e5dce4dd"
   integrity sha512-tOSvCVrvSqFZ4A/qrqqm6p37GZoawsZtoR0SJhlF7EonNZUgrn8FfT+RNQ11h+NUpMt6QVe36033f3qEKBwfWA==
 
-"@types/make-dir@^1.0.3":
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/@types/make-dir/-/make-dir-1.0.3.tgz#91fb52cefd07b0755d2373bcd46229765197ca3e"
-  integrity sha512-bFRvlvUdPwxj47K2yVh7OBL8Mu8h//5k/hQJkz0iAZAlxhnIDydFezGA96zehtnRfrZDuIyPd+RC2kmBGtcs0w==
-  dependencies:
-    "@types/node" "*"
-
 "@types/minimatch@*":
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
   integrity sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==
 
-"@types/mkdirp@^0.5.2":
-  version "0.5.2"
-  resolved "https://registry.yarnpkg.com/@types/mkdirp/-/mkdirp-0.5.2.tgz#503aacfe5cc2703d5484326b1b27efa67a339c1f"
-  integrity sha512-U5icWpv7YnZYGsN4/cmh3WD2onMY0aJIiTE6+51TwJCttdHvtCYmkBNOobHlXwrJRL0nkH9jH4kD+1FAdMN4Tg==
-  dependencies:
-    "@types/node" "*"
-
 "@types/node@*":
   version "10.14.0"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-10.14.0.tgz#1c297530428c6f4e0a0a3222f5b44745669aa9f7"