diff --git a/.travis.yml b/.travis.yml
index 7e3ebbe9..c8597c0b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,5 @@
 language: node_js
 node_js:
-  - "10"
-  - "11"
-  - "12"
   - "13"
   - "14"
 before_script:
diff --git a/README.md b/README.md
index fb4dc460..6b2e5370 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ You can get an idea of how PfP works by using the [online version](https://pfp.w
 Installing build prerequisites
 ------------------------------
 
-In order to build PfP you will need to install [Node.js](https://nodejs.org/) first (Node 10.0 or higher is required). You will also need [Gulp](http://gulpjs.com/), run the following command to install it (administrator privileges required):
+In order to build PfP you will need to install [Node.js](https://nodejs.org/) first (Node 13.0 or higher is required). You will also need [Gulp](http://gulpjs.com/), run the following command to install it (administrator privileges required):
 
     npm install --global gulp-cli
 
diff --git a/contentScript/.eslintrc.json b/contentScript/.eslintrc.json
index a94ef515..719e971c 100644
--- a/contentScript/.eslintrc.json
+++ b/contentScript/.eslintrc.json
@@ -1,7 +1,6 @@
 {
   "env": {
     "node": false,
-    "browser": true,
-    "commonjs": true
+    "browser": true
   }
 }
diff --git a/generateVowelsRegexp.js b/generateVowelsRegexp.js
index b3f53283..a7130623 100755
--- a/generateVowelsRegexp.js
+++ b/generateVowelsRegexp.js
@@ -8,7 +8,7 @@
 
 "use strict";
 
-const https = require("https");
+import https from "https";
 
 // Only Latin, Greek and Cyrillic vowels for now, derivations of those will
 // be determined below.
diff --git a/globalLoader.js b/globalLoader.js
index ff5f7dd7..05d8bd01 100644
--- a/globalLoader.js
+++ b/globalLoader.js
@@ -6,7 +6,7 @@
 
 "use strict";
 
-module.exports = function(map)
+export default function(map)
 {
   return {
     name: "global-loader",
@@ -24,4 +24,4 @@ module.exports = function(map)
       return "export default " + map[id];
     }
   };
-};
+}
diff --git a/gulp-utils.js b/gulp-utils.js
index 2418b8bf..f7ace7f8 100644
--- a/gulp-utils.js
+++ b/gulp-utils.js
@@ -6,20 +6,22 @@
 
 "use strict";
 
-let fs = require("fs");
-let path = require("path");
-let {spawn} = require("child_process");
-let {Duplex, Transform} = require("stream");
-
-exports.readArg = function(prefix, defaultValue)
+import fs from "fs";
+import path from "path";
+import {spawn} from "child_process";
+import {Duplex, Transform} from "stream";
+import {TextEncoder, TextDecoder} from "util";
+import sandboxedModule from "sandboxed-module";
+
+export function readArg(prefix, defaultValue)
 {
   for (let arg of process.argv)
     if (arg.startsWith(prefix))
       return arg.substr(prefix.length);
   return defaultValue;
-};
+}
 
-function transform(modifier, opts)
+export function transform(modifier, opts)
 {
   if (!opts)
     opts = {};
@@ -53,9 +55,8 @@ function transform(modifier, opts)
   };
   return stream;
 }
-exports.transform = transform;
 
-exports.jsonModify = function(modifier, newName)
+export function jsonModify(modifier, newName)
 {
   return transform((filepath, contents) =>
   {
@@ -65,9 +66,9 @@ exports.jsonModify = function(modifier, newName)
       filepath = path.resolve(filepath, "..", newName);
     return [filepath, JSON.stringify(data, null, 2)];
   });
-};
+}
 
-exports.combineLocales = function()
+export function combineLocales()
 {
   let rootDir = path.join(process.cwd(), "locale");
   let locales = {};
@@ -120,9 +121,9 @@ exports.combineLocales = function()
   });
 
   return stream;
-};
+}
 
-exports.toChromeLocale = function()
+export function toChromeLocale()
 {
   return transform((filepath, contents) =>
   {
@@ -132,7 +133,7 @@ exports.toChromeLocale = function()
       data[key] = {message: strings[key]};
 
     let locale = path.basename(filepath, ".json");
-    let manifest = require("./package.json");
+    let manifest = JSON.parse(fs.readFileSync("./package.json"));
     data.name = {"message": manifest.title};
     data.description = {"message": manifest.description};
     if ("locales" in manifest && locale in manifest.locales)
@@ -149,9 +150,9 @@ exports.toChromeLocale = function()
       JSON.stringify(data, null, 2)
     ];
   });
-};
+}
 
-exports.runTests = function()
+export function runTests()
 {
   function escape_string(str)
   {
@@ -170,8 +171,6 @@ exports.runTests = function()
     }
   }
 
-  let {TextEncoder, TextDecoder} = require("util");
-
   class WorkerEventTarget
   {
     constructor(other)
@@ -224,7 +223,7 @@ exports.runTests = function()
     {
       super();
 
-      require("sandboxed-module").require(url, {
+      sandboxedModule.require(url, {
         globals: {
           self: new WorkerEventTarget(this)
         }
@@ -234,9 +233,8 @@ exports.runTests = function()
 
   let atob = str => Buffer.from(str, "base64").toString("binary");
   let btoa = str => Buffer.from(str, "binary").toString("base64");
-  let {URL} = require("url");
 
-  let nodeunit = require("sandboxed-module").require("nodeunit", {
+  let nodeunit = sandboxedModule.require("nodeunit", {
     globals: {
       console, process, Buffer, TextEncoder, TextDecoder, atob, btoa, URL,
       Worker: FakeWorker,
@@ -260,4 +258,4 @@ exports.runTests = function()
       });
     });
   });
-};
+}
diff --git a/gulpfile.js b/gulpfile.js
index b7485bbe..55ccb856 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -6,26 +6,32 @@
 
 "use strict";
 
-const fs = require("fs");
-const path = require("path");
-const url = require("url");
+import fs from "fs";
+import path from "path";
+import url from "url";
 
-const del = require("del");
-const gulp = require("gulp");
-const eslint = require("gulp-eslint");
-const htmlhint = require("gulp-htmlhint");
-const rollupStream = require("gulp-better-rollup");
-const sass = require("gulp-sass");
-const stylelint = require("gulp-stylelint");
-const zip = require("gulp-zip");
-const merge = require("merge-stream");
-const babel = require("@rollup/plugin-babel").default;
-const commonjs = require("@rollup/plugin-commonjs");
-const resolve = require("@rollup/plugin-node-resolve").default;
-const vue = require("rollup-plugin-vue");
+import del from "del";
+import gulp from "gulp";
+import eslint from "gulp-eslint";
+import htmlhint from "gulp-htmlhint";
+import rollupStream from "gulp-better-rollup";
+import sass from "gulp-sass";
+import stylelint from "gulp-stylelint";
+import zip from "gulp-zip";
+import merge from "merge-stream";
+import babel from "@rollup/plugin-babel";
+import commonjs from "@rollup/plugin-commonjs";
+import resolve from "@rollup/plugin-node-resolve";
+import vue from "rollup-plugin-vue";
 
-const replace = require("./replacePlugin");
-const utils = require("./gulp-utils");
+import globalLoader from "./globalLoader.js";
+import * as utils from "./gulp-utils.js";
+import localeLoader from "./localeLoader.js";
+import replace from "./replacePlugin.js";
+import workerLoader from "./workerLoader.js";
+
+const VERSION = JSON.parse(fs.readFileSync("./manifest.json")).version;
+const __dirname = process.cwd(); // import.meta unsupported by current eslint version
 
 function rollup(overrides = {})
 {
@@ -37,12 +43,12 @@ function rollup(overrides = {})
   return rollupStream({
     plugins: [
       ...prePlugins,
-      require("./globalLoader")({
+      globalLoader({
         vue: "Vue",
         jsqr: "JSQR",
         zxcvbn: "zxcvbn"
       }),
-      resolve(),
+      resolve.default(),
       commonjs({
         include: ["node_modules/**"]
       }),
@@ -260,11 +266,11 @@ gulp.task("build-web", gulp.series("validate", function buildWeb()
               [path.resolve(__dirname, "lib", "browserAPI.js")]: path.resolve(__dirname, "web", "backgroundBrowserAPI.js"),
               [path.resolve(__dirname, "ui", "browserAPI.js")]: path.resolve(__dirname, "web", "contentBrowserAPI.js")
             }),
-            require("./workerLoader")(/\/(scrypt|pbkdf2)\.js$/),
-            require("./localeLoader")(path.resolve(__dirname, "locale", "en_US"))
+            workerLoader(/\/(scrypt|pbkdf2)\.js$/),
+            localeLoader(path.resolve(__dirname, "locale", "en_US"))
           ],
           postPlugins: [
-            babel({
+            babel.default({
               babelrc: false,
               babelHelpers: "bundled",
               presets: ["@babel/preset-env"]
@@ -282,7 +288,6 @@ gulp.task("build-web", gulp.series("validate", function buildWeb()
 
 gulp.task("crx", gulp.series("build-chrome", function buildCRX()
 {
-  let manifest = require("./manifest.json");
   return merge(
     gulp.src([
       "build-chrome/**",
@@ -290,12 +295,11 @@ gulp.task("crx", gulp.series("build-chrome", function buildCRX()
       "!build-chrome/**/.*", "!build-chrome/**/*.zip", "!build-chrome/**/*.crx"
     ]),
     gulp.src("build-chrome/manifest.json").pipe(utils.jsonModify(removeReloader))
-  ).pipe(zip("pfp-" + manifest.version + ".zip")).pipe(gulp.dest("build-chrome"));
+  ).pipe(zip("pfp-" + VERSION + ".zip")).pipe(gulp.dest("build-chrome"));
 }));
 
 gulp.task("xpi", gulp.series("build-firefox", function buildXPI()
 {
-  let manifest = require("./manifest.json");
   return merge(
     gulp.src([
       "build-firefox/**",
@@ -303,16 +307,15 @@ gulp.task("xpi", gulp.series("build-firefox", function buildXPI()
       "!build-firefox/**/.*", "!build-firefox/**/*.xpi"
     ]),
     gulp.src("build-firefox/manifest.json").pipe(utils.jsonModify(removeReloader))
-  ).pipe(zip("pfp-" + manifest.version + ".xpi")).pipe(gulp.dest("build-firefox"));
+  ).pipe(zip("pfp-" + VERSION + ".xpi")).pipe(gulp.dest("build-firefox"));
 }));
 
 gulp.task("web", gulp.series("build-web", function zipWeb()
 {
-  let manifest = require("./manifest.json");
   return gulp.src([
     "build-web/**",
     "!build-web/**/.*", "!build-web/**/*.zip"
-  ]).pipe(zip("pfp-web-" + manifest.version + ".zip")).pipe(gulp.dest("build-web"));
+  ]).pipe(zip("pfp-web-" + VERSION + ".zip")).pipe(gulp.dest("build-web"));
 }));
 
 gulp.task("test", gulp.series("validate", "build-test", function doTest()
diff --git a/lib/.eslintrc.json b/lib/.eslintrc.json
index fa060123..7d1b7a8a 100644
--- a/lib/.eslintrc.json
+++ b/lib/.eslintrc.json
@@ -1,7 +1,6 @@
 {
   "env": {
     "node": false,
-    "commonjs": true,
     "webextensions": true
   }
 }
diff --git a/localeLoader.js b/localeLoader.js
index 19302dc0..8e1d9e0d 100644
--- a/localeLoader.js
+++ b/localeLoader.js
@@ -6,8 +6,8 @@
 
 "use strict";
 
-const fs = require("fs");
-const path = require("path");
+import fs from "fs";
+import path from "path";
 
 function walkDirectory(dir, callback)
 {
@@ -35,7 +35,7 @@ function walkDirectory(dir, callback)
   });
 }
 
-module.exports = function(localeRoot)
+export default function(localeRoot)
 {
   return {
     name: "locale-loader",
@@ -75,4 +75,4 @@ module.exports = function(localeRoot)
       });
     }
   };
-};
+}
diff --git a/package.json b/package.json
index 5f8f03bb..165dd728 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,7 @@
   "description": "Use a single master password to generate secure passwords for all websites - without losing track of passwords you cannot change.",
   "author": "Wladimir Palant",
   "license": "MPL-2.0",
+  "type": "module",
   "repository": {
     "type": "git",
     "url": "https://github.com/palant/easypasswords.git"
diff --git a/replacePlugin.js b/replacePlugin.js
index 4d2fc025..048a5cd9 100644
--- a/replacePlugin.js
+++ b/replacePlugin.js
@@ -6,9 +6,9 @@
 
 "use strict";
 
-const path = require("path");
+import path from "path";
 
-module.exports = function(map)
+export default function(map)
 {
   map = new Map(Object.entries(map).map(([key, value]) => [path.normalize(key), path.normalize(value)]));
 
@@ -19,7 +19,7 @@ module.exports = function(map)
       if (!id.endsWith(".js"))
         id += ".js";
       if (!importer)
-        importer = __dirname;
+        importer = process.cwd(); // import.meta unsupported by current eslint version
       let resolved = path.normalize(path.join(path.dirname(importer), ...id.split("/")));
       let mapped = map.get(resolved);
       if (mapped)
@@ -28,4 +28,4 @@ module.exports = function(map)
         return null;
     }
   };
-};
+}
diff --git a/ui/.eslintrc.json b/ui/.eslintrc.json
index fa060123..7d1b7a8a 100644
--- a/ui/.eslintrc.json
+++ b/ui/.eslintrc.json
@@ -1,7 +1,6 @@
 {
   "env": {
     "node": false,
-    "commonjs": true,
     "webextensions": true
   }
 }
diff --git a/web/.eslintrc.json b/web/.eslintrc.json
index a94ef515..719e971c 100644
--- a/web/.eslintrc.json
+++ b/web/.eslintrc.json
@@ -1,7 +1,6 @@
 {
   "env": {
     "node": false,
-    "browser": true,
-    "commonjs": true
+    "browser": true
   }
 }
diff --git a/workerLoader.js b/workerLoader.js
index 4a1f164c..5833fa1f 100644
--- a/workerLoader.js
+++ b/workerLoader.js
@@ -6,9 +6,9 @@
 
 "use strict";
 
-const rollup = require("rollup");
+import rollup from "rollup";
 
-module.exports = function(regexp)
+export default function(regexp)
 {
   return {
     name: "worker-loader",
@@ -40,4 +40,4 @@ module.exports = function(regexp)
       });
     }
   };
-};
+}