diff --git a/public_html/js/cookies.js b/public_html/js/cookies.js
index 790e8ef..c3f22b1 100644
--- a/public_html/js/cookies.js
+++ b/public_html/js/cookies.js
@@ -1,8 +1,8 @@
 function getCookie(name) {
     nom = name + "=";
-    var liste = document.cookie.split (';');
-    for (var i = 0; i < liste.length; i++) {
-        var c = liste[i];
+    let liste = document.cookie.split (';');
+    for (let i = 0; i < liste.length; i++) {
+        let c = liste[i];
         while (c.charAt(0) == ' ') c = c.substring(1, c.length);
         if (c.indexOf(nom) == 0) return c.substring(nom.length, c.length);
     }
diff --git a/public_html/js/phone.js b/public_html/js/phone.js
index f1cfbed..91d12e2 100644
--- a/public_html/js/phone.js
+++ b/public_html/js/phone.js
@@ -124,7 +124,7 @@ class Phone{
 
 	clearMessages(){
 		let messages = document.getElementsByClassName("message");
-		for (var i = messages.length - 1; i >= 0; i--) {
+		for (let i = messages.length - 1; i >= 0; i--) {
 			messages[i].remove();
 		}
 	}
diff --git a/server/server.js b/server/server.js
index e8b9f80..23dd68f 100644
--- a/server/server.js
+++ b/server/server.js
@@ -48,7 +48,7 @@ function getUsername(req){
 
 function createNewPlayer(socket, name) {
   let pos = generatePosition();
-  var obj = {
+  let obj = {
     id: playerCount,
     x: pos[0],
     y: pos[1],
@@ -91,7 +91,7 @@ function kick_player(player_id, socket, reason){
 }
 
 function update(message, socket){
-  for (var i = players.length - 1; i >= 0; i--) {
+  for (let i = players.length - 1; i >= 0; i--) {
     if(message.data.health <= MAX_HEALTH) {
       if (players[i].id == message.data.id) {
         players[i] = message.data;
@@ -110,7 +110,7 @@ function newBullet(message, socket){
 
 function died(message, socket){
   broadcast(JSON.stringify(message), socket.id);
-  for (var i = players.length - 1; i >= 0; i--) {
+  for (let i = players.length - 1; i >= 0; i--) {
 
     if (players[i].id == message.data.id) {
       let pos = generatePosition();
@@ -127,7 +127,7 @@ function died(message, socket){
 }
 
 function deletePlayer(socket){
-  for (var i = players.length - 1; i >= 0; i--) {
+  for (let i = players.length - 1; i >= 0; i--) {
     broadcast(JSON.stringify({
       type: "removePlayer",
       data: {
diff --git a/server/testsite/app.js b/server/testsite/app.js
index 1454825..4876789 100644
--- a/server/testsite/app.js
+++ b/server/testsite/app.js
@@ -1,5 +1,5 @@
 const socket = new WebSocket('ws://localhost:8080?name=coucou'); //ws://129.151.227.50:9600
-var time = new Date();
+let time = new Date();
 socket.addEventListener('open', (event) => {
     console.log('connecté');
 });
diff --git a/tools/collidesTool/app.js b/tools/collidesTool/app.js
index 4ef341c..15e7e4b 100644
--- a/tools/collidesTool/app.js
+++ b/tools/collidesTool/app.js
@@ -1,26 +1,26 @@
-var ctx = document.getElementById("canvas").getContext("2d");
-var cv = document.getElementById("canvas");
+let ctx = document.getElementById("canvas").getContext("2d");
+let cv = document.getElementById("canvas");
 
 const fond = new Image();
 fond.src = "../../public_html/assets/map/map11.jpg";
-var mapWidth = fond.width
-var mapHeith = fond.height
+let mapWidth = fond.width
+let mapHeith = fond.height
 ctx.canvas.width = mapWidth
 ctx.canvas.height = mapHeith
 ctx.drawImage(fond, 0, 0, mapWidth, mapHeith);
 
 
-var mode = "circle"
+let mode = "circle"
 
-var data = {
+let data = {
     squares: [],
     circles: []
 }
 
-var start = []
-var stop = []
+let start = []
+let stop = []
 
-var w = []
+let w = []
 
 cv.addEventListener("mousedown", (e)=>{
     const rect = canvas.getBoundingClientRect();
@@ -42,7 +42,7 @@ cv.addEventListener("mouseup", (e)=>{
         ctx.fillStyle = "#FF0000"
         ctx.fillRect(start[0], start[1], w[0], w[1]);
     }else if(mode=='circle'){
-        var radius = Math.sqrt(w[0]**2 + w[1]**2);
+        let radius = Math.sqrt(w[0]**2 + w[1]**2);
         data.circles.push({
             x: start[0],
             y:start[1],
@@ -66,7 +66,7 @@ function rectMode(){
 }
 
 function download(filename, text) {
-    var element = document.createElement('a');
+    let element = document.createElement('a');
     element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
     element.setAttribute('download', filename);