diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb05b02..f2363d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## [4.0.3](https://github.com/socketio/engine.io-parser/compare/4.0.2...4.0.3) (2021-08-29)
+
+
+### Bug Fixes
+
+* respect the offset and length of TypedArray objects ([6d7dd76](https://github.com/socketio/engine.io-parser/commit/6d7dd76130690afda6c214d5c04305d2bbc4eb4d))
+
+
 ## [4.0.2](https://github.com/socketio/engine.io-parser/compare/4.0.1...4.0.2) (2020-12-07)
 
 
diff --git a/lib/encodePacket.browser.js b/lib/encodePacket.browser.js
index b2287af..48023d7 100644
--- a/lib/encodePacket.browser.js
+++ b/lib/encodePacket.browser.js
@@ -25,7 +25,7 @@ const encodePacket = ({ type, data }, supportsBinary, callback) => {
     (data instanceof ArrayBuffer || isView(data))
   ) {
     if (supportsBinary) {
-      return callback(data instanceof ArrayBuffer ? data : data.buffer);
+      return callback(data);
     } else {
       return encodeBlobAsBase64(new Blob([data]), callback);
     }
diff --git a/package-lock.json b/package-lock.json
index f00e04c..90068cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "engine.io-parser",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2045,15 +2045,36 @@
       }
     },
     "browserslist": {
-      "version": "4.12.0",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.12.0.tgz",
-      "integrity": "sha512-UH2GkcEDSI0k/lRkuDSzFl9ZZ87skSy9w2XAn1MsZnL+4c4rqbBd3e82UWHbYDpztABrPBhZsTEeuxVfHppqDg==",
+      "version": "4.16.6",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.16.6.tgz",
+      "integrity": "sha512-Wspk/PqO+4W9qp5iUTJsa1B/QrYn1keNCcEP5OvP7WBwT4KaDly0uONYmC6Xa3Z5IqnUgS0KcgLYu1l74x0ZXQ==",
       "dev": true,
       "requires": {
-        "caniuse-lite": "^1.0.30001043",
-        "electron-to-chromium": "^1.3.413",
-        "node-releases": "^1.1.53",
-        "pkg-up": "^2.0.0"
+        "caniuse-lite": "^1.0.30001219",
+        "colorette": "^1.2.2",
+        "electron-to-chromium": "^1.3.723",
+        "escalade": "^3.1.1",
+        "node-releases": "^1.1.71"
+      },
+      "dependencies": {
+        "caniuse-lite": {
+          "version": "1.0.30001230",
+          "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001230.tgz",
+          "integrity": "sha512-5yBd5nWCBS+jWKTcHOzXwo5xzcj4ePE/yjtkZyUV1BTUmrBaA9MRGC+e7mxnqXSA90CmCA8L3eKLaSUkt099IQ==",
+          "dev": true
+        },
+        "electron-to-chromium": {
+          "version": "1.3.739",
+          "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.739.tgz",
+          "integrity": "sha512-+LPJVRsN7hGZ9EIUUiWCpO7l4E3qBYHNadazlucBfsXBbccDFNKUBAgzE68FnkWGJPwD/AfKhSzL+G+Iqb8A4A==",
+          "dev": true
+        },
+        "node-releases": {
+          "version": "1.1.72",
+          "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.72.tgz",
+          "integrity": "sha512-LLUo+PpH3dU6XizX3iVoubUNheF/owjXCZZ5yACDxNnPtgFuludV1ZL3ayK1kVep42Rmm0+R9/Y60NQbZ2bifw==",
+          "dev": true
+        }
       }
     },
     "buffer": {
@@ -2166,12 +2187,6 @@
       "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
       "dev": true
     },
-    "caniuse-lite": {
-      "version": "1.0.30001062",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001062.tgz",
-      "integrity": "sha512-ei9ZqeOnN7edDrb24QfJ0OZicpEbsWxv7WusOiQGz/f2SfvBgHHbOEwBJ8HKGVSyx8Z6ndPjxzR6m0NQq+0bfw==",
-      "dev": true
-    },
     "caseless": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.6.0.tgz",
@@ -2371,6 +2386,12 @@
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
+    "colorette": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-1.2.2.tgz",
+      "integrity": "sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==",
+      "dev": true
+    },
     "colors": {
       "version": "0.6.2",
       "resolved": "https://registry.npmjs.org/colors/-/colors-0.6.2.tgz",
@@ -3047,25 +3068,27 @@
       "integrity": "sha1-ag18YiHkkP7v2S7D9EHJzozQl/Q=",
       "dev": true
     },
-    "electron-to-chromium": {
-      "version": "1.3.443",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.443.tgz",
-      "integrity": "sha512-ty0LEroTap/xfMy31oQ3XX+Q377QvWvJaha2cmuXcbmBiX2EIB5SNDQ0hp8lhvxj63WG0zOgm/4MQ/oUBdfQqg==",
-      "dev": true
-    },
     "elliptic": {
-      "version": "6.5.3",
-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
-      "integrity": "sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==",
+      "version": "6.5.4",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
       "dev": true,
       "requires": {
-        "bn.js": "^4.4.0",
-        "brorand": "^1.0.1",
+        "bn.js": "^4.11.9",
+        "brorand": "^1.1.0",
         "hash.js": "^1.0.0",
-        "hmac-drbg": "^1.0.0",
-        "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0",
-        "minimalistic-crypto-utils": "^1.0.0"
+        "hmac-drbg": "^1.0.1",
+        "inherits": "^2.0.4",
+        "minimalistic-assert": "^1.0.1",
+        "minimalistic-crypto-utils": "^1.0.1"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+          "dev": true
+        }
       }
     },
     "emitter-component": {
@@ -3101,6 +3124,12 @@
       "integrity": "sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==",
       "dev": true
     },
+    "escalade": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
+      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==",
+      "dev": true
+    },
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -3711,15 +3740,6 @@
       "integrity": "sha1-v1OdfQ8CmWYx+iGWaA9ndnYrn3A=",
       "dev": true
     },
-    "find-up": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
-      "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
-      "dev": true,
-      "requires": {
-        "locate-path": "^2.0.0"
-      }
-    },
     "findup-sync": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/findup-sync/-/findup-sync-0.1.3.tgz",
@@ -6280,16 +6300,6 @@
         }
       }
     },
-    "locate-path": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-2.0.0.tgz",
-      "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
-      "dev": true,
-      "requires": {
-        "p-locate": "^2.0.0",
-        "path-exists": "^3.0.0"
-      }
-    },
     "lock": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/lock/-/lock-0.1.4.tgz",
@@ -6978,12 +6988,6 @@
         "process-on-spawn": "^1.0.0"
       }
     },
-    "node-releases": {
-      "version": "1.1.55",
-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.55.tgz",
-      "integrity": "sha512-H3R3YR/8TjT5WPin/wOoHOUPHgvj8leuU/Keta/rwelEQN9pA/S2Dx8/se4pZ2LBxSd0nAGzsNzhqwa77v7F1w==",
-      "dev": true
-    },
     "nopt": {
       "version": "3.0.6",
       "resolved": "https://registry.npmjs.org/nopt/-/nopt-3.0.6.tgz",
@@ -7289,24 +7293,6 @@
         }
       }
     },
-    "p-limit": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.3.0.tgz",
-      "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
-      "dev": true,
-      "requires": {
-        "p-try": "^1.0.0"
-      }
-    },
-    "p-locate": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
-      "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
-      "dev": true,
-      "requires": {
-        "p-limit": "^1.1.0"
-      }
-    },
     "p-map": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/p-map/-/p-map-3.0.0.tgz",
@@ -7316,12 +7302,6 @@
         "aggregate-error": "^3.0.0"
       }
     },
-    "p-try": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
-      "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=",
-      "dev": true
-    },
     "package-hash": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/package-hash/-/package-hash-4.0.0.tgz",
@@ -7419,12 +7399,6 @@
       "integrity": "sha512-BapA40NHICOS+USX9SN4tyhq+A2RrN/Ws5F0Z5aMHDp98Fl86lX8Oti8B7uN93L4Ifv4fHOEA+pQw87gmMO/lQ==",
       "dev": true
     },
-    "path-exists": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
-      "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
-      "dev": true
-    },
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -7438,9 +7412,9 @@
       "dev": true
     },
     "path-parse": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
-      "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
+      "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==",
       "dev": true
     },
     "path-platform": {
@@ -7540,15 +7514,6 @@
         }
       }
     },
-    "pkg-up": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/pkg-up/-/pkg-up-2.0.0.tgz",
-      "integrity": "sha1-yBmscoBZpGHKscOImivjxJoATX8=",
-      "dev": true,
-      "requires": {
-        "find-up": "^2.1.0"
-      }
-    },
     "platform": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/platform/-/platform-1.3.5.tgz",
@@ -10107,9 +10072,9 @@
       }
     },
     "y18n": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
       "dev": true
     },
     "yamljs": {
diff --git a/package.json b/package.json
index daf79dc..2bc4d08 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-parser",
   "description": "Parser for the client for the realtime Engine",
   "license": "MIT",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "main": "lib/index.js",
   "homepage": "https://github.com/socketio/engine.io-parser",
   "devDependencies": {
diff --git a/test/browser.js b/test/browser.js
index e94a499..a1ba23d 100644
--- a/test/browser.js
+++ b/test/browser.js
@@ -60,12 +60,11 @@ describe("engine.io-parser (browser only)", () => {
         });
       });
 
-      it("should encode a typed array (with offset and length)", done => {
+      it.only("should encode a typed array (with offset and length)", done => {
         const buffer = createArrayBuffer([1, 2, 3, 4]);
         const data = new Int8Array(buffer, 1, 2);
         encodePacket({ type: "message", data }, true, encodedPacket => {
-          expect(encodedPacket).to.be.an(ArrayBuffer);
-          expect(encodedPacket).to.eql(createArrayBuffer([2, 4]));
+          expect(encodedPacket).to.eql(data); // unmodified typed array
           done();
         });
       });