diff --git a/lib/socket.ts b/lib/socket.ts
index 33619cd4..c3a81619 100644
--- a/lib/socket.ts
+++ b/lib/socket.ts
@@ -4,6 +4,7 @@ import { IncomingMessage } from "http";
 import { Transport } from "./transport";
 import { Server } from "./server";
 import { setTimeout, clearTimeout } from "timers";
+import { Packet, PacketType, RawData } from "engine.io-parser";
 
 const debug = debugModule("engine:socket");
 
@@ -18,7 +19,7 @@ export class Socket extends EventEmitter {
   private server: Server;
   private upgrading: boolean;
   private upgraded: boolean;
-  private writeBuffer: any[];
+  private writeBuffer: Packet[];
   private packetsFn: any[];
   private sentCallbackFn: any[];
   private cleanupFn: any[];
@@ -116,7 +117,7 @@ export class Socket extends EventEmitter {
    * @param {Object} packet
    * @api private
    */
-  private onPacket(packet) {
+  private onPacket(packet: Packet) {
     if ("open" !== this.readyState) {
       return debug("packet received with closed socket");
     }
@@ -417,7 +418,7 @@ export class Socket extends EventEmitter {
   /**
    * Sends a message packet.
    *
-   * @param {String} message
+   * @param {Object} data
    * @param {Object} options
    * @param {Function} callback
    * @return {Socket} for chaining
@@ -436,12 +437,14 @@ export class Socket extends EventEmitter {
   /**
    * Sends a packet.
    *
-   * @param {String} packet type
-   * @param {String} optional, data
+   * @param {String} type - packet type
+   * @param {String} data
    * @param {Object} options
+   * @param {Function} callback
+   *
    * @api private
    */
-  private sendPacket(type, data?, options?, callback?) {
+  private sendPacket(type: PacketType, data?: RawData, options?, callback?) {
     if ("function" === typeof options) {
       callback = options;
       options = null;
@@ -453,10 +456,11 @@ export class Socket extends EventEmitter {
     if ("closing" !== this.readyState && "closed" !== this.readyState) {
       debug('sending packet "%s" (%s)', type, data);
 
-      const packet: any = {
-        type: type,
-        options: options
+      const packet: Packet = {
+        type,
+        options
       };
+
       if (data) packet.data = data;
 
       // exports packetCreate event
diff --git a/lib/transport.ts b/lib/transport.ts
index 53d8ad02..70bc9cfa 100644
--- a/lib/transport.ts
+++ b/lib/transport.ts
@@ -3,6 +3,7 @@ import * as parser_v4 from "engine.io-parser";
 import * as parser_v3 from "./parser-v3/index";
 import debugModule from "debug";
 import { IncomingMessage } from "http";
+import { Packet } from "engine.io-parser";
 
 const debug = debugModule("engine:transport");
 
@@ -111,7 +112,7 @@ export abstract class Transport extends EventEmitter {
    * @param {Object} packet
    * @api protected
    */
-  protected onPacket(packet) {
+  protected onPacket(packet: Packet) {
     this.emit("packet", packet);
   }
 
diff --git a/package-lock.json b/package-lock.json
index dedb2538..be7d844b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -150,6 +150,14 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "node_modules/@socket.io/base64-arraybuffer": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@socket.io/base64-arraybuffer/-/base64-arraybuffer-1.0.2.tgz",
+      "integrity": "sha512-dOlCBKnDw4iShaIsH/bxujKTM18+2TOAsYz+KSc11Am38H4q5Xw8Bbz97ZYdrVNM+um3p7w86Bvvmcn9q+5+eQ==",
+      "engines": {
+        "node": ">= 0.6.0"
+      }
+    },
     "node_modules/@socket.io/component-emitter": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@socket.io/component-emitter/-/component-emitter-3.0.0.tgz",
@@ -645,24 +653,16 @@
       }
     },
     "node_modules/engine.io-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.0.tgz",
-      "integrity": "sha512-wn6QavHEqXoM+cg+x8uUG7GhxLBCfKEKNEsCNc7V2ugj3gB3lK91l1MuZiy6xFB2V9D1eew0aWkmpiT/aBb/KA==",
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.3.tgz",
+      "integrity": "sha512-BtQxwF27XUNnSafQLvDi0dQ8s3i6VgzSoQMJacpIcGNrlUdfHSKbgm3jmjCVvQluGzqwujQMPAoMai3oYSTurg==",
       "dependencies": {
-        "base64-arraybuffer": "~1.0.1"
+        "@socket.io/base64-arraybuffer": "~1.0.2"
       },
       "engines": {
         "node": ">=10.0.0"
       }
     },
-    "node_modules/engine.io-parser/node_modules/base64-arraybuffer": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-1.0.1.tgz",
-      "integrity": "sha512-vFIUq7FdLtjZMhATwDul5RZWv2jpXQ09Pd6jcVEOvIsqCWTRFD/ONHNfyOS8dA/Ippi5dsIgpyKWKZaAKZltbA==",
-      "engines": {
-        "node": ">= 0.6.0"
-      }
-    },
     "node_modules/escalade": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
@@ -2058,6 +2058,11 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@socket.io/base64-arraybuffer": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@socket.io/base64-arraybuffer/-/base64-arraybuffer-1.0.2.tgz",
+      "integrity": "sha512-dOlCBKnDw4iShaIsH/bxujKTM18+2TOAsYz+KSc11Am38H4q5Xw8Bbz97ZYdrVNM+um3p7w86Bvvmcn9q+5+eQ=="
+    },
     "@socket.io/component-emitter": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@socket.io/component-emitter/-/component-emitter-3.0.0.tgz",
@@ -2453,18 +2458,11 @@
       }
     },
     "engine.io-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.0.tgz",
-      "integrity": "sha512-wn6QavHEqXoM+cg+x8uUG7GhxLBCfKEKNEsCNc7V2ugj3gB3lK91l1MuZiy6xFB2V9D1eew0aWkmpiT/aBb/KA==",
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.3.tgz",
+      "integrity": "sha512-BtQxwF27XUNnSafQLvDi0dQ8s3i6VgzSoQMJacpIcGNrlUdfHSKbgm3jmjCVvQluGzqwujQMPAoMai3oYSTurg==",
       "requires": {
-        "base64-arraybuffer": "~1.0.1"
-      },
-      "dependencies": {
-        "base64-arraybuffer": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-1.0.1.tgz",
-          "integrity": "sha512-vFIUq7FdLtjZMhATwDul5RZWv2jpXQ09Pd6jcVEOvIsqCWTRFD/ONHNfyOS8dA/Ippi5dsIgpyKWKZaAKZltbA=="
-        }
+        "@socket.io/base64-arraybuffer": "~1.0.2"
       }
     },
     "escalade": {
@@ -3270,7 +3268,7 @@
     "uWebSockets.js": {
       "version": "git+https://git@github.com/uNetworking/uWebSockets.js.git#4558ee00f9f1f686fffe1accbfc2e85b1af9c50f",
       "dev": true,
-      "from": "uWebSockets.js@uNetworking/uWebSockets.js#v20.0.0"
+      "from": "uWebSockets.js@github:uNetworking/uWebSockets.js#v20.0.0"
     },
     "vary": {
       "version": "1.1.2",