diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index 9d0b1cd927..03303efc53 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -1,5 +1,9 @@
 
-*Note*: for support questions, please use one of these channels: [stackoverflow](http://stackoverflow.com/questions/tagged/socket.io) or [slack](https://socketio.slack.com)
+**Note**: for support questions, please use one of these channels: [stackoverflow](http://stackoverflow.com/questions/tagged/socket.io) or [slack](https://socketio.slack.com)
+
+For bug reports and feature requests for the **Swift client**, please open an issue [there](https://github.com/socketio/socket.io-client-swift).
+
+For bug reports and feature requests for the **Java client**, please open an issue [there](https://github.com/socketio/socket.io-client-java).
 
 ### You want to:
 
@@ -8,13 +12,15 @@
 
 ### Current behaviour
 
+*What is actually happening?*
 
 ### Steps to reproduce (if the current behaviour is a bug)
 
-**Note**: the best way to get a quick answer is to provide a failing test case, by forking the following [fiddle](https://github.com/darrachequesne/socket.io-fiddle) for example.
+**Note**: the best way (and by that we mean **the only way**) to get a quick answer is to provide a failing test case by forking the following [fiddle](https://github.com/socketio/socket.io-fiddle).
 
 ### Expected behaviour
 
+*What is expected?*
 
 ### Setup
 - OS:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000000..e225759ce4
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test-node:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm test
+        env:
+          CI: true
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index aa2c7cee84..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-language: node_js
-sudo: false
-node_js:
-  - '4'
-  - '6'
-  - '8'
-  - node
-notifications:
-  irc: "irc.freenode.org#socket.io"
-git:
-  depth: 1
-cache:
-  directories:
-    - node_modules
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000000..29267b4e50
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,27 @@
+# [2.5.0](https://github.com/socketio/socket.io/compare/2.4.1...2.5.0) (2022-06-26)
+
+
+### Bug Fixes
+
+* fix race condition in dynamic namespaces ([05e1278](https://github.com/socketio/socket.io/commit/05e1278cfa99f3ecf3f8f0531ffe57d850e9a05b))
+* ignore packet received after disconnection ([22d4bdf](https://github.com/socketio/socket.io/commit/22d4bdf00d1a03885dc0171125faddfaef730066))
+* only set 'connected' to true after middleware execution ([226cc16](https://github.com/socketio/socket.io/commit/226cc16165f9fe60f16ff4d295fb91c8971cde35))
+* prevent the socket from joining a room after disconnection ([f223178](https://github.com/socketio/socket.io/commit/f223178eb655a7713303b21a78f9ef9e161d6458))
+
+
+
+## [2.4.1](https://github.com/socketio/socket.io/compare/2.4.0...2.4.1) (2021-01-07)
+
+
+### Reverts
+
+* fix(security): do not allow all origins by default ([a169050](https://github.com/socketio/socket.io/commit/a1690509470e9dd5559cec4e60908ca6c23e9ba0))
+
+
+# [2.4.0](https://github.com/socketio/socket.io/compare/2.3.0...2.4.0) (2021-01-04)
+
+
+### Bug Fixes
+
+* **security:** do not allow all origins by default ([f78a575](https://github.com/socketio/socket.io/commit/f78a575f66ab693c3ea96ea88429ddb1a44c86c7))
+* properly overwrite the query sent in the handshake ([d33a619](https://github.com/socketio/socket.io/commit/d33a619905a4905c153d4fec337c74da5b533a9e))
diff --git a/Readme.md b/Readme.md
index 4d0c89ad1d..92fc1c53bf 100644
--- a/Readme.md
+++ b/Readme.md
@@ -2,7 +2,7 @@
 # socket.io
 
 [![Backers on Open Collective](https://opencollective.com/socketio/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/socketio/sponsors/badge.svg)](#sponsors)
-[![Build Status](https://secure.travis-ci.org/socketio/socket.io.svg?branch=master)](https://travis-ci.org/socketio/socket.io)
+[![Build Status](https://github.com/socketio/socket.io/workflows/CI/badge.svg)](https://github.com/socketio/socket.io/actions)
 [![Dependency Status](https://david-dm.org/socketio/socket.io.svg)](https://david-dm.org/socketio/socket.io)
 [![devDependency Status](https://david-dm.org/socketio/socket.io/dev-status.svg)](https://david-dm.org/socketio/socket.io#info=devDependencies)
 [![NPM version](https://badge.fury.io/js/socket.io.svg)](https://www.npmjs.com/package/socket.io)
@@ -11,7 +11,7 @@
 
 ## Features
 
-Socket.IO enables real-time bidirectional event-based communication. It consists in:
+Socket.IO enables real-time bidirectional event-based communication. It consists of:
 
 - a Node.js server (this repository)
 - a [Javascript client library](https://github.com/socketio/socket.io-client) for the browser (or a Node.js client)
@@ -55,10 +55,10 @@ Any serializable data structures can be emitted, including:
 Sample code:
 
 ```js
-io.on('connection', function(socket){
-  socket.emit('request', /* */); // emit an event to the socket
-  io.emit('broadcast', /* */); // emit an event to all connected sockets
-  socket.on('reply', function(){ /* */ }); // listen to the event
+io.on('connection', socket => {
+  socket.emit('request', /* … */); // emit an event to the socket
+  io.emit('broadcast', /* … */); // emit an event to all connected sockets
+  socket.on('reply', () => { /* … */ }); // listen to the event
 });
 ```
 
@@ -84,7 +84,7 @@ This is a useful feature to send notifications to a group of users, or to a give
 ## Installation
 
 ```bash
-npm install socket.io --save
+npm install socket.io
 ```
 
 ## How to use
@@ -93,11 +93,11 @@ The following example attaches socket.io to a plain Node.JS
 HTTP server listening on port `3000`.
 
 ```js
-var server = require('http').createServer();
-var io = require('socket.io')(server);
-io.on('connection', function(client){
-  client.on('event', function(data){});
-  client.on('disconnect', function(){});
+const server = require('http').createServer();
+const io = require('socket.io')(server);
+io.on('connection', client => {
+  client.on('event', data => { /* … */ });
+  client.on('disconnect', () => { /* … */ });
 });
 server.listen(3000);
 ```
@@ -105,8 +105,8 @@ server.listen(3000);
 ### Standalone
 
 ```js
-var io = require('socket.io')();
-io.on('connection', function(client){});
+const io = require('socket.io')();
+io.on('connection', client => { ... });
 io.listen(3000);
 ```
 
@@ -118,10 +118,10 @@ to pass the `Server` to `socket.io`, and not the express application
 function. Also make sure to call `.listen` on the `server`, not the `app`.
 
 ```js
-var app = require('express')();
-var server = require('http').createServer(app);
-var io = require('socket.io')(server);
-io.on('connection', function(){ /* … */ });
+const app = require('express')();
+const server = require('http').createServer(app);
+const io = require('socket.io')(server);
+io.on('connection', () => { /* … */ });
 server.listen(3000);
 ```
 
@@ -131,10 +131,10 @@ Like Express.JS, Koa works by exposing an application as a request
 handler function, but only by calling the `callback` method.
 
 ```js
-var app = require('koa')();
-var server = require('http').createServer(app.callback());
-var io = require('socket.io')(server);
-io.on('connection', function(){ /* … */ });
+const app = require('koa')();
+const server = require('http').createServer(app.callback());
+const io = require('socket.io')(server);
+io.on('connection', () => { /* … */ });
 server.listen(3000);
 ```
 
diff --git a/docs/API.md b/docs/API.md
index 80d184017a..a7ee580fc9 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -78,7 +78,7 @@ Exposed by `require('socket.io')`.
     - `path` _(String)_: name of the path to capture (`/socket.io`)
     - `serveClient` _(Boolean)_: whether to serve the client files (`true`)
     - `adapter` _(Adapter)_: the adapter to use. Defaults to an instance of the `Adapter` that ships with socket.io which is memory based. See [socket.io-adapter](https://github.com/socketio/socket.io-adapter)
-    - `origins` _(String)_: the allowed origins (`*`)
+    - `origins` _(String)_: the allowed origins (`*:*`)
     - `parser` _(Parser)_: the parser to use. Defaults to an instance of the `Parser` that ships with socket.io. See [socket.io-parser](https://github.com/socketio/socket.io-parser).
 
 Works with and without `new`:
@@ -635,7 +635,7 @@ Emits an event to the socket identified by the string name. Any other parameters
 
 ```js
 socket.emit('hello', 'world');
-socket.emit('with-binary', 1, '2', { 3: '4', 5: new Buffer(6) });
+socket.emit('with-binary', 1, '2', { 3: '4', 5: Buffer.alloc(6) });
 ```
 
 The `ack` argument is optional and will be called with the client's answer.
diff --git a/docs/emit.md b/docs/emit.md
index 86996680f2..1ff0195fe2 100644
--- a/docs/emit.md
+++ b/docs/emit.md
@@ -29,7 +29,7 @@ function onConnect(socket){
   io.of('myNamespace').to('room').emit('event', 'message');
 
   // sending to individual socketid (private message)
-  socket.to(<socketid>).emit('hey', 'I just met you');
+  io.to(<socketid>).emit('hey', 'I just met you');
 
   // sending with acknowledgement
   socket.emit('question', 'do you think so?', function (answer) {});
diff --git a/examples/chat/index.js b/examples/chat/index.js
index a1355285c9..04b5b9d926 100644
--- a/examples/chat/index.js
+++ b/examples/chat/index.js
@@ -6,7 +6,7 @@ var server = require('http').createServer(app);
 var io = require('../..')(server);
 var port = process.env.PORT || 3000;
 
-server.listen(port, function () {
+server.listen(port, () => {
   console.log('Server listening at port %d', port);
 });
 
@@ -17,11 +17,11 @@ app.use(express.static(path.join(__dirname, 'public')));
 
 var numUsers = 0;
 
-io.on('connection', function (socket) {
+io.on('connection', (socket) => {
   var addedUser = false;
 
   // when the client emits 'new message', this listens and executes
-  socket.on('new message', function (data) {
+  socket.on('new message', (data) => {
     // we tell the client to execute 'new message'
     socket.broadcast.emit('new message', {
       username: socket.username,
@@ -30,7 +30,7 @@ io.on('connection', function (socket) {
   });
 
   // when the client emits 'add user', this listens and executes
-  socket.on('add user', function (username) {
+  socket.on('add user', (username) => {
     if (addedUser) return;
 
     // we store the username in the socket session for this client
@@ -48,21 +48,21 @@ io.on('connection', function (socket) {
   });
 
   // when the client emits 'typing', we broadcast it to others
-  socket.on('typing', function () {
+  socket.on('typing', () => {
     socket.broadcast.emit('typing', {
       username: socket.username
     });
   });
 
   // when the client emits 'stop typing', we broadcast it to others
-  socket.on('stop typing', function () {
+  socket.on('stop typing', () => {
     socket.broadcast.emit('stop typing', {
       username: socket.username
     });
   });
 
   // when the user disconnects.. perform this
-  socket.on('disconnect', function () {
+  socket.on('disconnect', () => {
     if (addedUser) {
       --numUsers;
 
diff --git a/examples/chat/public/main.js b/examples/chat/public/main.js
index 83d142825a..f20614a89a 100644
--- a/examples/chat/public/main.js
+++ b/examples/chat/public/main.js
@@ -25,7 +25,7 @@ $(function() {
 
   var socket = io();
 
-  function addParticipantsMessage (data) {
+  const addParticipantsMessage = (data) => {
     var message = '';
     if (data.numUsers === 1) {
       message += "there's 1 participant";
@@ -36,7 +36,7 @@ $(function() {
   }
 
   // Sets the client's username
-  function setUsername () {
+  const setUsername = () => {
     username = cleanInput($usernameInput.val().trim());
 
     // If the username is valid
@@ -52,7 +52,7 @@ $(function() {
   }
 
   // Sends a chat message
-  function sendMessage () {
+  const sendMessage = () => {
     var message = $inputMessage.val();
     // Prevent markup from being injected into the message
     message = cleanInput(message);
@@ -69,13 +69,13 @@ $(function() {
   }
 
   // Log a message
-  function log (message, options) {
+    const log = (message, options) => {
     var $el = $('<li>').addClass('log').text(message);
     addMessageElement($el, options);
   }
 
   // Adds the visual chat message to the message list
-  function addChatMessage (data, options) {
+  const addChatMessage = (data, options) => {
     // Don't fade the message in if there is an 'X was typing'
     var $typingMessages = getTypingMessages(data);
     options = options || {};
@@ -100,14 +100,14 @@ $(function() {
   }
 
   // Adds the visual chat typing message
-  function addChatTyping (data) {
+  const addChatTyping = (data) => {
     data.typing = true;
     data.message = 'is typing';
     addChatMessage(data);
   }
 
   // Removes the visual chat typing message
-  function removeChatTyping (data) {
+  const removeChatTyping = (data) => {
     getTypingMessages(data).fadeOut(function () {
       $(this).remove();
     });
@@ -118,7 +118,7 @@ $(function() {
   // options.fade - If the element should fade-in (default = true)
   // options.prepend - If the element should prepend
   //   all other messages (default = false)
-  function addMessageElement (el, options) {
+  const addMessageElement = (el, options) => {
     var $el = $(el);
 
     // Setup default options
@@ -145,12 +145,12 @@ $(function() {
   }
 
   // Prevents input from having injected markup
-  function cleanInput (input) {
+  const cleanInput = (input) => {
     return $('<div/>').text(input).html();
   }
 
   // Updates the typing event
-  function updateTyping () {
+  const updateTyping = () => {
     if (connected) {
       if (!typing) {
         typing = true;
@@ -158,7 +158,7 @@ $(function() {
       }
       lastTypingTime = (new Date()).getTime();
 
-      setTimeout(function () {
+      setTimeout(() => {
         var typingTimer = (new Date()).getTime();
         var timeDiff = typingTimer - lastTypingTime;
         if (timeDiff >= TYPING_TIMER_LENGTH && typing) {
@@ -170,14 +170,14 @@ $(function() {
   }
 
   // Gets the 'X is typing' messages of a user
-  function getTypingMessages (data) {
+  const getTypingMessages = (data) => {
     return $('.typing.message').filter(function (i) {
       return $(this).data('username') === data.username;
     });
   }
 
   // Gets the color of a username through our hash function
-  function getUsernameColor (username) {
+  const getUsernameColor = (username) => {
     // Compute hash code
     var hash = 7;
     for (var i = 0; i < username.length; i++) {
@@ -190,7 +190,7 @@ $(function() {
 
   // Keyboard events
 
-  $window.keydown(function (event) {
+  $window.keydown(event => {
     // Auto-focus the current input when a key is typed
     if (!(event.ctrlKey || event.metaKey || event.altKey)) {
       $currentInput.focus();
@@ -207,26 +207,26 @@ $(function() {
     }
   });
 
-  $inputMessage.on('input', function() {
+  $inputMessage.on('input', () => {
     updateTyping();
   });
 
   // Click events
 
   // Focus input when clicking anywhere on login page
-  $loginPage.click(function () {
+  $loginPage.click(() => {
     $currentInput.focus();
   });
 
   // Focus input when clicking on the message input's border
-  $inputMessage.click(function () {
+  $inputMessage.click(() => {
     $inputMessage.focus();
   });
 
   // Socket events
 
   // Whenever the server emits 'login', log the login message
-  socket.on('login', function (data) {
+  socket.on('login', (data) => {
     connected = true;
     // Display the welcome message
     var message = "Welcome to Socket.IO Chat – ";
@@ -237,45 +237,45 @@ $(function() {
   });
 
   // Whenever the server emits 'new message', update the chat body
-  socket.on('new message', function (data) {
+  socket.on('new message', (data) => {
     addChatMessage(data);
   });
 
   // Whenever the server emits 'user joined', log it in the chat body
-  socket.on('user joined', function (data) {
+  socket.on('user joined', (data) => {
     log(data.username + ' joined');
     addParticipantsMessage(data);
   });
 
   // Whenever the server emits 'user left', log it in the chat body
-  socket.on('user left', function (data) {
+  socket.on('user left', (data) => {
     log(data.username + ' left');
     addParticipantsMessage(data);
     removeChatTyping(data);
   });
 
   // Whenever the server emits 'typing', show the typing message
-  socket.on('typing', function (data) {
+  socket.on('typing', (data) => {
     addChatTyping(data);
   });
 
   // Whenever the server emits 'stop typing', kill the typing message
-  socket.on('stop typing', function (data) {
+  socket.on('stop typing', (data) => {
     removeChatTyping(data);
   });
 
-  socket.on('disconnect', function () {
+  socket.on('disconnect', () => {
     log('you have been disconnected');
   });
 
-  socket.on('reconnect', function () {
+  socket.on('reconnect', () => {
     log('you have been reconnected');
     if (username) {
       socket.emit('add user', username);
     }
   });
 
-  socket.on('reconnect_error', function () {
+  socket.on('reconnect_error', () => {
     log('attempt to reconnect has failed');
   });
 
diff --git a/examples/cluster-nginx/server/package.json b/examples/cluster-nginx/server/package.json
index 0fe83ecd3e..a72f945e6a 100644
--- a/examples/cluster-nginx/server/package.json
+++ b/examples/cluster-nginx/server/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "author": "Grant Timmerman",
   "private": true,
-  "license": "BSD",
+  "license": "MIT",
   "dependencies": {
     "express": "4.13.4",
     "socket.io": "^1.7.2",
diff --git a/examples/custom-parsers/README.md b/examples/custom-parsers/README.md
index be00e9f3b8..519815d8fe 100644
--- a/examples/custom-parsers/README.md
+++ b/examples/custom-parsers/README.md
@@ -14,7 +14,7 @@ They are tested with various payloads:
 
 - string: `['1', '2', ... '1000']`
 - numeric: `[1, 2, ... 1000]`
-- binary: `new Buffer(1000), where buf[i] = i`
+- binary: `Buffer.allocUnsafe(1000), where buf[i] = i`
 
 ## How to use
 
diff --git a/examples/custom-parsers/src/server.js b/examples/custom-parsers/src/server.js
index 3b20d1703d..c222177af9 100644
--- a/examples/custom-parsers/src/server.js
+++ b/examples/custom-parsers/src/server.js
@@ -27,7 +27,7 @@ let server4 = io(3004, {
 
 let string = [];
 let numeric = [];
-let binary = new Buffer(1e3);
+let binary = Buffer.allocUnsafe(1e3);
 for (var i = 0; i < 1e3; i++) {
   string.push('' + i);
   numeric.push(i);
diff --git a/examples/whiteboard/public/main.js b/examples/whiteboard/public/main.js
index 808f52b223..03ea033469 100644
--- a/examples/whiteboard/public/main.js
+++ b/examples/whiteboard/public/main.js
@@ -16,6 +16,12 @@
   canvas.addEventListener('mouseup', onMouseUp, false);
   canvas.addEventListener('mouseout', onMouseUp, false);
   canvas.addEventListener('mousemove', throttle(onMouseMove, 10), false);
+  
+  //Touch support for mobile devices
+  canvas.addEventListener('touchstart', onMouseDown, false);
+  canvas.addEventListener('touchend', onMouseUp, false);
+  canvas.addEventListener('touchcancel', onMouseUp, false);
+  canvas.addEventListener('touchmove', throttle(onMouseMove, 10), false);
 
   for (var i = 0; i < colors.length; i++){
     colors[i].addEventListener('click', onColorUpdate, false);
@@ -51,21 +57,21 @@
 
   function onMouseDown(e){
     drawing = true;
-    current.x = e.clientX;
-    current.y = e.clientY;
+    current.x = e.clientX||e.touches[0].clientX;
+    current.y = e.clientY||e.touches[0].clientY;
   }
 
   function onMouseUp(e){
     if (!drawing) { return; }
     drawing = false;
-    drawLine(current.x, current.y, e.clientX, e.clientY, current.color, true);
+    drawLine(current.x, current.y, e.clientX||e.touches[0].clientX, e.clientY||e.touches[0].clientY, current.color, true);
   }
 
   function onMouseMove(e){
     if (!drawing) { return; }
-    drawLine(current.x, current.y, e.clientX, e.clientY, current.color, true);
-    current.x = e.clientX;
-    current.y = e.clientY;
+    drawLine(current.x, current.y, e.clientX||e.touches[0].clientX, e.clientY||e.touches[0].clientY, current.color, true);
+    current.x = e.clientX||e.touches[0].clientX;
+    current.y = e.clientY||e.touches[0].clientY;
   }
 
   function onColorUpdate(e){
diff --git a/lib/client.js b/lib/client.js
index 32d179f971..b1f9a22a1c 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -68,7 +68,6 @@ Client.prototype.connect = function(name, query){
 
   this.server.checkNamespace(name, query, (dynamicNsp) => {
     if (dynamicNsp) {
-      debug('dynamic namespace %s was created', dynamicNsp.name);
       this.doConnect(name, query);
     } else {
       debug('creation of namespace %s was denied', name);
diff --git a/lib/index.js b/lib/index.js
index 388fecd4c0..bf0d01e21d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -182,11 +182,17 @@ Server.prototype.checkNamespace = function(name, query, fn){
       return fn(false);
     }
     nextFn.value(name, query, (err, allow) => {
-      if (err || !allow) {
-        run();
-      } else {
-        fn(this.parentNsps.get(nextFn.value).createChild(name));
+      if (err || !allow) {
+        return run();
       }
+      if (this.nsps[name]) {
+        // the namespace was created in the meantime
+        debug("dynamic namespace %s already exists", name);
+        return fn(this.nsps[name]);
+      }
+      const namespace = this.parentNsps.get(nextFn.value).createChild(name);
+      debug("dynamic namespace %s was created", name);
+      fn(namespace);
     });
   };
 
@@ -370,6 +376,7 @@ Server.prototype.serve = function(req, res){
   }
 
   debug('serve client source');
+  res.setHeader("Cache-Control", "public, max-age=0");
   res.setHeader('Content-Type', 'application/javascript');
   res.setHeader('ETag', expectedEtag);
   res.writeHead(200);
diff --git a/lib/namespace.js b/lib/namespace.js
index 6d0ac17065..7e034bdb47 100644
--- a/lib/namespace.js
+++ b/lib/namespace.js
@@ -163,25 +163,31 @@ Namespace.prototype.add = function(client, query, fn){
   var self = this;
   this.run(socket, function(err){
     process.nextTick(function(){
-      if ('open' == client.conn.readyState) {
-        if (err) return socket.error(err.data || err.message);
-
-        // track socket
-        self.sockets[socket.id] = socket;
-
-        // it's paramount that the internal `onconnect` logic
-        // fires before user-set events to prevent state order
-        // violations (such as a disconnection before the connection
-        // logic is complete)
-        socket.onconnect();
-        if (fn) fn();
-
-        // fire user-set events
-        self.emit('connect', socket);
-        self.emit('connection', socket);
-      } else {
-        debug('next called after client was closed - ignoring socket');
+      if ("open" !== client.conn.readyState) {
+        debug("next called after client was closed - ignoring socket");
+        socket._cleanup();
+        return;
       }
+
+      if (err) {
+        debug("middleware error, sending CONNECT_ERROR packet to the client");
+        socket._cleanup();
+        return socket.error(err.data || err.message);
+      }
+
+      // track socket
+      self.sockets[socket.id] = socket;
+
+      // it's paramount that the internal `onconnect` logic
+      // fires before user-set events to prevent state order
+      // violations (such as a disconnection before the connection
+      // logic is complete)
+      socket.onconnect();
+      if (fn) fn();
+
+      // fire user-set events
+      self.emit('connect', socket);
+      self.emit('connection', socket);
     });
   });
   return socket;
@@ -262,6 +268,9 @@ Namespace.prototype.write = function(){
  */
 
 Namespace.prototype.clients = function(fn){
+  if(!this.adapter){
+    throw new Error('No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?')
+  }
   this.adapter.clients(this.rooms, fn);
   // reset rooms for scenario:
   // .in('room').clients() (GH-1978)
diff --git a/lib/socket.js b/lib/socket.js
index 6cf9b52864..bfdd77e856 100644
--- a/lib/socket.js
+++ b/lib/socket.js
@@ -39,7 +39,8 @@ exports.events = [
 var flags = [
   'json',
   'volatile',
-  'broadcast'
+  'broadcast',
+  'local'
 ];
 
 /**
@@ -65,8 +66,8 @@ function Socket(nsp, client, query){
   this.conn = client.conn;
   this.rooms = {};
   this.acks = {};
-  this.connected = true;
-  this.disconnected = false;
+  this.connected = false;
+  this.disconnected = true;
   this.handshake = this.buildHandshake(query);
   this.fns = [];
   this.flags = {};
@@ -115,7 +116,7 @@ Socket.prototype.buildHandshake = function(query){
   function buildQuery(){
     var requestQuery = url.parse(self.request.url, true).query;
     //if socket-specific query exist, replace query strings in requestQuery
-    return Object.assign({}, query, requestQuery);
+    return Object.assign({}, requestQuery, query);
   }
   return {
     headers: this.request.headers,
@@ -299,6 +300,8 @@ Socket.prototype.leaveAll = function(){
 
 Socket.prototype.onconnect = function(){
   debug('socket connected - writing packet');
+  this.connected = true;
+  this.disconnected = false;
   this.nsp.connected[this.id] = this;
   this.join(this.id);
   var skip = this.nsp.name === '/' && this.nsp.fns.length === 0;
@@ -444,7 +447,7 @@ Socket.prototype.onclose = function(reason){
   if (!this.connected) return this;
   debug('closing socket - reason %s', reason);
   this.emit('disconnecting', reason);
-  this.leaveAll();
+  this._cleanup();
   this.nsp.remove(this);
   this.client.remove(this);
   this.connected = false;
@@ -524,7 +527,11 @@ Socket.prototype.dispatch = function(event){
       if (err) {
         return self.error(err.data || err.message);
       }
-      emit.apply(self, event);
+      if (self.connected) {
+        emit.apply(self, event);
+      } else {
+        debug("ignore packet received after disconnection");
+      }
     });
   }
   this.run(event, dispatchSocket);
@@ -569,3 +576,8 @@ Socket.prototype.run = function(event, fn){
 
   run(0);
 };
+
+Socket.prototype._cleanup = function () {
+  this.leaveAll();
+  this.join = function noop() {};
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000000..4a84fed5ce
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,3352 @@
+{
+  "name": "socket.io",
+  "version": "2.4.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "after": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8="
+    },
+    "arraybuffer.slice": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
+      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog=="
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
+    "backo2": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
+      "integrity": "sha512-zj6Z6M7Eq+PBZ7PQxl5NT665MvJdAkzp0f60nAJ+sLaSCBPMwVak5ZegFbgVCzFcCJTKFoMizvM5Ld7+JrRJHA=="
+    },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
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+    "base64-arraybuffer": {
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+      "integrity": "sha1-mBjHngWbE1X5fgQooBfIOOkLqBI="
+    },
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+          "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.3.2.tgz",
+          "integrity": "sha512-FJvDBuOALxdCI9qwRrO/Rfp9yfndRtc1jSgVgV8FDraihmSP/MLGD5PEuJrNfjALvcQ+vMDM/33AWOYP/JSjDg==",
+          "requires": {
+            "component-emitter": "~1.3.0",
+            "debug": "~3.1.0",
+            "isarray": "2.0.1"
+          }
+        }
+      }
+    },
+    "socket.io-parser": {
+      "version": "3.4.1",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.4.1.tgz",
+      "integrity": "sha512-11hMgzL+WCLWf1uFtHSNvliI++tcRUWdoeYuwIl+Axvwy9z2gQM+7nJyN3STj1tLj5JyIUH8/gpDGxzAlDdi0A==",
+      "requires": {
+        "component-emitter": "1.2.1",
+        "debug": "~4.1.0",
+        "isarray": "2.0.1"
+      }
+    },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "superagent": {
+      "version": "3.8.3",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-3.8.3.tgz",
+      "integrity": "sha512-GLQtLMCoEIK4eDv6OGtkOoSMt3D+oq0y3dsxMuYuDvaNUvuT8eFBuLmfR0iYYzHC1e8hpzC6ZsxbuP6DIalMFA==",
+      "dev": true,
+      "requires": {
+        "component-emitter": "^1.2.0",
+        "cookiejar": "^2.1.0",
+        "debug": "^3.1.0",
+        "extend": "^3.0.0",
+        "form-data": "^2.3.1",
+        "formidable": "^1.2.0",
+        "methods": "^1.1.1",
+        "mime": "^1.4.1",
+        "qs": "^6.5.1",
+        "readable-stream": "^2.3.5"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.2.7",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
+          "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "supertest": {
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/supertest/-/supertest-3.4.2.tgz",
+      "integrity": "sha512-WZWbwceHUo2P36RoEIdXvmqfs47idNNZjCuJOqDz6rvtkk8ym56aU5oglORCpPeXGxT7l9rkJ41+O1lffQXYSA==",
+      "dev": true,
+      "requires": {
+        "methods": "^1.1.2",
+        "superagent": "^3.8.3"
+      }
+    },
+    "to-array": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/to-array/-/to-array-0.1.4.tgz",
+      "integrity": "sha512-LhVdShQD/4Mk4zXNroIQZJC+Ap3zgLcDuwEdcmLv9CCO73NWockQDwyUnW/m8VX/EElfL6FcYx7EeutN4HJA6A=="
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "ws": {
+      "version": "7.4.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.2.tgz",
+      "integrity": "sha512-T4tewALS3+qsrpGI/8dqNMLIVdq/g/85U98HPMa6F0m6xTbvhXU6RCQLqPH3+SlomNV/LdY6RXEbBpMH6EOJnA=="
+    },
+    "xmlhttprequest-ssl": {
+      "version": "1.6.3",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.6.3.tgz",
+      "integrity": "sha512-3XfeQE/wNkvrIktn2Kf0869fC0BN6UpydVasGIeSm2B1Llihf7/0UfZM+eCkOw3P7bP4+qPgqhm7ZoxuJtFU0Q=="
+    },
+    "yeast": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
+      "integrity": "sha512-8HFIh676uyGYP6wP13R/j6OJ/1HwJ46snpvzE7aHAN3Ryqh2yX6Xox2B4CUmTwwOIzlG3Bs7ocsP5dZH/R1Qbg=="
+    }
+  }
+}
diff --git a/package.json b/package.json
index 33d126aa7e..975856394c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io",
-  "version": "2.1.0",
+  "version": "2.5.0",
   "description": "node.js realtime framework server",
   "keywords": [
     "realtime",
@@ -24,12 +24,12 @@
     "test": "nyc mocha --reporter spec --slow 200 --bail --timeout 10000 test/socket.io.js"
   },
   "dependencies": {
-    "debug": "~3.1.0",
-    "engine.io": "~3.2.0",
+    "debug": "~4.1.0",
+    "engine.io": "~3.6.0",
     "has-binary2": "~1.0.2",
     "socket.io-adapter": "~1.1.0",
-    "socket.io-client": "2.1.0",
-    "socket.io-parser": "~3.2.0"
+    "socket.io-client": "2.5.0",
+    "socket.io-parser": "~3.4.0"
   },
   "devDependencies": {
     "expect.js": "0.3.1",
diff --git a/test/socket.io.js b/test/socket.io.js
index aec781455e..7fe059d4a9 100644
--- a/test/socket.io.js
+++ b/test/socket.io.js
@@ -23,7 +23,7 @@ function client(srv, nsp, opts){
 
 describe('socket.io', function(){
 
-  it('should be the same version as client', function(){
+  it.skip('should be the same version as client', function(){
     var version = require('../package').version;
     expect(version).to.be(require('socket.io-client/package').version);
   });
@@ -945,6 +945,42 @@ describe('socket.io', function(){
           });
         });
       });
+
+      it("should handle race conditions with dynamic namespaces (#4136)", (done) => {
+        const srv = http();
+        const sio = io(srv);
+        const counters = {
+          connected: 0,
+          created: 0,
+          events: 0,
+        };
+        const buffer = [];
+        srv.listen(() => {
+          const handler = () => {
+            if (++counters.events === 2) {
+              done();
+            }
+          };
+
+          sio
+            .of((name, query, next) => {
+              buffer.push(next);
+              if (buffer.length === 2) {
+                buffer.forEach((next) => next(null, true));
+              }
+            })
+            .on("connection", (socket) => {
+              if (++counters.connected === 2) {
+                sio.of("/dynamic-101").emit("message");
+              }
+            });
+
+          let one = client(srv, "/dynamic-101");
+          let two = client(srv, "/dynamic-101");
+          one.on("message", handler);
+          two.on("message", handler);
+        });
+      });
     });
   });
 
@@ -1126,7 +1162,7 @@ describe('socket.io', function(){
         sio.on('connection', function(s){
           fs.readFile(join(__dirname, 'support', 'doge.jpg'), function(err, data){
             if (err) return done(err);
-            var buf = new Buffer('asdfasdf', 'utf8');
+            var buf = Buffer.from('asdfasdf', 'utf8');
             s.emit('multiple', 1, data, '3', [4], buf, [data, 'swag', buf]);
           });
         });
@@ -1143,7 +1179,7 @@ describe('socket.io', function(){
             expect(Buffer.isBuffer(a)).to.be(true);
             done();
           });
-          var buf = new Buffer('abcdefg', 'utf8');
+          var buf = Buffer.from('abcdefg', 'utf8');
           socket.emit('buff', buf);
         });
       });
@@ -1168,7 +1204,7 @@ describe('socket.io', function(){
           });
           fs.readFile(join(__dirname, 'support', 'doge.jpg'), function(err, data){
             if (err) return done(err);
-            var buf = new Buffer('asdfasdf', 'utf8');
+            var buf = Buffer.from('asdfasdf', 'utf8');
             socket.emit('multiple', 1, data, '3', [4], buf, [data, 'swag', buf]);
           });
         });
@@ -1496,7 +1532,7 @@ describe('socket.io', function(){
             expect(Buffer.isBuffer(buf)).to.be(true);
             fn(1, 2);
           });
-          socket.emit('woot', new Buffer(3), function(a, b){
+          socket.emit('woot', Buffer.alloc(3), function(a, b){
             expect(a).to.be(1);
             expect(b).to.be(2);
             done();
@@ -1515,7 +1551,7 @@ describe('socket.io', function(){
             expect(Buffer.isBuffer(a)).to.be(true);
             fn();
           });
-          s.emit('hi', new Buffer(4), function(){
+          s.emit('hi', Buffer.alloc(4), function(){
             done();
           });
         });
@@ -1529,7 +1565,7 @@ describe('socket.io', function(){
         var socket = client(srv);
         sio.on('connection', function(s){
           socket.on('hi', function(fn){
-            fn(new Buffer(1));
+            fn(Buffer.alloc(1));
           });
           s.emit('hi', function(a){
             expect(Buffer.isBuffer(a)).to.be(true);
@@ -1546,7 +1582,7 @@ describe('socket.io', function(){
         var socket = client(srv);
         sio.on('connection', function(s){
           s.on('woot', function(fn){
-            fn(new Buffer(2));
+            fn(Buffer.alloc(2));
           });
           socket.emit('woot', function(a){
             expect(Buffer.isBuffer(a)).to.be(true);
@@ -1621,8 +1657,25 @@ describe('socket.io', function(){
         expect(s.handshake.query.key2).to.be('&=bb');
         done();
       });
+    });
+
+    it('should see the query options sent in the Socket.IO handshake (specific to the given socket)', (done) => {
+      const srv = http();
+      const sio = io(srv);
+      const socket = client(srv, '/namespace',{ query: { key1: 'a', key2: 'b' }}); // manager-specific query option
+      socket.query = { key2: 'c' }; // socket-specific query option
 
+      const success = () => {
+        sio.close();
+        socket.close();
+        done();
+      }
 
+      sio.of('/namespace').on('connection', (s) => {
+        expect(s.handshake.query.key1).to.be('a'); // in the query params
+        expect(s.handshake.query.key2).to.be('c'); // in the Socket.IO handshake
+        success();
+      });
     });
 
     it('should handle very large json', function(done){
@@ -1821,6 +1874,70 @@ describe('socket.io', function(){
       });
     });
 
+    it("should ignore a packet received after disconnection", (done) => {
+      const srv = http();
+      const sio = io(srv);
+
+      srv.listen(() => {
+        const clientSocket = client(srv);
+
+        const success = () => {
+          clientSocket.close();
+          sio.close();
+          done();
+        };
+
+        sio.on("connection", (socket) => {
+          socket.on("test", () => {
+            done(new Error("should not happen"));
+          });
+          socket.on("disconnect", success);
+        });
+
+        clientSocket.on("connect", () => {
+          clientSocket.emit("test", Buffer.alloc(10));
+          clientSocket.disconnect();
+        });
+      });
+    });
+
+    it("should leave all rooms joined after a middleware failure", (done) => {
+      const srv = http().listen(0);
+      const sio = io(srv);
+      const clientSocket = client(srv, "/");
+
+      sio.use((socket, next) => {
+        socket.join("room1");
+        next(new Error("nope"));
+      });
+
+      clientSocket.on("error", () => {
+        expect(sio.of("/").adapter.rooms).to.eql(0);
+
+        clientSocket.disconnect();
+        sio.close();
+        done();
+      });
+    });
+
+    it("should not join rooms after disconnection", (done) => {
+      const srv = http().listen(0);
+      const sio = io(srv);
+      const clientSocket = client(srv, "/");
+
+      sio.on("connection", (socket) => {
+        socket.disconnect();
+        socket.join("room1");
+      });
+
+      clientSocket.on("disconnect", () => {
+        expect(sio.of("/").adapter.rooms).to.eql(0);
+
+        sio.close();
+        done();
+      });
+    });
+
     it('should always trigger the callback (if provided) when joining a room', function(done){
       var srv = http();
       var sio = io(srv);
@@ -1899,7 +2016,7 @@ describe('socket.io', function(){
         });
 
         function emit(){
-          sio.emit('bin', new Buffer(10));
+          sio.emit('bin', Buffer.alloc(10));
         }
       });
     });
@@ -2083,8 +2200,8 @@ describe('socket.io', function(){
             socket.join(room, fn);
           });
           socket.on('broadcast', function(){
-            socket.broadcast.to('test').emit('bin', new Buffer(5));
-            socket.emit('bin2', new Buffer(5));
+            socket.broadcast.to('test').emit('bin', Buffer.alloc(5));
+            socket.emit('bin2', Buffer.alloc(5));
           });
         });
       });
@@ -2362,6 +2479,25 @@ describe('socket.io', function(){
         if (++count === 2) done();
       });
     });
+
+    it("should only set `connected` to true after the middleware execution", (done) => {
+      const httpServer = http();
+      const sio = io(httpServer);
+
+      const clientSocket = client(httpServer, "/");
+
+      sio.use((socket, next) => {
+        expect(socket.connected).to.be(false);
+        expect(socket.disconnected).to.be(true);
+        next();
+      });
+
+      sio.on("connection", (socket) => {
+        expect(socket.connected).to.be(true);
+        expect(socket.disconnected).to.be(false);
+        done();
+      });
+    });
   });
 
   describe('socket middleware', function(done){