diff --git a/src/accounting/static/js/account-order.js b/src/accounting/static/js/account-order.js
index c2f8029..5ab38d9 100644
--- a/src/accounting/static/js/account-order.js
+++ b/src/accounting/static/js/account-order.js
@@ -22,10 +22,10 @@
  */
 
 // Initializes the page JavaScript.
-document.addEventListener("DOMContentLoaded", function () {
+document.addEventListener("DOMContentLoaded", () => {
     const list = document.getElementById("accounting-order-list");
     if (list !== null) {
-        const onReorder = function () {
+        const onReorder = () => {
             const accounts = Array.from(list.children);
             for (let i = 0; i < accounts.length; i++) {
                 const no = document.getElementById("accounting-order-" + accounts[i].dataset.id + "-no");
diff --git a/src/accounting/static/js/currency-form.js b/src/accounting/static/js/currency-form.js
index c97e582..b87b342 100644
--- a/src/accounting/static/js/currency-form.js
+++ b/src/accounting/static/js/currency-form.js
@@ -22,7 +22,7 @@
  */
 
 // Initializes the page JavaScript.
-document.addEventListener("DOMContentLoaded", function () {
+document.addEventListener("DOMContentLoaded", () => {
     document.getElementById("accounting-code")
         .onchange = validateCode;
     document.getElementById("accounting-name")
diff --git a/src/accounting/static/js/material-fab-speed-dial.js b/src/accounting/static/js/material-fab-speed-dial.js
index 6b9b86b..0b3ebf7 100644
--- a/src/accounting/static/js/material-fab-speed-dial.js
+++ b/src/accounting/static/js/material-fab-speed-dial.js
@@ -22,7 +22,7 @@
  */
 
 // Initializes the page JavaScript.
-document.addEventListener("DOMContentLoaded", function () {
+document.addEventListener("DOMContentLoaded", () => {
     initializeMaterialFabSpeedDial();
 });
 
@@ -34,7 +34,7 @@ document.addEventListener("DOMContentLoaded", function () {
 function initializeMaterialFabSpeedDial() {
     const btnFab = document.getElementById("accounting-btn-material-fab-speed-dial");
     const fab = document.getElementById(btnFab.dataset.target);
-    btnFab.onclick = function () {
+    btnFab.onclick = () => {
         if (fab.classList.contains("show")) {
             fab.classList.remove("show");
         } else {
diff --git a/src/accounting/static/js/transaction-order.js b/src/accounting/static/js/transaction-order.js
index 725b4f7..a92cb8c 100644
--- a/src/accounting/static/js/transaction-order.js
+++ b/src/accounting/static/js/transaction-order.js
@@ -22,10 +22,10 @@
  */
 
 // Initializes the page JavaScript.
-document.addEventListener("DOMContentLoaded", function () {
+document.addEventListener("DOMContentLoaded", () => {
     const list = document.getElementById("accounting-order-list");
     if (list !== null) {
-        const onReorder = function () {
+        const onReorder = () => {
             const accounts = Array.from(list.children);
             for (let i = 0; i < accounts.length; i++) {
                 const no = document.getElementById("accounting-order-" + accounts[i].dataset.id + "-no");