diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..f1b9252
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1719075281,
+        "narHash": "sha256-CyyxvOwFf12I91PBWz43iGT1kjsf5oi6ax7CrvaMyAo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a71e967ef3694799d0c418c98332f7ff4cc5f6af",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..0bf17dc
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,26 @@
+{
+  description = "little-hesinde project";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default =
+          with pkgs;
+          mkShell {
+            buildInputs = [
+              geckodriver
+              nodejs_22
+            ];
+          };
+      }
+    );
+}
diff --git a/nzz.js b/nzz.js
index 7707cf2..7aab650 100755
--- a/nzz.js
+++ b/nzz.js
@@ -1,38 +1,37 @@
 #!/usr/bin/env node
-/* Copyright (c) Sebastian Hugentobler <sebastian@vanwa.ch> 2020.
+/* Copyright (c) Sebastian Hugentobler <shu@vanwa.ch> 2024.
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-const tmp = require('tmp');
-var path = require('path');
-const fs = require('fs');
-const { Builder, By, Capabilities, Key, until } = require('selenium-webdriver');
-const fx = require('selenium-webdriver/firefox');
-const yargs = require('yargs/yargs')
-const { hideBin } = require('yargs/helpers');
+const tmp = require("tmp");
+const path = require("path");
+const fs = require("fs");
+const { Builder, By, Capabilities, Key, until } = require("selenium-webdriver");
+const fx = require("selenium-webdriver/firefox");
+const yargs = require("yargs/yargs");
+const { hideBin } = require("yargs/helpers");
 
-const URL = 'https://zeitungsarchiv.nzz.ch/';
-const RETRY_DELAY = 2000;
+const URL = "https://zeitungsarchiv.nzz.ch/";
 const WAIT_TIMEOUT = 2000;
 const TIMEOUT_MSG = `Timeout after ${WAIT_TIMEOUT / 1000} seconds.`;
 const SEARCH_WAIT_TIMEOUT = 5000;
 const SEARCH_TIMEOUT_MSG = `Timeout after ${SEARCH_WAIT_TIMEOUT / 1000} seconds.`;
 
 Date.prototype.isoDate = function () {
-  return `${this.getFullYear()}-${String(this.getMonth() + 1).padStart(2, '0')}-${String(this.getDate()).padStart(2, '0')}`;
-}
+  return `${this.getFullYear()}-${String(this.getMonth() + 1).padStart(2, "0")}-${String(this.getDate()).padStart(2, "0")}`;
+};
 
 Date.prototype.nzzDate = function () {
-  return `${String(this.getDate()).padStart(2, '0')}.${String(this.getMonth() + 1).padStart(2, '0')}.${this.getFullYear()}`;
-}
+  return `${String(this.getDate()).padStart(2, "0")}.${String(this.getMonth() + 1).padStart(2, "0")}.${this.getFullYear()}`;
+};
 
 Date.prototype.addDays = function (days) {
-  let date = new Date(this.valueOf());
+  const date = new Date(this.valueOf());
   date.setDate(date.getDate() + days);
   return date;
-}
+};
 
 function sleep(ms) {
   return new Promise((resolve) => {
@@ -43,13 +42,13 @@ function sleep(ms) {
 /**
  * Wait for an in progress download to finish and move the file to the correct
  * destination.
- * 
- * @param {fs.PathLike} tmpDir Download directory. 
+ *
+ * @param {fs.PathLike} tmpDir Download directory.
  * @param {fs.PathLike} outDir Final destination directory.
  * @param {Date} date Date of the issue.
  */
 function moveDownload(tmpDir, outDir, date) {
-  return new Promise(resolve => {
+  return new Promise((resolve) => {
     let needsOffset = false;
 
     // Dates in filenames are off by one before 1894
@@ -58,7 +57,10 @@ function moveDownload(tmpDir, outDir, date) {
       needsOffset = true;
     }
 
-    let srcFile = path.join(tmpDir, `Gesamtausgabe_NZZ_-_Neue_Zürcher_Zeitung_${date.isoDate()}.pdf`);
+    const srcFile = path.join(
+      tmpDir,
+      `Gesamtausgabe_NZZ_-_Neue_Zürcher_Zeitung_${date.isoDate()}.pdf`,
+    );
 
     if (needsOffset) {
       date = date.addDays(1);
@@ -68,7 +70,7 @@ function moveDownload(tmpDir, outDir, date) {
       setTimeout(() => moveDownload(tmpDir, outDir, date), 2000);
     }
 
-    let destFile = path.join(outDir, `${date.isoDate()}.pdf`);
+    const destFile = path.join(outDir, `${date.isoDate()}.pdf`);
     try {
       fs.copyFileSync(srcFile, destFile);
     } catch {
@@ -80,18 +82,26 @@ function moveDownload(tmpDir, outDir, date) {
 
 /**
  * Enter the dates of the issue to download.
- * 
+ *
  * @param {WebDriver} driver Selenium driver to use.
  * @param {Date} date Date of the issue.
  */
 async function enterDate(driver, date) {
-  let dateString = date.nzzDate();
+  const dateString = date.nzzDate();
 
-  let startDate = await driver.wait(until.elementLocated(By.css('input.fup-s-date-start')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
+  const startDate = await driver.wait(
+    until.elementLocated(By.css("input.fup-s-date-start")),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
   await startDate.clear();
   await startDate.sendKeys(dateString);
 
-  let endDate = await driver.wait(until.elementLocated(By.css('input.fup-s-date-end')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
+  const endDate = await driver.wait(
+    until.elementLocated(By.css("input.fup-s-date-end")),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
   await endDate.clear();
   await endDate.sendKeys(dateString + Key.ENTER);
   await sleep(500);
@@ -99,54 +109,88 @@ async function enterDate(driver, date) {
 
 /**
  * Login to the NZZ archive.
- * 
+ *
  * @param {WebDriver} driver Selenium driver to use.
  * @param {String} user Username for the login.
  * @param {String} password Password for the user.
  */
 async function login(driver, user, password) {
-  console.log('logging in...');
+  console.log("logging in...");
 
   await driver.get(URL);
   await sleep(500);
 
-  let loginButton = await driver.findElement(By.css('.fup-menu-login-container'));
+  const loginButton = await driver.findElement(
+    By.css(".fup-menu-login-container"),
+  );
   await driver.wait(until.elementIsVisible(loginButton), WAIT_TIMEOUT);
-  await sleep(1000);
   await loginButton.click();
 
-  let emailField = await driver.wait(until.elementLocated(By.id('c1-login-field')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
-  await driver.wait(until.elementIsVisible(emailField), WAIT_TIMEOUT);
-  await emailField.sendKeys(user + Key.ENTER);
+  const iframe = await driver.findElement(By.css('iframe[id^="piano"]'));
+  await driver.switchTo().frame(iframe);
 
-  let pwField = await driver.wait(until.elementLocated(By.id('c1-password-field')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
-  await pwField.sendKeys(password + Key.ENTER);
+  const emailField = await driver.wait(
+    until.elementLocated(By.css('input[name="email"]')),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
+
+  await driver.wait(until.elementIsVisible(emailField), WAIT_TIMEOUT);
+  await emailField.sendKeys(user);
+
+  const pwField = await driver.wait(
+    until.elementLocated(By.css('input[type="password"]')),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
+  await pwField.sendKeys(password);
+
+  const submitButton = await driver.wait(
+    until.elementLocated(By.css('button[class="btn prime"]')),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
+  await driver.wait(until.elementIsVisible(submitButton), WAIT_TIMEOUT);
+  await submitButton.click();
+  await driver.switchTo().defaultContent();
 }
 
 /**
- * Start the downloa of a full issue.
- * 
+ * Start the download of a full issue.
+ *
  * @param {WebDriver} driver Selenium driver to use.
  */
 async function download(driver) {
-  let menu = await driver.wait(until.elementLocated(By.css('.fup-menu-item-download')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
+  const menu = await driver.wait(
+    until.elementLocated(By.css(".fup-menu-item-download")),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
   await menu.click();
 
-  let download = await driver.wait(until.elementLocated(By.css('.fup-s-menu-download-edition')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
+  const download = await driver.wait(
+    until.elementLocated(By.css(".fup-s-menu-download-edition")),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
   await download.click();
 
-  let back = await driver.wait(until.elementLocated(By.css('.fup-s-menu-back')), WAIT_TIMEOUT, TIMEOUT_MSG, RETRY_DELAY);
+  const back = await driver.wait(
+    until.elementLocated(By.css(".fup-s-menu-back")),
+    WAIT_TIMEOUT,
+    TIMEOUT_MSG,
+  );
   await driver.wait(until.elementIsVisible(back), WAIT_TIMEOUT);
-  await sleep(500)
+  await sleep(500);
 }
 
 /**
  * Download all issues in a certain time span.
- * 
- * @param {WebDriver} driver Selenium driver to use. 
+ *
+ * @param {WebDriver} driver Selenium driver to use.
  * @param {Date} from Earliest issue to download.
  * @param {Date} to Latest issue to download.
- * @param {fs.PathLike} tmpDir Download directory. 
+ * @param {fs.PathLike} tmpDir Download directory.
  * @param {fs.PathLike} outDir Final destination directory.
  */
 async function findIssues(driver, from, to, tmpDir, outDir) {
@@ -154,18 +198,22 @@ async function findIssues(driver, from, to, tmpDir, outDir) {
 
   while (from.toDateString() !== to.toDateString()) {
     from = from.addDays(1);
-	console.log(`checking ${from.isoDate()}...`);
+    console.log(`checking ${from.isoDate()}...`);
 
     await enterDate(driver, from);
 
     try {
-      let articles = await driver.wait(until.elementsLocated(By.css('.fup-archive-result-item-article-title')), SEARCH_WAIT_TIMEOUT, SEARCH_TIMEOUT_MSG, RETRY_DELAY);
+      const articles = await driver.wait(
+        until.elementsLocated(By.css(".fup-archive-result-item-article-title")),
+        SEARCH_WAIT_TIMEOUT,
+        SEARCH_TIMEOUT_MSG,
+      );
       await articles[0].click();
-      await sleep(500)
+      await sleep(500);
 
       await download(driver);
       console.log(`\tdownloading...`);
-      await sleep(500)
+      await sleep(500);
 
       // do this in the background
       moveDownload(tmpDir, outDir, from);
@@ -181,7 +229,7 @@ async function findIssues(driver, from, to, tmpDir, outDir) {
 
 /**
  * Setup the headless browser and download all issues in the specified time span.
- * 
+ *
  * @param {Date} from Earliest issue to download.
  * @param {Date} to Latest issue to download.
  * @param {String} user Username for the nzz archive.
@@ -193,24 +241,24 @@ async function run(from, to, user, password, outDir) {
     fs.mkdirSync(outDir);
   }
 
-  let tmpDir = tmp.dirSync();
+  const tmpDir = tmp.dirSync();
   console.log(`downloading to ${outDir} (tmp dir: ${tmpDir.name})...`);
 
-  let fxOptions = new fx.Options()
-    .addArguments('-headless')
-    .setPreference('pdfjs.disabled', true)
-    .setPreference('browser.helperApps.neverAsk.openFile', 'application/pdf')
-    .setPreference('browser.download.folderList', 2)
-    .setPreference('browser.download.manager.showWhenStartingout', false)
-    .setPreference('browser.download.dir', tmpDir.name)
-    .setPreference('browser.helperApps.neverAsk.saveToDisk', 'application/pdf');
+  const fxOptions = new fx.Options()
+    // .addArguments("-headless")
+    .setPreference("pdfjs.disabled", true)
+    .setPreference("browser.helperApps.neverAsk.openFile", "application/pdf")
+    .setPreference("browser.download.folderList", 2)
+    .setPreference("browser.download.manager.showWhenStartingout", false)
+    .setPreference("browser.download.dir", tmpDir.name)
+    .setPreference("browser.helperApps.neverAsk.saveToDisk", "application/pdf");
 
   const caps = new Capabilities();
   caps.setPageLoadStrategy("normal");
 
-  let driver = await new Builder()
+  const driver = await new Builder()
     .withCapabilities(caps)
-    .forBrowser('firefox')
+    .forBrowser("firefox")
     .setFirefoxOptions(fxOptions)
     .build();
 
@@ -218,49 +266,52 @@ async function run(from, to, user, password, outDir) {
     await login(driver, user, password);
     await findIssues(driver, from, to, tmpDir.name, outDir);
     await sleep(1000);
-  }
-  finally {
+  } finally {
     driver.quit();
-    fs.rmdirSync(tmpDir.name, { recursive: true });
+    fs.rmSync(tmpDir.name, { recursive: true });
   }
 }
 
 /**
  * Parse arguments and start the downloading of the issues.
  */
-(async function init() {
-  let now = new Date();
-  let nowString = now.isoDate();
+(function init() {
+  const now = new Date();
+  const nowString = now.isoDate();
 
   const argv = yargs(hideBin(process.argv))
-    .usage('Usage: $0 -f [date] -t [date] -o [path] -u [usernane] -p [password]')
-    .demandOption(['u', 'p'])
-    .help('h')
-    .describe('f', 'Earliest issue to download.')
-    .describe('t', 'Latest issue to download.')
-    .describe('o', 'Download directory.')
-    .describe('u', 'Username for the nzz archive.')
-    .describe('p', 'Password for the user.')
-    .alias('h', 'help')
-    .alias('f', 'from')
-    .alias('t', 'to')
-    .alias('o', 'out')
-    .alias('u', 'user')
-    .alias('p', 'password')
-    .default('f', nowString)
-    .default('t', nowString)
-    .default('o', './nzz')
-    .epilog('Copyright (c) Sebastian Hugentobler <sebastian@vanwa.ch> 2020')
-    .example("$0 -u 'myuser@example.com' -p 'mypassword' -f 1780-01-01 -t 1780-02-30", 'Download all existing issues from 01-01-1780 until 30-02-1780 to the default directory "./nzz"')
-    .argv;
+    .usage(
+      "Usage: $0 -f [date] -t [date] -o [path] -u [usernane] -p [password]",
+    )
+    .demandOption(["u", "p"])
+    .help("h")
+    .describe("f", "Earliest issue to download.")
+    .describe("t", "Latest issue to download.")
+    .describe("o", "Download directory.")
+    .describe("u", "Username for the nzz archive.")
+    .describe("p", "Password for the user.")
+    .alias("h", "help")
+    .alias("f", "from")
+    .alias("t", "to")
+    .alias("o", "out")
+    .alias("u", "user")
+    .alias("p", "password")
+    .default("f", nowString)
+    .default("t", nowString)
+    .default("o", "./nzz")
+    .epilog("Copyright (c) Sebastian Hugentobler <shu@vanwa.ch> 2024")
+    .example(
+      "$0 -u 'myuser@example.com' -p 'mypassword' -f 1780-01-01 -t 1780-02-30",
+      'Download all existing issues from 01-01-1780 until 30-02-1780 to the default directory "./nzz"',
+    ).argv;
 
-  let from = new Date(argv.from);
-  let to = new Date(argv.to);
+  const from = new Date(argv.from);
+  const to = new Date(argv.to);
 
   if (from > to) {
     console.error('"from" date must be before "to" date');
     process.exit(1);
   }
 
-  run(from, to, argv.user, argv.password, argv.out)
+  run(from, to, argv.user, argv.password, argv.out);
 })();
diff --git a/package-lock.json b/package-lock.json
index 70f9fe2..9627b2c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,9 +9,9 @@
       "version": "0.1.3",
       "license": "MPL-2.0",
       "dependencies": {
-        "selenium-webdriver": "^4.0.0-alpha.8",
-        "tmp": "^0.2.1",
-        "yargs": "^16.2.0"
+        "selenium-webdriver": "4.22.0",
+        "tmp": "0.2.3",
+        "yargs": "17.7.2"
       }
     },
     "node_modules/ansi-regex": {
@@ -36,28 +36,17 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
-    "node_modules/balanced-match": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
-    },
-    "node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
     "node_modules/cliui": {
-      "version": "7.0.4",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
-      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
       "dependencies": {
         "string-width": "^4.2.0",
-        "strip-ansi": "^6.0.0",
+        "strip-ansi": "^6.0.1",
         "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
       }
     },
     "node_modules/color-convert": {
@@ -76,15 +65,10 @@
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
     },
-    "node_modules/concat-map": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
-    },
     "node_modules/core-util-is": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
+      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ=="
     },
     "node_modules/emoji-regex": {
       "version": "8.0.0",
@@ -99,11 +83,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/fs.realpath": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
-    },
     "node_modules/get-caller-file": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
@@ -112,38 +91,10 @@
         "node": "6.* || 8.* || >= 10.*"
       }
     },
-    "node_modules/glob": {
-      "version": "7.1.6",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
-      "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
-      "dependencies": {
-        "fs.realpath": "^1.0.0",
-        "inflight": "^1.0.4",
-        "inherits": "2",
-        "minimatch": "^3.0.4",
-        "once": "^1.3.0",
-        "path-is-absolute": "^1.0.0"
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@@ -667,45 +457,32 @@
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@@ -717,15 +494,10 @@
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@@ -734,23 +506,23 @@
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 }
diff --git a/package.json b/package.json
index b311fa7..0c6de55 100644
--- a/package.json
+++ b/package.json
@@ -6,8 +6,8 @@
   "author": "Sebastian Hugentobler",
   "license": "MPL-2.0",
   "dependencies": {
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-    "tmp": "^0.2.1",
-    "yargs": "^16.2.0"
+    "selenium-webdriver": "4.22.0",
+    "tmp": "0.2.3",
+    "yargs": "17.7.2"
   }
 }