diff --git a/adminer/include/design.inc.php b/adminer/include/design.inc.php
index 9d67fde3..b1c3133e 100644
--- a/adminer/include/design.inc.php
+++ b/adminer/include/design.inc.php
@@ -76,7 +76,7 @@ const offlineMessage = '" . js_escape(lang('You are offline.')) . "';
 const thousandsSeparator = '" . js_escape(lang(',')) . "';")
 	;
 	echo "<div id='help' class='jush-" . JUSH . " jsonly hidden'></div>\n";
-	echo script("mixin(qs('#help'), {onmouseover: function () { helpOpen = 1; }, onmouseout: helpMouseout});");
+	echo script("mixin(qs('#help'), {onmouseover: () => { helpOpen = 1; }, onmouseout: helpMouseout});");
 	echo "<div id='content'>\n";
 	if ($breadcrumb !== null) {
 		$link = substr(preg_replace('~\b(username|db|ns)=[^&]*&~', '', ME), 0, -1);
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index 13923016..4e995ed4 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -974,7 +974,7 @@ function slow_query($query) {
 	$connection2 = null;
 	if (!$slow_query && support("kill") && is_object($connection2 = connect($adminer->credentials())) && ($db == "" || $connection2->select_db($db))) {
 		$kill = $connection2->result(connection_id()); // MySQL and MySQLi can use thread_id but it's not in PDO_MySQL
-		echo script("const timeout = setTimeout(function () { ajax('" . js_escape(ME) . "script=kill', function () {}, 'kill=$kill&token=$token'); }, 1000 * $timeout);");
+		echo script("const timeout = setTimeout(() => { ajax('" . js_escape(ME) . "script=kill', function () {}, 'kill=$kill&token=$token'); }, 1000 * $timeout);");
 	}
 	ob_flush();
 	flush();
diff --git a/adminer/include/html.inc.php b/adminer/include/html.inc.php
index 51d65c29..a574f115 100644
--- a/adminer/include/html.inc.php
+++ b/adminer/include/html.inc.php
@@ -150,7 +150,7 @@ function html_radios($name, $options, $value = "") {
 * @return string
 */
 function confirm($message = "", $selector = "qsl('input')") {
-	return script("$selector.onclick = function () { return confirm('" . ($message ? js_escape($message) : lang('Are you sure?')) . "'); };", "");
+	return script("$selector.onclick = () => confirm('" . ($message ? js_escape($message) : lang('Are you sure?')) . "');", "");
 }
 
 /** Print header for hidden fieldset (close by </div></fieldset>)
diff --git a/adminer/schema.inc.php b/adminer/schema.inc.php
index 34eb7bb1..fb453388 100644
--- a/adminer/schema.inc.php
+++ b/adminer/schema.inc.php
@@ -52,7 +52,7 @@ foreach (table_status('', true) as $table => $table_status) {
 ?>
 <div id="schema" style="height: <?php echo $top; ?>em;">
 <script<?php echo nonce(); ?>>
-qs('#schema').onselectstart = function () { return false; };
+qs('#schema').onselectstart = () => false;
 const tablePos = {<?php echo implode(",", $table_pos_js) . "\n"; ?>};
 const em = qs('#schema').offsetHeight / <?php echo $top; ?>;
 document.onmousemove = schemaMousemove;
diff --git a/adminer/static/editing.js b/adminer/static/editing.js
index 66d92b63..9f5d4f21 100644
--- a/adminer/static/editing.js
+++ b/adminer/static/editing.js
@@ -143,7 +143,7 @@ function dbChange() {
 */
 function selectFieldChange() {
 	const form = this.form;
-	const ok = (function () {
+	const ok = (() => {
 		for (const input of qsa('input', form)) {
 			if (input.value && /^fulltext/.test(input.name)) {
 				return true;
@@ -523,7 +523,7 @@ function partitionNameChange() {
 	const row = cloneNode(parentTag(this, 'tr'));
 	row.firstChild.firstChild.value = '';
 	parentTag(this, 'table').appendChild(row);
-	this.oninput = function () {};
+	this.oninput = () => { };
 }
 
 /** Show or hide comment fields
@@ -564,7 +564,7 @@ function dumpClick(event) {
 */
 function foreignAddRow() {
 	const row = cloneNode(parentTag(this, 'tr'));
-	this.onchange = function () { };
+	this.onchange = () => { };
 	for (const select of qsa('select', row)) {
 		select.name = select.name.replace(/\d+]/, '1$&');
 		select.selectedIndex = 0;
@@ -579,7 +579,7 @@ function foreignAddRow() {
 */
 function indexesAddRow() {
 	const row = cloneNode(parentTag(this, 'tr'));
-	this.onchange = function () { };
+	this.onchange = () => { };
 	for (const select of qsa('select', row)) {
 		select.name = select.name.replace(/indexes\[\d+/, '$&1');
 		select.selectedIndex = 0;
@@ -781,7 +781,7 @@ function helpMouseover(event, text, side) {
 function helpMouseout(event) {
 	helpOpen = 0;
 	helpIgnore = (this != getTarget(event));
-	setTimeout(function () {
+	setTimeout(() => {
 		if (!helpOpen) {
 			helpClose();
 		}
diff --git a/adminer/static/functions.js b/adminer/static/functions.js
index 12aa03ed..43cb2523 100644
--- a/adminer/static/functions.js
+++ b/adminer/static/functions.js
@@ -108,13 +108,12 @@ function verifyVersion(current, url, token) {
 	iframe.style.width = '7ex';
 	iframe.style.height = '1.25em';
 	iframe.style.display = 'none';
-	addEventListener('message', function (event) {
+	addEventListener('message', event => {
 		if (event.origin == 'https://www.adminer.org') {
 			const match = /version=(.+)/.exec(event.data);
 			if (match) {
 				cookie('adminer_version=' + match[1], 1);
-				ajax(url + 'script=version', function () {
-				}, event.data + '&token=' + token);
+				ajax(url + 'script=version', () => { }, event.data + '&token=' + token);
 			}
 		}
 	}, false);
@@ -391,8 +390,7 @@ function selectAddRow() {
 */
 function selectSearchKeydown(event) {
 	if (event.keyCode == 13 || event.keyCode == 10) {
-		this.onsearch = function () {
-		};
+		this.onsearch = () => { };
 	}
 }
 
@@ -498,7 +496,7 @@ function bodyClick(event) {
 	const target = getTarget(event);
 	if ((isCtrl(event) || event.shiftKey) && target.type == 'submit' && isTag(target, 'input')) {
 		target.form.target = '_blank';
-		setTimeout(function () {
+		setTimeout(() => {
 			// if (isCtrl(event)) { focus(); } doesn't work
 			target.form.target = '';
 		}, 0);
@@ -572,7 +570,7 @@ function fieldChange() {
 	}
 	// keep value in <select> (function)
 	parentTag(this, 'table').appendChild(row);
-	this.oninput = function () { };
+	this.oninput = () => { };
 }
 
 
@@ -600,7 +598,7 @@ function ajax(url, callback, data, message) {
 			request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
 		}
 		request.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
-		request.onreadystatechange = function () {
+		request.onreadystatechange = () => {
 			if (request.readyState == 4) {
 				if (/^2/.test(request.status)) {
 					callback(request);
@@ -620,7 +618,7 @@ function ajax(url, callback, data, message) {
 * @return boolean false for success
 */
 function ajaxSetHtml(url) {
-	return !ajax(url, function (request) {
+	return !ajax(url, request => {
 		const data = JSON.parse(request.responseText);
 		for (const key in data) {
 			setHtml(key, data[key]);
@@ -653,7 +651,7 @@ function ajaxForm(form, message, button) {
 		url = url.replace(/\?.*/, '') + '?' + data;
 		data = '';
 	}
-	return ajax(url, function (request) {
+	return ajax(url, request => {
 		setHtml('ajaxstatus', request.responseText);
 		if (window.jush) {
 			jush.highlight_tag(qsa('code', qs('#ajaxstatus')), 0);
@@ -684,7 +682,7 @@ function selectClick(event, text, warning) {
 	const original = td.innerHTML;
 	text = text || /\n/.test(original);
 	const input = document.createElement(text ? 'textarea' : 'input');
-	input.onkeydown = function (event) {
+	input.onkeydown = event => {
 		if (!event) {
 			event = window.event;
 		}
@@ -702,7 +700,7 @@ function selectClick(event, text, warning) {
 
 	if (text) {
 		let rows = 1;
-		value.replace(/\n/g, function () {
+		value.replace(/\n/g, () => {
 			rows++;
 		});
 		input.rows = rows;
@@ -723,7 +721,7 @@ function selectClick(event, text, warning) {
 	setupSubmitHighlight(td);
 	input.focus();
 	if (text == 2) { // long text
-		return ajax(location.href + '&' + encodeURIComponent(td.id) + '=', function (request) {
+		return ajax(location.href + '&' + encodeURIComponent(td.id) + '=', request => {
 			if (request.responseText) {
 				input.value = request.responseText;
 				input.name = td.id;
@@ -757,16 +755,14 @@ function selectLoadMore(limit, loading) {
 	a.innerHTML = loading;
 	if (href) {
 		a.removeAttribute('href');
-		return !ajax(href, function (request) {
+		return !ajax(href, request => {
 			const tbody = document.createElement('tbody');
 			tbody.innerHTML = request.responseText;
 			qs('#table').appendChild(tbody);
 			if (tbody.children.length < limit) {
 				a.parentNode.removeChild(a);
 			} else {
-				a.href = href.replace(/\d+$/, function (page) {
-					return +page + 1;
-				});
+				a.href = href.replace(/\d+$/, page => +page + 1);
 				a.innerHTML = title;
 			}
 		});
@@ -883,7 +879,7 @@ function cloneNode(el) {
 	return el2;
 }
 
-oninput = function (event) {
+oninput = event => {
 	const target = event.target;
 	const maxLength = target.getAttribute('data-maxlength');
 	alterClass(target, 'maxlength', target.value && maxLength != null && target.value.length > maxLength); // maxLength could be 0
diff --git a/editor/static/editing.js b/editor/static/editing.js
index 531e56d4..0d153fde 100644
--- a/editor/static/editing.js
+++ b/editor/static/editing.js
@@ -25,7 +25,7 @@ function whisper(url) {
 	const field = this;
 	field.orig = field.value;
 	field.previousSibling.value = field.value; // accept number, reject string
-	return ajax(url + encodeURIComponent(field.value), function (xmlhttp) {
+	return ajax(url + encodeURIComponent(field.value), xmlhttp => {
 		if (xmlhttp.status && field.orig == field.value) { // ignore old responses
 			field.nextSibling.innerHTML = xmlhttp.responseText;
 			field.nextSibling.style.display = '';
@@ -59,7 +59,7 @@ function whisperClick(event) {
 */
 function emailFileChange() {
 	const el = this.cloneNode(true);
-	this.onchange = function () { };
+	this.onchange = () => { };
 	el.value = '';
 	this.parentNode.appendChild(el);
 }
diff --git a/plugins/codemirror.php b/plugins/codemirror.php
index 8d55988c..ed5fdb24 100644
--- a/plugins/codemirror.php
+++ b/plugins/codemirror.php
@@ -76,7 +76,7 @@ for (const el of qsa('textarea')) {
 			}
 		});
 		cm.setSize(width, height);
-		cm.on('inputRead', function () {
+		cm.on('inputRead', () => {
 			const token = cm.getTokenAt(cm.getCursor());
 			if (/^[.`"\w]\w*$/.test(token.string)) {
 				CodeMirror.commands.autocomplete(cm);
diff --git a/plugins/edit-calendar.php b/plugins/edit-calendar.php
index 09cd88cb..466e7a58 100644
--- a/plugins/edit-calendar.php
+++ b/plugins/edit-calendar.php
@@ -34,7 +34,7 @@ class AdminerEditCalendar {
 			$lang = ($lang == "zh" ? "zh-CN" : ($lang == "zh-tw" ? "zh-TW" : $lang));
 			if ($lang != "en" && file_exists(sprintf($this->langPath, $lang))) {
 				echo Adminer\script_src(sprintf($this->langPath, $lang));
-				echo Adminer\script("jQuery(function () { jQuery.timepicker.setDefaults(jQuery.datepicker.regional['$lang']); });");
+				echo Adminer\script("jQuery(() => { jQuery.timepicker.setDefaults(jQuery.datepicker.regional['$lang']); });");
 			}
 		}
 	}
diff --git a/plugins/tables-filter.php b/plugins/tables-filter.php
index 97334602..52675d4c 100644
--- a/plugins/tables-filter.php
+++ b/plugins/tables-filter.php
@@ -53,7 +53,7 @@ function tablesFilterInput() {
 	tablesFilterTimeout = window.setTimeout(tablesFilter, 200);
 }
 
-sessionStorage && document.addEventListener('DOMContentLoaded', function () {
+sessionStorage && document.addEventListener('DOMContentLoaded', () => {
 	let db = qs('#dbs').querySelector('select');
 	db = db.options[db.selectedIndex].text;
 	if (db == sessionStorage.getItem('adminer_tables_filter_db') && sessionStorage.getItem('adminer_tables_filter')){
diff --git a/plugins/tinymce.php b/plugins/tinymce.php
index 5695b9a2..730b735e 100644
--- a/plugins/tinymce.php
+++ b/plugins/tinymce.php
@@ -61,8 +61,8 @@ tinyMCE.init({
 			return "<textarea$attrs id='fields-" . Adminer\h($field["field"]) . "' rows='12' cols='50'>" . Adminer\h($value) . "</textarea>" . Adminer\script("
 tinyMCE.remove(tinyMCE.get('fields-" . Adminer\js_escape($field["field"]) . "') || { });
 tinyMCE.EditorManager.execCommand('mceAddControl', true, 'fields-" . Adminer\js_escape($field["field"]) . "');
-qs('#form').onsubmit = function () {
-	tinyMCE.each(tinyMCE.editors, function (ed) {
+qs('#form').onsubmit = () => {
+	tinyMCE.each(tinyMCE.editors, ed => {
 		ed.remove();
 	});
 };
diff --git a/plugins/version-noverify.php b/plugins/version-noverify.php
index 3d83384a..f01759a7 100644
--- a/plugins/version-noverify.php
+++ b/plugins/version-noverify.php
@@ -9,6 +9,6 @@
 class AdminerVersionNoverify {
 
 	function head($dark = null) {
-		echo Adminer\script("verifyVersion = function () {};");
+		echo Adminer\script("verifyVersion = () => { };");
 	}
 }