diff --git a/.eslintrc.json b/.eslintrc.json
index fc69158..9aa7609 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,8 +1,8 @@
 {
 	"root": true,
 	"extends": [
-		"wikimedia/client-common",
-		"wikimedia/language/es2022",
+		"wikimedia/client",
+		"wikimedia/jquery",
 		"wikimedia/mediawiki"
 	]
 }
diff --git a/resources/.eslintrc.json b/resources/.eslintrc.json
index 1512a2c..4d373b5 100644
--- a/resources/.eslintrc.json
+++ b/resources/.eslintrc.json
@@ -1,8 +1,7 @@
 {
 	"root": true,
 	"extends": [
-		"wikimedia/client-common",
-		"wikimedia/language/es2022",
+		"wikimedia/client-es5",
 		"wikimedia/mediawiki",
 		"wikimedia/jquery"
 	],
diff --git a/resources/main.js b/resources/main.js
index 75e9da8..f4eadc0 100644
--- a/resources/main.js
+++ b/resources/main.js
@@ -1,11 +1,11 @@
 /* Write | CC0 license | https://git.qiuwen.net.cn/Qiuwen/mediawiki-skins-Write */
 
-$( () => {
+$( function () {
 	/*
 	 * Site navigation
 	 * adds proper Bootstrap CSS class to links added via mw.util.addPortletLink()
 	 */
-	const writeNavigation = () => {
+	var writeNavigation = function () {
 		$(
 			'#p-personal li a:not(.dropdown-item), aside li a:not(.dropdown-item)'
 		).addClass( 'dropdown-item' );
@@ -15,14 +15,14 @@ $( () => {
 	/*
 	 * Hide aside menu with no dropdown items
 	 */
-	const hideAsideDropdown = () => {
+	var hideAsideDropdown = function () {
 		$( 'aside .dropdown' ).has( 'div:empty' ).hide();
 	};
 
 	/*
 	 * Remove echo notifications popup on smaller screens
 	 */
-	const writeRemoveEchoPopup = () => {
+	var writeRemoveEchoPopup = function () {
 		if ( $( window ).width() <= 650 ) {
 			$( 'a.mw-echo-notifications-badge' ).off( 'click' );
 		}
@@ -32,7 +32,7 @@ $( () => {
 	 * Hamburger menu
 	 * opens navigation sidebar and login/user menu
 	 */
-	const writeTogglehamb = () => {
+	var writeTogglehamb = function () {
 		$( '#mw-navigation nav' ).toggle( 'fast' );
 	};
 
@@ -48,7 +48,7 @@ $( () => {
 
 	// repeat every 1 s for 10 s after DOM content loaded
 	window.writeVarI = 0;
-	window.writeTimer = window.setInterval( () => {
+	window.writeTimer = window.setInterval( function () {
 		writeNavigation();
 		writeRemoveEchoPopup();
 		window.writeVarI++;
diff --git a/skin.json b/skin.json
index 6af0ef7..8b6ad10 100644
--- a/skin.json
+++ b/skin.json
@@ -104,7 +104,6 @@
 			]
 		},
 		"skins.write.js": {
-			"es6": true,
 			"targets": ["desktop", "mobile"],
 			"packageFiles": ["resources/main.js"]
 		}