diff --git a/bin/cli.js b/bin/cli.js
index a4ffb68..0d53443 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -1,8 +1,8 @@
 #!/usr/bin/env node
 
-var parseChangelog = require('..')
-var file = process.argv[2] || 'CHANGELOG.md'
-var help = process.argv[2] === '-h' || process.argv[2] === '--help'
+const parseChangelog = require('..')
+const file = process.argv[2] || 'CHANGELOG.md'
+const help = process.argv[2] === '-h' || process.argv[2] === '--help'
 
 if (help) {
   console.log('usage: changelog-parser [filename]')
diff --git a/index.js b/index.js
index a14d61d..65c0dac 100644
--- a/index.js
+++ b/index.js
@@ -1,14 +1,14 @@
-var EOL = require('os').EOL
-var lineReader = require('line-reader')
-var removeMarkdown = require('remove-markdown')
+const EOL = require('os').EOL
+const lineReader = require('line-reader')
+const removeMarkdown = require('remove-markdown')
 
 // patterns
-var semver = /\[?v?([\w\d.-]+\.[\w\d.-]+[a-zA-Z0-9])\]?/
-var date = /.*[ ](\d\d?\d?\d?[-/.]\d\d?[-/.]\d\d?\d?\d?).*/
-var subhead = /^###/
-var listitem = /^[*-]/
+const semver = /\[?v?([\w\d.-]+\.[\w\d.-]+[a-zA-Z0-9])\]?/
+const date = /.*[ ](\d\d?\d?\d?[-/.]\d\d?[-/.]\d\d?\d?\d?).*/
+const subhead = /^###/
+const listitem = /^[*-]/
 
-var defaultOptions = { removeMarkdown: true }
+const defaultOptions = { removeMarkdown: true }
 
 /**
  * Changelog parser.
@@ -24,10 +24,10 @@ function parseChangelog (options, callback) {
   if (typeof options === 'undefined') throw new Error('missing options argument')
   if (typeof options === 'string') options = { filePath: options }
   if (typeof options === 'object') {
-    var hasFilePath = typeof options.filePath !== 'undefined'
-    var hasText = typeof options.text !== 'undefined'
-    var invalidFilePath = typeof options.filePath !== 'string'
-    var invalidText = typeof options.text !== 'string'
+    const hasFilePath = typeof options.filePath !== 'undefined'
+    const hasText = typeof options.text !== 'undefined'
+    const invalidFilePath = typeof options.filePath !== 'string'
+    const invalidText = typeof options.text !== 'string'
 
     if (!hasFilePath && !hasText) {
       throw new Error('must provide filePath or text')
@@ -42,8 +42,8 @@ function parseChangelog (options, callback) {
     }
   }
 
-  var opts = Object.assign({}, defaultOptions, options)
-  var changelog = parse(opts)
+  const opts = Object.assign({}, defaultOptions, options)
+  const changelog = parse(opts)
 
   if (typeof callback === 'function') {
     changelog
@@ -65,15 +65,15 @@ function parseChangelog (options, callback) {
  * @returns {Promise<object>} - parsed changelog object
  */
 function parse (options) {
-  var filePath = options.filePath
-  var text = options.text
-  var data = {
+  const filePath = options.filePath
+  const text = options.text
+  const data = {
     log: { versions: [] },
     current: null
   }
 
   // allow `handleLine` to mutate log/current data as `this`.
-  var cb = handleLine.bind(data, options)
+  const cb = handleLine.bind(data, options)
 
   return new Promise(function (resolve, reject) {
     function done () {
@@ -138,7 +138,7 @@ function handleLine (options, line) {
     // - 'handleize' subhead.
     // - add subhead to 'parsed' data if not already present.
     if (subhead.exec(line)) {
-      var key = line.replace('###', '').trim()
+      const key = line.replace('###', '').trim()
 
       if (!this.current.parsed[key]) {
         this.current.parsed[key] = []
diff --git a/package.json b/package.json
index 0c22df0..e1d2159 100644
--- a/package.json
+++ b/package.json
@@ -23,10 +23,10 @@
     "remove-markdown": "^0.2.2"
   },
   "devDependencies": {
-    "gh-release": "^3.1.1",
-    "standard": "^10.0.2",
-    "tap-spec": "^4.1.1",
-    "tape": "^4.6.0"
+    "gh-release": "^6.0.1",
+    "standard": "^16.0.4",
+    "tap-spec": "^5.0.0",
+    "tape": "^5.5.2"
   },
   "homepage": "https://github.com/hypermodules/changelog-parser",
   "keywords": [
diff --git a/test/fixtures/expected.js b/test/fixtures/expected.js
index 85b84e2..dab1450 100644
--- a/test/fixtures/expected.js
+++ b/test/fixtures/expected.js
@@ -1,4 +1,4 @@
-var EOL = require('os').EOL
+const EOL = require('os').EOL
 
 module.exports = {
   title: 'changelog title',
@@ -7,7 +7,7 @@ module.exports = {
     {
       version: null,
       title: 'unreleased',
-      'date': null,
+      date: null,
       body: '* foo',
       parsed: {
         _: [
@@ -18,7 +18,7 @@ module.exports = {
     {
       version: 'x.y.z',
       title: 'x.y.z - YYYY-MM-DD',
-      'date': null,
+      date: null,
       body: '* bar',
       parsed: {
         _: [
@@ -29,7 +29,7 @@ module.exports = {
     {
       version: 'a.b.c',
       title: '[a.b.c]',
-      'date': null,
+      date: null,
       body: '### Changes' + EOL + EOL + '* Update API' + EOL + '* Fix bug #1',
       parsed: {
         _: [
@@ -45,7 +45,7 @@ module.exports = {
     {
       version: '2.3.0',
       title: '2.3.0 - 2018-12-18',
-      'date': '2018-12-18',
+      date: '2018-12-18',
       body: '### Added' + EOL + EOL + '- Some changelog generators such as [standard-version](https://github.com/conventional-changelog/standard-version) would produce H1s for major versions and H2s for minor versions. We want the parser to be able to parse both.',
       parsed: {
         _: [
@@ -59,7 +59,7 @@ module.exports = {
     {
       version: '2.2.3-pre.1',
       title: '2.2.3-pre.1 - 2013-02-14',
-      'date': '2013-02-14',
+      date: '2013-02-14',
       body: '### Added' + EOL + '- Added an item.' + EOL + '* Added another item.' + EOL + EOL + '* Update API',
       parsed: {
         _: [
@@ -77,7 +77,7 @@ module.exports = {
     {
       version: '2.0.0-x.7.z.92',
       title: '2.0.0-x.7.z.92 - 2013-02-14',
-      'date': '2013-02-14',
+      date: '2013-02-14',
       body: '* bark bark' + EOL + '* woof' + EOL + '* arf',
       parsed: {
         _: [
@@ -90,7 +90,7 @@ module.exports = {
     {
       version: '1.3.0',
       title: 'v1.3.0',
-      'date': null,
+      date: null,
       body: '* make it so',
       parsed: {
         _: [
@@ -101,7 +101,7 @@ module.exports = {
     {
       version: '1.2.3',
       title: '[1.2.3](link)',
-      'date': null,
+      date: null,
       body: '* init',
       parsed: {
         _: [
diff --git a/test/fixtures/remove-markdown-expected.js b/test/fixtures/remove-markdown-expected.js
index 618c93f..21e5a56 100644
--- a/test/fixtures/remove-markdown-expected.js
+++ b/test/fixtures/remove-markdown-expected.js
@@ -1,4 +1,4 @@
-var EOL = require('os').EOL
+const EOL = require('os').EOL
 
 module.exports = {
   title: 'changelog title',
@@ -7,7 +7,7 @@ module.exports = {
     {
       version: null,
       title: 'unreleased',
-      'date': null,
+      date: null,
       body: '* foo',
       parsed: {
         _: [
@@ -18,7 +18,7 @@ module.exports = {
     {
       version: 'x.y.z',
       title: 'x.y.z - YYYY-MM-DD',
-      'date': null,
+      date: null,
       body: '* bar',
       parsed: {
         _: [
@@ -29,7 +29,7 @@ module.exports = {
     {
       version: 'a.b.c',
       title: '[a.b.c]',
-      'date': null,
+      date: null,
       body: '### Changes' + EOL + EOL + '* Update API' + EOL + '* Fix bug #1',
       parsed: {
         _: [
@@ -45,7 +45,7 @@ module.exports = {
     {
       version: '2.3.0',
       title: '2.3.0 - 2018-12-18',
-      'date': '2018-12-18',
+      date: '2018-12-18',
       body: '### Added' + EOL + EOL + '- Some changelog generators such as [standard-version](https://github.com/conventional-changelog/standard-version) would produce H1s for major versions and H2s for minor versions. We want the parser to be able to parse both.',
       parsed: {
         _: [
@@ -59,7 +59,7 @@ module.exports = {
     {
       version: '2.2.3-pre.1',
       title: '2.2.3-pre.1 - 2013-02-14',
-      'date': '2013-02-14',
+      date: '2013-02-14',
       body: '### Added' + EOL + '- Added an item.' + EOL + '* Added another item.' + EOL + EOL + '* Update API',
       parsed: {
         _: [
@@ -77,7 +77,7 @@ module.exports = {
     {
       version: '2.0.0-x.7.z.92',
       title: '2.0.0-x.7.z.92 - 2013-02-14',
-      'date': '2013-02-14',
+      date: '2013-02-14',
       body: '* bark bark' + EOL + '* woof' + EOL + '* arf',
       parsed: {
         _: [
@@ -90,7 +90,7 @@ module.exports = {
     {
       version: '1.3.0',
       title: 'v1.3.0',
-      'date': null,
+      date: null,
       body: '* make it so',
       parsed: {
         _: [
@@ -101,7 +101,7 @@ module.exports = {
     {
       version: '1.2.3',
       title: '[1.2.3](link)',
-      'date': null,
+      date: null,
       body: '* init',
       parsed: {
         _: [
diff --git a/test/index.js b/test/index.js
index 53ab4c2..ba0f688 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,17 +1,17 @@
-var parseChangelog = require('..')
-var test = require('tape')
-var path = require('path')
-var fs = require('fs')
-var expected = require('./fixtures/expected')
-var removeMarkdownExpected = require('./fixtures/remove-markdown-expected')
-var filePath = path.join(__dirname, 'fixtures', 'CHANGELOG.md')
+const parseChangelog = require('..')
+const test = require('tape')
+const path = require('path')
+const fs = require('fs')
+const expected = require('./fixtures/expected')
+const removeMarkdownExpected = require('./fixtures/remove-markdown-expected')
+const filePath = path.join(__dirname, 'fixtures', 'CHANGELOG.md')
 
 test('throws on bad params', function (t) {
   t.plan(3)
 
-  var missing = 'must provide filePath or text'
-  var invalidPath = 'invalid filePath, expected string'
-  var invalidText = 'invalid text, expected string'
+  const missing = 'must provide filePath or text'
+  const invalidPath = 'invalid filePath, expected string'
+  const invalidText = 'invalid text, expected string'
 
   t.throws(parseChangelog, missing, missing)
   t.throws(function () {
@@ -36,7 +36,7 @@ test('parses example changelog', function (t) {
 test('parses example changelog as text', function (t) {
   t.plan(1)
 
-  parseChangelog({text: fs.readFileSync(filePath, 'utf8')}, function (err, result) {
+  parseChangelog({ text: fs.readFileSync(filePath, 'utf8') }, function (err, result) {
     if (err) throw err
 
     t.deepEqual(result, expected)
@@ -47,7 +47,7 @@ test('parses example changelog as text', function (t) {
 test('returns a Promise when invoked without a valid `callback`', function (t) {
   t.plan(2)
 
-  var result = parseChangelog(filePath)
+  const result = parseChangelog(filePath)
 
   t.true(typeof result === 'object')
   t.true(result instanceof Promise)
@@ -69,11 +69,11 @@ test('callback and Promise methods should yield identical values', function (t)
     if (err) t.fail()
 
     parseChangelog(filePath)
-            .then(function (resultB) {
-              t.deepEqual(resultA, resultB)
-              t.end()
-            })
-            .catch(t.fail)
+      .then(function (resultB) {
+        t.deepEqual(resultA, resultB)
+        t.end()
+      })
+      .catch(t.fail)
   })
 })
 
@@ -91,7 +91,7 @@ test('accepts object as first argument', function (t) {
 test('accepts { removeMardown: false } option', function (t) {
   t.plan(1)
 
-  var options = {
+  const options = {
     filePath: filePath,
     removeMarkdown: false
   }