diff --git a/src/static/webldappasswd.js b/src/static/webldappasswd.js
index c5c604d..8e557d4 100644
--- a/src/static/webldappasswd.js
+++ b/src/static/webldappasswd.js
@@ -44,27 +44,27 @@ MODAL_STATES = {
 }
 
 function showModal(state_name, parameters) {
-  let state = MODAL_STATES[state_name];
+  const state = MODAL_STATES[state_name];
 
-  let message = document.getElementById("message");
+  const message = document.getElementById("message");
 
-  let img = message.childNodes[0];
+  const img = message.childNodes[0];
   img.src = state.icon_url;
 
-  let text = message.childNodes[1];
+  const text = message.childNodes[1];
   text.textContent = " " + (state.message instanceof Function
                             ? state.message(parameters)
                             : state.message);
 
-  let button = document.getElementById("close_button");
+  const button = document.getElementById("close_button");
   button.disabled = state.button_disabled;
 
-  let modal = document.getElementById("modal");
+  const modal = document.getElementById("modal");
   modal.style.display = 'flex';
 }
 
 function hideModal() {
-  let modal = document.getElementById("modal");
+  const modal = document.getElementById("modal");
   modal.style.display = 'none';
 }
 
@@ -72,8 +72,8 @@ FIELDS = ['username', 'old_password', 'new_password']
 
 function mapFields(thunk) {
   for (fieldIndex in FIELDS) {
-    let fieldName = FIELDS[fieldIndex]
-    let field = document.querySelectorAll(`input[name=${fieldName}]`)[0];
+    const fieldName = FIELDS[fieldIndex]
+    const field = document.querySelectorAll(`input[name=${fieldName}]`)[0];
     thunk(field, fieldName);
   }
 }
@@ -85,7 +85,7 @@ function clearFields() {
 }
 
 function changePasswords() {
-  let query = {};
+  const query = {};
 
   mapFields((field, fieldName) => {
     query[fieldName] = field.value;