diff --git a/.gitignore b/.gitignore
index c977c85..15c4d8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
-.DS_Store
-*.d.ts
-*.log
 coverage/
 node_modules/
+*.d.ts
+*.log
+.DS_Store
 yarn.lock
diff --git a/index.js b/index.js
index b012fe6..2e6b430 100644
--- a/index.js
+++ b/index.js
@@ -7,7 +7,7 @@ import {collapseWhiteSpace} from 'collapse-white-space'
  * @typedef {Object.<string, number>} TrigramDictionary
  */
 
-var own = {}.hasOwnProperty
+const own = {}.hasOwnProperty
 
 /**
  * Clean `value`.
@@ -45,10 +45,10 @@ export function trigrams(value) {
  * @returns {TrigramDictionary}
  */
 export function asDictionary(value) {
-  var values = trigrams(value)
+  const values = trigrams(value)
   /** @type {TrigramDictionary} */
-  var dictionary = {}
-  var index = -1
+  const dictionary = {}
+  let index = -1
 
   while (++index < values.length) {
     if (own.call(dictionary, values[index])) {
@@ -68,11 +68,11 @@ export function asDictionary(value) {
  * @returns {TrigramTuples}
  */
 export function asTuples(value) {
-  var dictionary = asDictionary(value)
+  const dictionary = asDictionary(value)
   /** @type {TrigramTuples} */
-  var tuples = []
+  const tuples = []
   /** @type {string} */
-  var trigram
+  let trigram
 
   for (trigram in dictionary) {
     if (own.call(dictionary, trigram)) {
@@ -93,8 +93,8 @@ export function asTuples(value) {
  */
 export function tuplesAsDictionary(tuples) {
   /** @type {TrigramDictionary} */
-  var dictionary = {}
-  var index = -1
+  const dictionary = {}
+  let index = -1
 
   while (++index < tuples.length) {
     dictionary[tuples[index][0]] = tuples[index][1]
diff --git a/package.json b/package.json
index b9cff2e..c639cb7 100644
--- a/package.json
+++ b/package.json
@@ -60,11 +60,7 @@
     "trailingComma": "none"
   },
   "xo": {
-    "prettier": true,
-    "rules": {
-      "no-var": "off",
-      "prefer-arrow-callback": "off"
-    }
+    "prettier": true
   },
   "remarkConfig": {
     "plugins": [
diff --git a/test.js b/test.js
index ba310ae..a484c0b 100644
--- a/test.js
+++ b/test.js
@@ -8,8 +8,8 @@ import {
 } from './index.js'
 
 test('.clean', function (t) {
-  var ignore = '!"#$%&\'()*+,-./0123456789:;<=>?@'
-  var index = -1
+  const ignore = '!"#$%&\'()*+,-./0123456789:;<=>?@'
+  let index = -1
 
   t.equal(typeof clean('test'), 'string', 'should return a string')
   t.equal(clean(), '', 'should accept a missing value')