diff --git a/bin/release-it.js b/bin/release-it.js
index 445b86a7..307021a2 100755
--- a/bin/release-it.js
+++ b/bin/release-it.js
@@ -3,7 +3,7 @@
 import updater from 'update-notifier';
 import parseArgs from 'yargs-parser';
 import release from '../lib/index.js';
-import { readJSON } from '../lib/util';
+import { readJSON } from '../lib/util.js';
 
 const pkg = readJSON('../package.json');
 
diff --git a/lib/cli.js b/lib/cli.js
index 7e3f3b3c..1ddce05f 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -1,5 +1,5 @@
-import { readJSON } from '../lib/util';
-import Log from './log';
+import { readJSON } from '../lib/util.js';
+import Log from './log.js';
 
 const pkg = readJSON('../package.json');
 
diff --git a/lib/config.js b/lib/config.js
index 0c6057f4..29de6e51 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -1,11 +1,11 @@
 import { cosmiconfigSync } from 'cosmiconfig';
 import parseJson from 'parse-json';
-import parseToml from '@iarna/toml/parse-string';
+import parseToml from '@iarna/toml/parse-string.js';
 import yaml from 'yaml';
 import _ from 'lodash';
 import isCI from 'is-ci';
 import _debug from 'debug';
-import { readJSON, getSystemInfo } from './util';
+import { readJSON, getSystemInfo } from './util.js';
 
 const debug = _debug('release-it:config');
 const defaultConfig = readJSON('../config/release-it.json');
diff --git a/lib/deprecated.js b/lib/deprecated.js
index 93b6e584..096d72bd 100644
--- a/lib/deprecated.js
+++ b/lib/deprecated.js
@@ -1,6 +1,6 @@
 import Deprecated from 'deprecated-obj';
-import { readJSON } from './util';
-import Log from './log';
+import { readJSON } from './util.js';
+import Log from './log.js';
 
 const deprecated = readJSON('../config/deprecated.json');
 
diff --git a/lib/index.js b/lib/index.js
index 33a195ab..12a37ac2 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,6 +1,6 @@
-import { version, help } from './cli';
-import runTasks from './tasks';
-import Plugin from './plugin/Plugin';
+import { version, help } from './cli.js';
+import runTasks from './tasks.js';
+import Plugin from './plugin/Plugin.js';
 
 export default async options => {
   if (options.version) {
diff --git a/lib/metrics.js b/lib/metrics.js
index 1b5f168a..f5866f32 100644
--- a/lib/metrics.js
+++ b/lib/metrics.js
@@ -4,7 +4,7 @@ import { v4 as uuidv4 } from 'uuid';
 import osName from 'os-name';
 import isCi from 'is-ci';
 import _debug from 'debug';
-import { readJSON } from './util';
+import { readJSON } from './util.js';
 
 const debug = _debug('release-it:metrics');
 const pkg = readJSON('../package.json');
diff --git a/lib/plugin/GitBase.js b/lib/plugin/GitBase.js
index 7260cf2e..88656079 100644
--- a/lib/plugin/GitBase.js
+++ b/lib/plugin/GitBase.js
@@ -1,6 +1,6 @@
 import { EOL } from 'os';
-import { format, parseGitUrl } from '../util';
-import Plugin from './Plugin';
+import { format, parseGitUrl } from '../util.js';
+import Plugin from './Plugin.js';
 
 const options = { write: false };
 const changelogFallback = 'git log --pretty=format:"* %s (%h)"';
diff --git a/lib/plugin/GitRelease.js b/lib/plugin/GitRelease.js
index bc548a18..8aaef1f6 100644
--- a/lib/plugin/GitRelease.js
+++ b/lib/plugin/GitRelease.js
@@ -1,6 +1,6 @@
 import _ from 'lodash';
-import { readJSON } from '../util';
-import GitBase from './GitBase';
+import { readJSON } from '../util.js';
+import GitBase from './GitBase.js';
 
 const defaultConfig = readJSON('../../config.release-it.json');
 
diff --git a/lib/plugin/factory.js b/lib/plugin/factory.js
index 9261c632..c69c2d81 100644
--- a/lib/plugin/factory.js
+++ b/lib/plugin/factory.js
@@ -2,11 +2,11 @@ import path from 'path';
 import _ from 'lodash';
 import requireCwd from 'import-cwd';
 import _debug from 'debug';
-import Version from './version/Version';
-import Git from './git/Git';
-import GitLab from './gitlab/GitLab';
-import GitHub from './github/GitHub';
-import npm from './npm/npm';
+import Version from './version/Version.js';
+import Git from './git/Git.js';
+import GitLab from './gitlab/GitLab.js';
+import GitHub from './github/GitHub.js';
+import npm from './npm/npm.js';
 
 const debug = _debug('release-it:plugins');
 
diff --git a/lib/plugin/git/Git.js b/lib/plugin/git/Git.js
index fee4739a..3f5b312f 100644
--- a/lib/plugin/git/Git.js
+++ b/lib/plugin/git/Git.js
@@ -1,9 +1,9 @@
 import { EOL } from 'os';
 import _ from 'lodash';
 import findUp from 'find-up';
-import { format, e } from '../../util';
-import GitBase from '../GitBase';
-import prompts from './prompts';
+import { format, e } from '../../util.js';
+import GitBase from '../GitBase.js';
+import prompts from './prompts.js';
 
 const noop = Promise.resolve();
 const invalidPushRepoRe = /^\S+@/;
diff --git a/lib/plugin/git/prompts.js b/lib/plugin/git/prompts.js
index f92911f1..f0288389 100644
--- a/lib/plugin/git/prompts.js
+++ b/lib/plugin/git/prompts.js
@@ -1,4 +1,4 @@
-import { format, truncateLines } from '../../util';
+import { format, truncateLines } from '../../util.js';
 
 export default {
   commit: {
diff --git a/lib/plugin/github/GitHub.js b/lib/plugin/github/GitHub.js
index 94550f09..a21213b3 100644
--- a/lib/plugin/github/GitHub.js
+++ b/lib/plugin/github/GitHub.js
@@ -5,9 +5,9 @@ import globby from 'globby';
 import mime from 'mime-types';
 import _ from 'lodash';
 import retry from 'async-retry';
-import { format, parseVersion, readJSON, e } from '../../util';
-import Release from '../GitRelease';
-import prompts from './prompts';
+import { format, parseVersion, readJSON, e } from '../../util.js';
+import Release from '../GitRelease.js';
+import prompts from './prompts.js';
 
 const pkg = readJSON('../../../package.json');
 
diff --git a/lib/plugin/github/prompts.js b/lib/plugin/github/prompts.js
index c65cf0fa..5a53620d 100644
--- a/lib/plugin/github/prompts.js
+++ b/lib/plugin/github/prompts.js
@@ -1,4 +1,4 @@
-import { format } from '../../util';
+import { format } from '../../util.js';
 
 const message = context => {
   const { isPreRelease, isUpdate, github } = context;
diff --git a/lib/plugin/gitlab/GitLab.js b/lib/plugin/gitlab/GitLab.js
index 9a5fe712..a7e2f140 100644
--- a/lib/plugin/gitlab/GitLab.js
+++ b/lib/plugin/gitlab/GitLab.js
@@ -4,9 +4,9 @@ import got from 'got';
 import globby from 'globby';
 import FormData from 'form-data';
 import _ from 'lodash';
-import Release from '../GitRelease';
-import { format, e } from '../../util';
-import prompts from './prompts';
+import Release from '../GitRelease.js';
+import { format, e } from '../../util.js';
+import prompts from './prompts.js';
 
 const docs = 'https://git.io/release-it-gitlab';
 
diff --git a/lib/plugin/gitlab/prompts.js b/lib/plugin/gitlab/prompts.js
index c65b3d55..c7c10764 100644
--- a/lib/plugin/gitlab/prompts.js
+++ b/lib/plugin/gitlab/prompts.js
@@ -1,4 +1,4 @@
-import { format } from '../../util';
+import { format } from '../../util.js';
 
 export default {
   release: {
diff --git a/lib/plugin/npm/npm.js b/lib/plugin/npm/npm.js
index e57a969a..1dd0f3b3 100644
--- a/lib/plugin/npm/npm.js
+++ b/lib/plugin/npm/npm.js
@@ -1,9 +1,9 @@
 import path from 'path';
 import semver from 'semver';
 import urlJoin from 'url-join';
-import Plugin from '../Plugin';
-import { hasAccess, rejectAfter, parseVersion, e } from '../../util';
-import prompts from './prompts';
+import Plugin from '../Plugin.js';
+import { hasAccess, rejectAfter, parseVersion, readJSON, e } from '../../util.js';
+import prompts from './prompts.js';
 
 const docs = 'https://git.io/release-it-npm';
 
diff --git a/lib/plugin/version/Version.js b/lib/plugin/version/Version.js
index 3433450c..919cf973 100644
--- a/lib/plugin/version/Version.js
+++ b/lib/plugin/version/Version.js
@@ -1,6 +1,6 @@
 import semver from 'semver';
 import chalk from 'chalk';
-import Plugin from '../Plugin';
+import Plugin from '../Plugin.js';
 
 const { green, red, redBright } = chalk;
 
diff --git a/lib/shell.js b/lib/shell.js
index 0412f8b9..e8fdf8e4 100644
--- a/lib/shell.js
+++ b/lib/shell.js
@@ -1,7 +1,7 @@
 import sh from 'shelljs';
 import execa from 'execa';
 import _debug from 'debug';
-import { format } from './util';
+import { format } from './util.js';
 
 const debug = _debug('release-it:shell');
 
diff --git a/lib/spinner.js b/lib/spinner.js
index 1b028096..4f80c645 100644
--- a/lib/spinner.js
+++ b/lib/spinner.js
@@ -1,5 +1,5 @@
 import ora from 'ora';
-import { format } from './util';
+import { format } from './util.js';
 
 const noop = Promise.resolve();
 
diff --git a/lib/tasks.js b/lib/tasks.js
index ab0f3dee..0ac9c688 100644
--- a/lib/tasks.js
+++ b/lib/tasks.js
@@ -1,13 +1,13 @@
 import _ from 'lodash';
-import Factory from './plugin/factory';
-import Logger from './log';
-import Config from './config';
-import Shell from './shell';
-import Prompt from './prompt';
-import Spinner from './spinner';
-import Metrics from './metrics';
-import { reduceUntil, parseVersion } from './util';
-import handleDeprecated from './deprecated';
+import { getPlugins } from './plugin/factory.js';
+import Logger from './log.js';
+import Config from './config.js';
+import Shell from './shell.js';
+import Prompt from './prompt.js';
+import Spinner from './spinner.js';
+import Metrics from './metrics.js';
+import { reduceUntil, parseVersion } from './util.js';
+import handleDeprecated from './deprecated.js';
 
 const runTasks = async (opts, di) => {
   let container = {};
@@ -54,7 +54,7 @@ const runTasks = async (opts, di) => {
       if (plugin === _.last(plugins)) await runHook('after', name);
     };
 
-    const [internal, external] = await Factory.getPlugins(config, container);
+    const [internal, external] = await getPlugins(config, container);
     let plugins = [...external, ...internal];
 
     for (const plugin of plugins) {
diff --git a/lib/util.js b/lib/util.js
index 962576fb..6cf81e7c 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -4,7 +4,7 @@ import _ from 'lodash';
 import gitUrlParse from 'git-url-parse';
 import semver from 'semver';
 import osName from 'os-name';
-import Log from './log';
+import Log from './log.js';
 
 const readJSON = async file => JSON.parse(fs.readFileSync(file, 'utf8'));
 
diff --git a/test/cli.js b/test/cli.js
index dfe1fa9a..a2a5def0 100644
--- a/test/cli.js
+++ b/test/cli.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 import mockStdIo from 'mock-stdio';
-import { version, help } from '../lib/cli';
-import { readJSON } from './util';
+import { version, help } from '../lib/cli.js';
+import { readJSON } from '../lib/util.js';
 
 const pkg = readJSON('../package.json');
 
diff --git a/test/config.js b/test/config.js
index 9764ff8f..4e39d0aa 100644
--- a/test/config.js
+++ b/test/config.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 import mock from 'mock-fs';
-import Config from '../lib/config';
-import { readJSON } from './util';
+import Config from '../lib/config.js';
+import { readJSON } from '../lib/util.js';
 
 const defaultConfig = readJSON('../config/release-it.json');
 
diff --git a/test/deprecated.js b/test/deprecated.js
index 6ff8b3a0..7cadbca8 100644
--- a/test/deprecated.js
+++ b/test/deprecated.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 import sinon from 'sinon';
-import deprecated from '../lib/deprecated';
-import Log from '../lib/log';
+import deprecated from '../lib/deprecated.js';
+import Log from '../lib/log.js';
 
 test('should show deprecation warnings and return compliant object', t => {
   const log = sinon.createStubInstance(Log);
diff --git a/test/git.init.js b/test/git.init.js
index 0edb3761..1fb68369 100644
--- a/test/git.init.js
+++ b/test/git.init.js
@@ -1,9 +1,9 @@
 import test from 'ava';
 import sh from 'shelljs';
-import Shell from '../lib/shell';
-import Git from '../lib/plugin/git/Git';
-import { factory, readJSON } from './util';
-import { mkTmpDir, gitAdd } from './util/helpers';
+import Shell from '../lib/shell.js';
+import Git from '../lib/plugin/git/Git.js';
+import { factory, readJSON } from '../lib/util.js';
+import { mkTmpDir, gitAdd } from './util/helpers.js';
 
 const { git } = readJSON('../config/release-it.json');
 
diff --git a/test/git.js b/test/git.js
index 856ed3b2..2325e1b6 100644
--- a/test/git.js
+++ b/test/git.js
@@ -2,9 +2,9 @@ import { EOL } from 'os';
 import test from 'ava';
 import sinon from 'sinon';
 import sh from 'shelljs';
-import Git from '../lib/plugin/git/Git';
-import { mkTmpDir, readFile, gitAdd } from './util/helpers';
-import { factory } from './util';
+import Git from '../lib/plugin/git/Git.js';
+import { mkTmpDir, readFile, gitAdd } from './util/helpers.js';
+import { factory } from './util.js';
 
 test.beforeEach(() => {
   const tmp = mkTmpDir();
diff --git a/test/github.js b/test/github.js
index 977c6e09..21e3021c 100644
--- a/test/github.js
+++ b/test/github.js
@@ -1,8 +1,8 @@
 import test from 'ava';
 import sinon from 'sinon';
 import { RequestError } from '@octokit/request-error';
-import GitHub from '../lib/plugin/github/GitHub';
-import { factory, runTasks } from './util';
+import GitHub from '../lib/plugin/github/GitHub.js';
+import { factory, runTasks } from './util.js';
 import {
   interceptAuthentication,
   interceptCollaborator,
diff --git a/test/gitlab.js b/test/gitlab.js
index 78a0308f..4a899f73 100644
--- a/test/gitlab.js
+++ b/test/gitlab.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 import sinon from 'sinon';
 import nock from 'nock';
-import GitLab from '../lib/plugin/gitlab/GitLab';
+import GitLab from '../lib/plugin/gitlab/GitLab.js';
 import {
   interceptUser,
   interceptCollaborator,
@@ -9,7 +9,7 @@ import {
   interceptPublish,
   interceptAsset
 } from './stub/gitlab';
-import { factory, runTasks } from './util';
+import { factory, runTasks } from './util.js';
 
 const tokenHeader = 'Private-Token';
 const tokenRef = 'GITLAB_TOKEN';
diff --git a/test/log.js b/test/log.js
index 1c6ec23a..b3571dda 100644
--- a/test/log.js
+++ b/test/log.js
@@ -2,7 +2,7 @@ import { EOL } from 'os';
 import test from 'ava';
 import mockStdIo from 'mock-stdio';
 import stripAnsi from 'strip-ansi';
-import Log from '../lib/log';
+import Log from '../lib/log.js';
 
 test('should write to stdout', t => {
   const log = new Log();
diff --git a/test/metrics.js b/test/metrics.js
index 5a9537f4..17f43281 100644
--- a/test/metrics.js
+++ b/test/metrics.js
@@ -1,6 +1,6 @@
 import test from 'ava';
 import sinon from 'sinon';
-import Metrics from '../lib/metrics';
+import Metrics from '../lib/metrics.js';
 
 test('should send metrics', async t => {
   const stub = sinon.stub().resolves();
diff --git a/test/npm.js b/test/npm.js
index e61c2b75..3ba5d8e6 100644
--- a/test/npm.js
+++ b/test/npm.js
@@ -2,9 +2,9 @@ import path from 'path';
 import test from 'ava';
 import sinon from 'sinon';
 import mock from 'mock-fs';
-import npm from '../lib/plugin/npm/npm';
-import { factory, runTasks } from './util';
-import { getArgs } from './util/helpers';
+import npm from '../lib/plugin/npm/npm.js';
+import { factory, runTasks } from './util.js';
+import { getArgs } from './util/helpers.js';
 
 test('should return npm package url', t => {
   const options = { npm: { name: 'my-cool-package' } };
diff --git a/test/plugins.js b/test/plugins.js
index ff4b52dd..ee82784b 100644
--- a/test/plugins.js
+++ b/test/plugins.js
@@ -3,12 +3,12 @@ import test from 'ava';
 import sh from 'shelljs';
 import proxyquire from 'proxyquire';
 import sinon from 'sinon';
-import Log from '../lib/log';
-import Spinner from '../lib/spinner';
-import Config from '../lib/config';
-import Plugin from '../lib/plugin/Plugin';
-import { mkTmpDir, gitAdd } from './util/helpers';
-import ShellStub from './stub/shell';
+import Log from '../lib/log.js';
+import Spinner from '../lib/spinner.js';
+import Config from '../lib/config.js';
+import Plugin from '../lib/plugin/Plugin.js';
+import { mkTmpDir, gitAdd } from './util/helpers.js';
+import ShellStub from './stub/shell.js';
 
 const noop = Promise.resolve();
 
diff --git a/test/prompt.js b/test/prompt.js
index 189bd6a0..8c65ed0a 100644
--- a/test/prompt.js
+++ b/test/prompt.js
@@ -1,12 +1,12 @@
 import test from 'ava';
 import sinon from 'sinon';
-import Prompt from '../lib/prompt';
-import Config from '../lib/config';
-import git from '../lib/plugin/git/prompts';
-import github from '../lib/plugin/github/prompts';
-import gitlab from '../lib/plugin/gitlab/prompts';
-import npm from '../lib/plugin/npm/prompts';
-import { factory } from './util';
+import Prompt from '../lib/prompt.js';
+import Config from '../lib/config.js';
+import git from '../lib/plugin/git/prompts.js';
+import github from '../lib/plugin/github/prompts.js';
+import gitlab from '../lib/plugin/gitlab/prompts.js';
+import npm from '../lib/plugin/npm/prompts.js';
+import { factory } from './util.js';
 
 const prompts = { git, github, gitlab, npm };
 
diff --git a/test/shell.js b/test/shell.js
index 56dfb260..7b1d00e1 100644
--- a/test/shell.js
+++ b/test/shell.js
@@ -1,9 +1,9 @@
 import test from 'ava';
 import sh from 'shelljs';
 import sinon from 'sinon';
-import Shell from '../lib/shell';
-import Log from '../lib/log';
-import { factory } from './util';
+import Shell from '../lib/shell.js';
+import Log from '../lib/log.js';
+import { factory } from './util.js';
 
 const { stdout } = sh.exec('pwd');
 const cwd = stdout.trim();
diff --git a/test/spinner.js b/test/spinner.js
index 0f4c0090..0f460e15 100644
--- a/test/spinner.js
+++ b/test/spinner.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 import sinon from 'sinon';
-import Spinner from '../lib/spinner';
-import Config from '../lib/config';
+import Spinner from '../lib/spinner.js';
+import Config from '../lib/config.js';
 
 test.beforeEach(t => {
   t.context.ora = {
diff --git a/test/stub/shell.js b/test/stub/shell.js
index 0e4769c3..772165e5 100644
--- a/test/stub/shell.js
+++ b/test/stub/shell.js
@@ -1,5 +1,5 @@
 import _debug from 'debug';
-import Shell from '../../lib/shell';
+import Shell from '../../lib/shell.js';
 
 const debug = _debug('release-it:shell-stub');
 
diff --git a/test/tasks.interactive.js b/test/tasks.interactive.js
index fa812ae3..3dce9e21 100644
--- a/test/tasks.interactive.js
+++ b/test/tasks.interactive.js
@@ -3,15 +3,15 @@ import test from 'ava';
 import sh from 'shelljs';
 import _ from 'lodash';
 import sinon from 'sinon';
-import Log from '../lib/log';
-import Spinner from '../lib/spinner';
-import Prompt from '../lib/prompt';
-import Config from '../lib/config';
-import runTasks from '../lib/tasks';
-import { mkTmpDir, gitAdd } from './util/helpers';
-import ShellStub from './stub/shell';
-import { interceptPublish as interceptGitLabPublish } from './stub/gitlab';
-import { interceptCreate as interceptGitHubCreate } from './stub/github';
+import Log from '../lib/log.js';
+import Spinner from '../lib/spinner.js';
+import Prompt from '../lib/prompt.js';
+import Config from '../lib/config.js';
+import runTasks from '../lib/tasks.js';
+import { mkTmpDir, gitAdd } from './util/helpers.js';
+import ShellStub from './stub/shell.js';
+import { interceptPublish as interceptGitLabPublish } from './stub/gitlab.js';
+import { interceptCreate as interceptGitHubCreate } from './stub/github.js';
 
 const noop = Promise.resolve();
 
diff --git a/test/tasks.js b/test/tasks.js
index a17b4530..dc45c9cf 100644
--- a/test/tasks.js
+++ b/test/tasks.js
@@ -4,13 +4,13 @@ import sh from 'shelljs';
 import proxyquire from 'proxyquire';
 import _ from 'lodash';
 import sinon from 'sinon';
-import Log from '../lib/log';
-import Spinner from '../lib/spinner';
-import Config from '../lib/config';
-import runTasks from '../lib/tasks';
-import Plugin from '../lib/plugin/Plugin';
-import { mkTmpDir, gitAdd, getArgs } from './util/helpers';
-import ShellStub from './stub/shell';
+import Log from '../lib/log.js';
+import Spinner from '../lib/spinner.js';
+import Config from '../lib/config.js';
+import runTasks from '../lib/tasks.js';
+import Plugin from '../lib/plugin/Plugin.js';
+import { mkTmpDir, gitAdd, getArgs } from './util/helpers.js';
+import ShellStub from './stub/shell.js';
 import {
   interceptUser as interceptGitLabUser,
   interceptCollaborator as interceptGitLabCollaborator,
diff --git a/test/util/index.js b/test/util/index.js
index c9baf4c1..c05aa472 100644
--- a/test/util/index.js
+++ b/test/util/index.js
@@ -1,12 +1,12 @@
 import _ from 'lodash';
 import sinon from 'sinon';
 import semver from 'semver';
-import { parseVersion } from '../../lib/util';
-import Log from '../../lib/log';
-import Config from '../../lib/config';
-import ShellStub from '../stub/shell';
-import Spinner from '../../lib/spinner';
-import Prompt from '../../lib/prompt';
+import { parseVersion } from '../../lib/util.js';
+import Log from '../../lib/log.js';
+import Config from '../../lib/config.js';
+import ShellStub from '../stub/shell.js';
+import Spinner from '../../lib/spinner.js';
+import Prompt from '../../lib/prompt.js';
 
 export let factory = (Definition, { namespace, options = {}, container = {} } = {}) => {
   _.defaults(options, { ci: true, verbose: false, 'dry-run': false, debug: false });
diff --git a/test/utils.js b/test/utils.js
index 6acb1815..5ce196d9 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -2,7 +2,7 @@ import { EOL } from 'os';
 import test from 'ava';
 import mockStdIo from 'mock-stdio';
 import stripAnsi from 'strip-ansi';
-import { format, truncateLines, parseGitUrl, parseVersion } from '../lib/util';
+import { format, truncateLines, parseGitUrl, parseVersion } from '../lib/util.js';
 
 test('format', t => {
   t.is(format('release v${version}', { version: '1.0.0' }), 'release v1.0.0');
diff --git a/test/version.js b/test/version.js
index 10efe961..d0d15a55 100644
--- a/test/version.js
+++ b/test/version.js
@@ -1,7 +1,7 @@
 import test from 'ava';
 import sinon from 'sinon';
-import Version from '../lib/plugin/version/Version';
-import { factory, runTasks } from './util';
+import Version from '../lib/plugin/version/Version.js';
+import { factory, runTasks } from './util.js';
 
 test('isValidVersion', t => {
   const v = factory(Version);