diff --git a/CHANGELOG.md b/CHANGELOG.md
index db4510f19..d9ef7f70e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## [4.0.6](https://github.com/socketio/engine.io-client/compare/4.0.5...4.0.6) (2021-01-04)
+
+
 # [3.5.0](https://github.com/socketio/engine.io-client/compare/3.4.4...3.5.0) (2020-12-30)
 
 
diff --git a/dist/engine.io.js b/dist/engine.io.js
index 69e785561..9ffab8710 100644
--- a/dist/engine.io.js
+++ b/dist/engine.io.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v4.0.5
- * (c) 2014-2020 Guillermo Rauch
+ * Engine.IO v4.0.6
+ * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
 (function webpackUniversalModuleDefinition(root, factory) {
@@ -272,7 +272,7 @@ eval("/**\r\n * Expose `Emitter`.\r\n */\nif (true) {\n  module.exports = Emitte
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-eval("/* WEBPACK VAR INJECTION */(function(process) {function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\n/* eslint-env browser */\n\n/**\n * This is the web browser implementation of `debug()`.\n */\nexports.log = log;\nexports.formatArgs = formatArgs;\nexports.save = save;\nexports.load = load;\nexports.useColors = useColors;\nexports.storage = localstorage();\n/**\n * Colors.\n */\n\nexports.colors = ['#0000CC', '#0000FF', '#0033CC', '#0033FF', '#0066CC', '#0066FF', '#0099CC', '#0099FF', '#00CC00', '#00CC33', '#00CC66', '#00CC99', '#00CCCC', '#00CCFF', '#3300CC', '#3300FF', '#3333CC', '#3333FF', '#3366CC', '#3366FF', '#3399CC', '#3399FF', '#33CC00', '#33CC33', '#33CC66', '#33CC99', '#33CCCC', '#33CCFF', '#6600CC', '#6600FF', '#6633CC', '#6633FF', '#66CC00', '#66CC33', '#9900CC', '#9900FF', '#9933CC', '#9933FF', '#99CC00', '#99CC33', '#CC0000', '#CC0033', '#CC0066', '#CC0099', '#CC00CC', '#CC00FF', '#CC3300', '#CC3333', '#CC3366', '#CC3399', '#CC33CC', '#CC33FF', '#CC6600', '#CC6633', '#CC9900', '#CC9933', '#CCCC00', '#CCCC33', '#FF0000', '#FF0033', '#FF0066', '#FF0099', '#FF00CC', '#FF00FF', '#FF3300', '#FF3333', '#FF3366', '#FF3399', '#FF33CC', '#FF33FF', '#FF6600', '#FF6633', '#FF9900', '#FF9933', '#FFCC00', '#FFCC33'];\n/**\n * Currently only WebKit-based Web Inspectors, Firefox >= v31,\n * and the Firebug extension (any Firefox version) are known\n * to support \"%c\" CSS customizations.\n *\n * TODO: add a `localStorage` variable to explicitly enable/disable colors\n */\n// eslint-disable-next-line complexity\n\nfunction useColors() {\n  // NB: In an Electron preload script, document will be defined but not fully\n  // initialized. Since we know we're in Chrome, we'll just detect this case\n  // explicitly\n  if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {\n    return true;\n  } // Internet Explorer and Edge do not support colors.\n\n\n  if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\\/(\\d+)/)) {\n    return false;\n  } // Is webkit? http://stackoverflow.com/a/16459606/376773\n  // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632\n\n\n  return typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance || // Is firebug? http://stackoverflow.com/a/398120/376773\n  typeof window !== 'undefined' && window.console && (window.console.firebug || window.console.exception && window.console.table) || // Is firefox >= v31?\n  // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages\n  typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\\/(\\d+)/) && parseInt(RegExp.$1, 10) >= 31 || // Double check webkit in userAgent just in case we are in a worker\n  typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\\/(\\d+)/);\n}\n/**\n * Colorize log arguments if enabled.\n *\n * @api public\n */\n\n\nfunction formatArgs(args) {\n  args[0] = (this.useColors ? '%c' : '') + this.namespace + (this.useColors ? ' %c' : ' ') + args[0] + (this.useColors ? '%c ' : ' ') + '+' + module.exports.humanize(this.diff);\n\n  if (!this.useColors) {\n    return;\n  }\n\n  var c = 'color: ' + this.color;\n  args.splice(1, 0, c, 'color: inherit'); // The final \"%c\" is somewhat tricky, because there could be other\n  // arguments passed either before or after the %c, so we need to\n  // figure out the correct index to insert the CSS into\n\n  var index = 0;\n  var lastC = 0;\n  args[0].replace(/%[a-zA-Z%]/g, function (match) {\n    if (match === '%%') {\n      return;\n    }\n\n    index++;\n\n    if (match === '%c') {\n      // We only are interested in the *last* %c\n      // (the user may have provided their own)\n      lastC = index;\n    }\n  });\n  args.splice(lastC, 0, c);\n}\n/**\n * Invokes `console.log()` when available.\n * No-op when `console.log` is not a \"function\".\n *\n * @api public\n */\n\n\nfunction log() {\n  var _console;\n\n  // This hackery is required for IE8/9, where\n  // the `console.log` function doesn't have 'apply'\n  return (typeof console === \"undefined\" ? \"undefined\" : _typeof(console)) === 'object' && console.log && (_console = console).log.apply(_console, arguments);\n}\n/**\n * Save `namespaces`.\n *\n * @param {String} namespaces\n * @api private\n */\n\n\nfunction save(namespaces) {\n  try {\n    if (namespaces) {\n      exports.storage.setItem('debug', namespaces);\n    } else {\n      exports.storage.removeItem('debug');\n    }\n  } catch (error) {// Swallow\n    // XXX (@Qix-) should we be logging these?\n  }\n}\n/**\n * Load `namespaces`.\n *\n * @return {String} returns the previously persisted debug modes\n * @api private\n */\n\n\nfunction load() {\n  var r;\n\n  try {\n    r = exports.storage.getItem('debug');\n  } catch (error) {// Swallow\n    // XXX (@Qix-) should we be logging these?\n  } // If debug isn't set in LS, and we're in Electron, try to load $DEBUG\n\n\n  if (!r && typeof process !== 'undefined' && 'env' in process) {\n    r = process.env.DEBUG;\n  }\n\n  return r;\n}\n/**\n * Localstorage attempts to return the localstorage.\n *\n * This is necessary because safari throws\n * when a user disables cookies/localstorage\n * and you attempt to access it.\n *\n * @return {LocalStorage}\n * @api private\n */\n\n\nfunction localstorage() {\n  try {\n    // TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context\n    // The Browser also has localStorage in the global context.\n    return localStorage;\n  } catch (error) {// Swallow\n    // XXX (@Qix-) should we be logging these?\n  }\n}\n\nmodule.exports = __webpack_require__(/*! ./common */ \"./node_modules/debug/src/common.js\")(exports);\nvar formatters = module.exports.formatters;\n/**\n * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.\n */\n\nformatters.j = function (v) {\n  try {\n    return JSON.stringify(v);\n  } catch (error) {\n    return '[UnexpectedJSONParseError]: ' + error.message;\n  }\n};\n/* WEBPACK VAR INJECTION */}.call(this, __webpack_require__(/*! ./../../process/browser.js */ \"./node_modules/process/browser.js\")))\n\n//# sourceURL=webpack://eio/./node_modules/debug/src/browser.js?");
+eval("/* WEBPACK VAR INJECTION */(function(process) {/* eslint-env browser */\n\n/**\n * This is the web browser implementation of `debug()`.\n */\nexports.formatArgs = formatArgs;\nexports.save = save;\nexports.load = load;\nexports.useColors = useColors;\nexports.storage = localstorage();\n\nexports.destroy = function () {\n  var warned = false;\n  return function () {\n    if (!warned) {\n      warned = true;\n      console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');\n    }\n  };\n}();\n/**\n * Colors.\n */\n\n\nexports.colors = ['#0000CC', '#0000FF', '#0033CC', '#0033FF', '#0066CC', '#0066FF', '#0099CC', '#0099FF', '#00CC00', '#00CC33', '#00CC66', '#00CC99', '#00CCCC', '#00CCFF', '#3300CC', '#3300FF', '#3333CC', '#3333FF', '#3366CC', '#3366FF', '#3399CC', '#3399FF', '#33CC00', '#33CC33', '#33CC66', '#33CC99', '#33CCCC', '#33CCFF', '#6600CC', '#6600FF', '#6633CC', '#6633FF', '#66CC00', '#66CC33', '#9900CC', '#9900FF', '#9933CC', '#9933FF', '#99CC00', '#99CC33', '#CC0000', '#CC0033', '#CC0066', '#CC0099', '#CC00CC', '#CC00FF', '#CC3300', '#CC3333', '#CC3366', '#CC3399', '#CC33CC', '#CC33FF', '#CC6600', '#CC6633', '#CC9900', '#CC9933', '#CCCC00', '#CCCC33', '#FF0000', '#FF0033', '#FF0066', '#FF0099', '#FF00CC', '#FF00FF', '#FF3300', '#FF3333', '#FF3366', '#FF3399', '#FF33CC', '#FF33FF', '#FF6600', '#FF6633', '#FF9900', '#FF9933', '#FFCC00', '#FFCC33'];\n/**\n * Currently only WebKit-based Web Inspectors, Firefox >= v31,\n * and the Firebug extension (any Firefox version) are known\n * to support \"%c\" CSS customizations.\n *\n * TODO: add a `localStorage` variable to explicitly enable/disable colors\n */\n// eslint-disable-next-line complexity\n\nfunction useColors() {\n  // NB: In an Electron preload script, document will be defined but not fully\n  // initialized. Since we know we're in Chrome, we'll just detect this case\n  // explicitly\n  if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {\n    return true;\n  } // Internet Explorer and Edge do not support colors.\n\n\n  if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\\/(\\d+)/)) {\n    return false;\n  } // Is webkit? http://stackoverflow.com/a/16459606/376773\n  // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632\n\n\n  return typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance || // Is firebug? http://stackoverflow.com/a/398120/376773\n  typeof window !== 'undefined' && window.console && (window.console.firebug || window.console.exception && window.console.table) || // Is firefox >= v31?\n  // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages\n  typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\\/(\\d+)/) && parseInt(RegExp.$1, 10) >= 31 || // Double check webkit in userAgent just in case we are in a worker\n  typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\\/(\\d+)/);\n}\n/**\n * Colorize log arguments if enabled.\n *\n * @api public\n */\n\n\nfunction formatArgs(args) {\n  args[0] = (this.useColors ? '%c' : '') + this.namespace + (this.useColors ? ' %c' : ' ') + args[0] + (this.useColors ? '%c ' : ' ') + '+' + module.exports.humanize(this.diff);\n\n  if (!this.useColors) {\n    return;\n  }\n\n  var c = 'color: ' + this.color;\n  args.splice(1, 0, c, 'color: inherit'); // The final \"%c\" is somewhat tricky, because there could be other\n  // arguments passed either before or after the %c, so we need to\n  // figure out the correct index to insert the CSS into\n\n  var index = 0;\n  var lastC = 0;\n  args[0].replace(/%[a-zA-Z%]/g, function (match) {\n    if (match === '%%') {\n      return;\n    }\n\n    index++;\n\n    if (match === '%c') {\n      // We only are interested in the *last* %c\n      // (the user may have provided their own)\n      lastC = index;\n    }\n  });\n  args.splice(lastC, 0, c);\n}\n/**\n * Invokes `console.debug()` when available.\n * No-op when `console.debug` is not a \"function\".\n * If `console.debug` is not available, falls back\n * to `console.log`.\n *\n * @api public\n */\n\n\nexports.log = console.debug || console.log || function () {};\n/**\n * Save `namespaces`.\n *\n * @param {String} namespaces\n * @api private\n */\n\n\nfunction save(namespaces) {\n  try {\n    if (namespaces) {\n      exports.storage.setItem('debug', namespaces);\n    } else {\n      exports.storage.removeItem('debug');\n    }\n  } catch (error) {// Swallow\n    // XXX (@Qix-) should we be logging these?\n  }\n}\n/**\n * Load `namespaces`.\n *\n * @return {String} returns the previously persisted debug modes\n * @api private\n */\n\n\nfunction load() {\n  var r;\n\n  try {\n    r = exports.storage.getItem('debug');\n  } catch (error) {// Swallow\n    // XXX (@Qix-) should we be logging these?\n  } // If debug isn't set in LS, and we're in Electron, try to load $DEBUG\n\n\n  if (!r && typeof process !== 'undefined' && 'env' in process) {\n    r = process.env.DEBUG;\n  }\n\n  return r;\n}\n/**\n * Localstorage attempts to return the localstorage.\n *\n * This is necessary because safari throws\n * when a user disables cookies/localstorage\n * and you attempt to access it.\n *\n * @return {LocalStorage}\n * @api private\n */\n\n\nfunction localstorage() {\n  try {\n    // TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context\n    // The Browser also has localStorage in the global context.\n    return localStorage;\n  } catch (error) {// Swallow\n    // XXX (@Qix-) should we be logging these?\n  }\n}\n\nmodule.exports = __webpack_require__(/*! ./common */ \"./node_modules/debug/src/common.js\")(exports);\nvar formatters = module.exports.formatters;\n/**\n * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.\n */\n\nformatters.j = function (v) {\n  try {\n    return JSON.stringify(v);\n  } catch (error) {\n    return '[UnexpectedJSONParseError]: ' + error.message;\n  }\n};\n/* WEBPACK VAR INJECTION */}.call(this, __webpack_require__(/*! ./../../process/browser.js */ \"./node_modules/process/browser.js\")))\n\n//# sourceURL=webpack://eio/./node_modules/debug/src/browser.js?");
 
 /***/ }),
 
@@ -283,7 +283,7 @@ eval("/* WEBPACK VAR INJECTION */(function(process) {function _typeof(obj) { \"@
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-eval("function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\"); }\n\nfunction _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === \"string\") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === \"Object\" && o.constructor) n = o.constructor.name; if (n === \"Map\" || n === \"Set\") return Array.from(o); if (n === \"Arguments\" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }\n\nfunction _iterableToArray(iter) { if (typeof Symbol !== \"undefined\" && Symbol.iterator in Object(iter)) return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }\n\nfunction _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }\n\n/**\n * This is the common logic for both the Node.js and web browser\n * implementations of `debug()`.\n */\nfunction setup(env) {\n  createDebug.debug = createDebug;\n  createDebug[\"default\"] = createDebug;\n  createDebug.coerce = coerce;\n  createDebug.disable = disable;\n  createDebug.enable = enable;\n  createDebug.enabled = enabled;\n  createDebug.humanize = __webpack_require__(/*! ms */ \"./node_modules/ms/index.js\");\n  Object.keys(env).forEach(function (key) {\n    createDebug[key] = env[key];\n  });\n  /**\n  * Active `debug` instances.\n  */\n\n  createDebug.instances = [];\n  /**\n  * The currently active debug mode names, and names to skip.\n  */\n\n  createDebug.names = [];\n  createDebug.skips = [];\n  /**\n  * Map of special \"%n\" handling functions, for the debug \"format\" argument.\n  *\n  * Valid key names are a single, lower or upper-case letter, i.e. \"n\" and \"N\".\n  */\n\n  createDebug.formatters = {};\n  /**\n  * Selects a color for a debug namespace\n  * @param {String} namespace The namespace string for the for the debug instance to be colored\n  * @return {Number|String} An ANSI color code for the given namespace\n  * @api private\n  */\n\n  function selectColor(namespace) {\n    var hash = 0;\n\n    for (var i = 0; i < namespace.length; i++) {\n      hash = (hash << 5) - hash + namespace.charCodeAt(i);\n      hash |= 0; // Convert to 32bit integer\n    }\n\n    return createDebug.colors[Math.abs(hash) % createDebug.colors.length];\n  }\n\n  createDebug.selectColor = selectColor;\n  /**\n  * Create a debugger with the given `namespace`.\n  *\n  * @param {String} namespace\n  * @return {Function}\n  * @api public\n  */\n\n  function createDebug(namespace) {\n    var prevTime;\n\n    function debug() {\n      for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n        args[_key] = arguments[_key];\n      }\n\n      // Disabled?\n      if (!debug.enabled) {\n        return;\n      }\n\n      var self = debug; // Set `diff` timestamp\n\n      var curr = Number(new Date());\n      var ms = curr - (prevTime || curr);\n      self.diff = ms;\n      self.prev = prevTime;\n      self.curr = curr;\n      prevTime = curr;\n      args[0] = createDebug.coerce(args[0]);\n\n      if (typeof args[0] !== 'string') {\n        // Anything else let's inspect with %O\n        args.unshift('%O');\n      } // Apply any `formatters` transformations\n\n\n      var index = 0;\n      args[0] = args[0].replace(/%([a-zA-Z%])/g, function (match, format) {\n        // If we encounter an escaped % then don't increase the array index\n        if (match === '%%') {\n          return match;\n        }\n\n        index++;\n        var formatter = createDebug.formatters[format];\n\n        if (typeof formatter === 'function') {\n          var val = args[index];\n          match = formatter.call(self, val); // Now we need to remove `args[index]` since it's inlined in the `format`\n\n          args.splice(index, 1);\n          index--;\n        }\n\n        return match;\n      }); // Apply env-specific formatting (colors, etc.)\n\n      createDebug.formatArgs.call(self, args);\n      var logFn = self.log || createDebug.log;\n      logFn.apply(self, args);\n    }\n\n    debug.namespace = namespace;\n    debug.enabled = createDebug.enabled(namespace);\n    debug.useColors = createDebug.useColors();\n    debug.color = selectColor(namespace);\n    debug.destroy = destroy;\n    debug.extend = extend; // Debug.formatArgs = formatArgs;\n    // debug.rawLog = rawLog;\n    // env-specific initialization logic for debug instances\n\n    if (typeof createDebug.init === 'function') {\n      createDebug.init(debug);\n    }\n\n    createDebug.instances.push(debug);\n    return debug;\n  }\n\n  function destroy() {\n    var index = createDebug.instances.indexOf(this);\n\n    if (index !== -1) {\n      createDebug.instances.splice(index, 1);\n      return true;\n    }\n\n    return false;\n  }\n\n  function extend(namespace, delimiter) {\n    var newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);\n    newDebug.log = this.log;\n    return newDebug;\n  }\n  /**\n  * Enables a debug mode by namespaces. This can include modes\n  * separated by a colon and wildcards.\n  *\n  * @param {String} namespaces\n  * @api public\n  */\n\n\n  function enable(namespaces) {\n    createDebug.save(namespaces);\n    createDebug.names = [];\n    createDebug.skips = [];\n    var i;\n    var split = (typeof namespaces === 'string' ? namespaces : '').split(/[\\s,]+/);\n    var len = split.length;\n\n    for (i = 0; i < len; i++) {\n      if (!split[i]) {\n        // ignore empty strings\n        continue;\n      }\n\n      namespaces = split[i].replace(/\\*/g, '.*?');\n\n      if (namespaces[0] === '-') {\n        createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));\n      } else {\n        createDebug.names.push(new RegExp('^' + namespaces + '$'));\n      }\n    }\n\n    for (i = 0; i < createDebug.instances.length; i++) {\n      var instance = createDebug.instances[i];\n      instance.enabled = createDebug.enabled(instance.namespace);\n    }\n  }\n  /**\n  * Disable debug output.\n  *\n  * @return {String} namespaces\n  * @api public\n  */\n\n\n  function disable() {\n    var namespaces = [].concat(_toConsumableArray(createDebug.names.map(toNamespace)), _toConsumableArray(createDebug.skips.map(toNamespace).map(function (namespace) {\n      return '-' + namespace;\n    }))).join(',');\n    createDebug.enable('');\n    return namespaces;\n  }\n  /**\n  * Returns true if the given mode name is enabled, false otherwise.\n  *\n  * @param {String} name\n  * @return {Boolean}\n  * @api public\n  */\n\n\n  function enabled(name) {\n    if (name[name.length - 1] === '*') {\n      return true;\n    }\n\n    var i;\n    var len;\n\n    for (i = 0, len = createDebug.skips.length; i < len; i++) {\n      if (createDebug.skips[i].test(name)) {\n        return false;\n      }\n    }\n\n    for (i = 0, len = createDebug.names.length; i < len; i++) {\n      if (createDebug.names[i].test(name)) {\n        return true;\n      }\n    }\n\n    return false;\n  }\n  /**\n  * Convert regexp to namespace\n  *\n  * @param {RegExp} regxep\n  * @return {String} namespace\n  * @api private\n  */\n\n\n  function toNamespace(regexp) {\n    return regexp.toString().substring(2, regexp.toString().length - 2).replace(/\\.\\*\\?$/, '*');\n  }\n  /**\n  * Coerce `val`.\n  *\n  * @param {Mixed} val\n  * @return {Mixed}\n  * @api private\n  */\n\n\n  function coerce(val) {\n    if (val instanceof Error) {\n      return val.stack || val.message;\n    }\n\n    return val;\n  }\n\n  createDebug.enable(createDebug.load());\n  return createDebug;\n}\n\nmodule.exports = setup;\n\n//# sourceURL=webpack://eio/./node_modules/debug/src/common.js?");
+eval("function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\"); }\n\nfunction _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === \"string\") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === \"Object\" && o.constructor) n = o.constructor.name; if (n === \"Map\" || n === \"Set\") return Array.from(o); if (n === \"Arguments\" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }\n\nfunction _iterableToArray(iter) { if (typeof Symbol !== \"undefined\" && Symbol.iterator in Object(iter)) return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }\n\nfunction _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }\n\n/**\n * This is the common logic for both the Node.js and web browser\n * implementations of `debug()`.\n */\nfunction setup(env) {\n  createDebug.debug = createDebug;\n  createDebug[\"default\"] = createDebug;\n  createDebug.coerce = coerce;\n  createDebug.disable = disable;\n  createDebug.enable = enable;\n  createDebug.enabled = enabled;\n  createDebug.humanize = __webpack_require__(/*! ms */ \"./node_modules/ms/index.js\");\n  createDebug.destroy = destroy;\n  Object.keys(env).forEach(function (key) {\n    createDebug[key] = env[key];\n  });\n  /**\n  * The currently active debug mode names, and names to skip.\n  */\n\n  createDebug.names = [];\n  createDebug.skips = [];\n  /**\n  * Map of special \"%n\" handling functions, for the debug \"format\" argument.\n  *\n  * Valid key names are a single, lower or upper-case letter, i.e. \"n\" and \"N\".\n  */\n\n  createDebug.formatters = {};\n  /**\n  * Selects a color for a debug namespace\n  * @param {String} namespace The namespace string for the for the debug instance to be colored\n  * @return {Number|String} An ANSI color code for the given namespace\n  * @api private\n  */\n\n  function selectColor(namespace) {\n    var hash = 0;\n\n    for (var i = 0; i < namespace.length; i++) {\n      hash = (hash << 5) - hash + namespace.charCodeAt(i);\n      hash |= 0; // Convert to 32bit integer\n    }\n\n    return createDebug.colors[Math.abs(hash) % createDebug.colors.length];\n  }\n\n  createDebug.selectColor = selectColor;\n  /**\n  * Create a debugger with the given `namespace`.\n  *\n  * @param {String} namespace\n  * @return {Function}\n  * @api public\n  */\n\n  function createDebug(namespace) {\n    var prevTime;\n    var enableOverride = null;\n\n    function debug() {\n      for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n        args[_key] = arguments[_key];\n      }\n\n      // Disabled?\n      if (!debug.enabled) {\n        return;\n      }\n\n      var self = debug; // Set `diff` timestamp\n\n      var curr = Number(new Date());\n      var ms = curr - (prevTime || curr);\n      self.diff = ms;\n      self.prev = prevTime;\n      self.curr = curr;\n      prevTime = curr;\n      args[0] = createDebug.coerce(args[0]);\n\n      if (typeof args[0] !== 'string') {\n        // Anything else let's inspect with %O\n        args.unshift('%O');\n      } // Apply any `formatters` transformations\n\n\n      var index = 0;\n      args[0] = args[0].replace(/%([a-zA-Z%])/g, function (match, format) {\n        // If we encounter an escaped % then don't increase the array index\n        if (match === '%%') {\n          return '%';\n        }\n\n        index++;\n        var formatter = createDebug.formatters[format];\n\n        if (typeof formatter === 'function') {\n          var val = args[index];\n          match = formatter.call(self, val); // Now we need to remove `args[index]` since it's inlined in the `format`\n\n          args.splice(index, 1);\n          index--;\n        }\n\n        return match;\n      }); // Apply env-specific formatting (colors, etc.)\n\n      createDebug.formatArgs.call(self, args);\n      var logFn = self.log || createDebug.log;\n      logFn.apply(self, args);\n    }\n\n    debug.namespace = namespace;\n    debug.useColors = createDebug.useColors();\n    debug.color = createDebug.selectColor(namespace);\n    debug.extend = extend;\n    debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.\n\n    Object.defineProperty(debug, 'enabled', {\n      enumerable: true,\n      configurable: false,\n      get: function get() {\n        return enableOverride === null ? createDebug.enabled(namespace) : enableOverride;\n      },\n      set: function set(v) {\n        enableOverride = v;\n      }\n    }); // Env-specific initialization logic for debug instances\n\n    if (typeof createDebug.init === 'function') {\n      createDebug.init(debug);\n    }\n\n    return debug;\n  }\n\n  function extend(namespace, delimiter) {\n    var newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);\n    newDebug.log = this.log;\n    return newDebug;\n  }\n  /**\n  * Enables a debug mode by namespaces. This can include modes\n  * separated by a colon and wildcards.\n  *\n  * @param {String} namespaces\n  * @api public\n  */\n\n\n  function enable(namespaces) {\n    createDebug.save(namespaces);\n    createDebug.names = [];\n    createDebug.skips = [];\n    var i;\n    var split = (typeof namespaces === 'string' ? namespaces : '').split(/[\\s,]+/);\n    var len = split.length;\n\n    for (i = 0; i < len; i++) {\n      if (!split[i]) {\n        // ignore empty strings\n        continue;\n      }\n\n      namespaces = split[i].replace(/\\*/g, '.*?');\n\n      if (namespaces[0] === '-') {\n        createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));\n      } else {\n        createDebug.names.push(new RegExp('^' + namespaces + '$'));\n      }\n    }\n  }\n  /**\n  * Disable debug output.\n  *\n  * @return {String} namespaces\n  * @api public\n  */\n\n\n  function disable() {\n    var namespaces = [].concat(_toConsumableArray(createDebug.names.map(toNamespace)), _toConsumableArray(createDebug.skips.map(toNamespace).map(function (namespace) {\n      return '-' + namespace;\n    }))).join(',');\n    createDebug.enable('');\n    return namespaces;\n  }\n  /**\n  * Returns true if the given mode name is enabled, false otherwise.\n  *\n  * @param {String} name\n  * @return {Boolean}\n  * @api public\n  */\n\n\n  function enabled(name) {\n    if (name[name.length - 1] === '*') {\n      return true;\n    }\n\n    var i;\n    var len;\n\n    for (i = 0, len = createDebug.skips.length; i < len; i++) {\n      if (createDebug.skips[i].test(name)) {\n        return false;\n      }\n    }\n\n    for (i = 0, len = createDebug.names.length; i < len; i++) {\n      if (createDebug.names[i].test(name)) {\n        return true;\n      }\n    }\n\n    return false;\n  }\n  /**\n  * Convert regexp to namespace\n  *\n  * @param {RegExp} regxep\n  * @return {String} namespace\n  * @api private\n  */\n\n\n  function toNamespace(regexp) {\n    return regexp.toString().substring(2, regexp.toString().length - 2).replace(/\\.\\*\\?$/, '*');\n  }\n  /**\n  * Coerce `val`.\n  *\n  * @param {Mixed} val\n  * @return {Mixed}\n  * @api private\n  */\n\n\n  function coerce(val) {\n    if (val instanceof Error) {\n      return val.stack || val.message;\n    }\n\n    return val;\n  }\n  /**\n  * XXX DO NOT USE. This is a temporary stub function.\n  * XXX It WILL be removed in the next major release.\n  */\n\n\n  function destroy() {\n    console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');\n  }\n\n  createDebug.enable(createDebug.load());\n  return createDebug;\n}\n\nmodule.exports = setup;\n\n//# sourceURL=webpack://eio/./node_modules/debug/src/common.js?");
 
 /***/ }),
 
diff --git a/dist/engine.io.min.js b/dist/engine.io.min.js
index 13089884f..b8983e092 100644
--- a/dist/engine.io.min.js
+++ b/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v4.0.5
- * (c) 2014-2020 Guillermo Rauch
+ * Engine.IO v4.0.6
+ * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
 !function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.eio=e():t.eio=e()}("undefined"!=typeof self?self:"undefined"!=typeof window?window:"undefined"!=typeof global?global:Function("return this")(),(function(){return function(t){var e={};function r(n){if(e[n])return e[n].exports;var o=e[n]={i:n,l:!1,exports:{}};return t[n].call(o.exports,o,o.exports,r),o.l=!0,o.exports}return r.m=t,r.c=e,r.d=function(t,e,n){r.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:n})},r.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},r.t=function(t,e){if(1&e&&(t=r(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in 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diff --git a/package-lock.json b/package-lock.json
index d377f9dc0..775fca6cb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "engine.io-client",
-  "version": "4.0.5",
+  "version": "4.0.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index f0558c24d..fedbe0bc0 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "4.0.5",
+  "version": "4.0.6",
   "main": "lib/index.js",
   "homepage": "https://github.com/socketio/engine.io-client",
   "contributors": [