diff --git a/package.json b/package.json
index 0a8fbb7..9825ae1 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "@types/node-fetch": "^2.5.6",
     "@typescript-eslint/eslint-plugin": "^4.19.0",
     "@typescript-eslint/parser": "^4.19.0",
-    "cbor": "^6.0.1",
+    "cbor": "^8.1.0",
     "did-resolver": "^3.1.3",
     "elliptic": "^6.5.4",
     "esbuild": "^0.11.11",
diff --git a/patches/cbor+6.0.1.patch b/patches/cbor+6.0.1.patch
deleted file mode 100644
index e4b8a3a..0000000
--- a/patches/cbor+6.0.1.patch
+++ /dev/null
@@ -1,16 +0,0 @@
-diff --git a/node_modules/cbor/lib/constants.js b/node_modules/cbor/lib/constants.js
-index 932e1c5..9ca7538 100644
---- a/node_modules/cbor/lib/constants.js
-+++ b/node_modules/cbor/lib/constants.js
-@@ -2,7 +2,10 @@
- 
- // Let's get consistent first, then we can think about feature testing
- // for BigNumber support
--const {BigNumber} = require('bignumber.js')
-+const isNode = typeof process !== 'undefined'
-+  && process.versions != null
-+  && process.versions.node != null
-+const {BigNumber} = isNode ? require('bignumber.js') : require('bignumber.js/bignumber.mjs')
- 
- exports.BigNumber = BigNumber
- 
diff --git a/patches/cbor+8.1.0.patch b/patches/cbor+8.1.0.patch
new file mode 100644
index 0000000..1c8b7db
--- /dev/null
+++ b/patches/cbor+8.1.0.patch
@@ -0,0 +1,14 @@
+diff --git a/node_modules/cbor/lib/encoder.js b/node_modules/cbor/lib/encoder.js
+index 6327959..288c692 100644
+--- a/node_modules/cbor/lib/encoder.js
++++ b/node_modules/cbor/lib/encoder.js
+@@ -509,6 +509,9 @@ Call removeLoopDetectors before resuming.`)
+       if (typeof f === 'function') {
+         return f.call(obj, this)
+       }
++      if (Buffer.isBuffer(obj)) {
++        return this.semanticTypes[Buffer.name].call(obj, this, obj)
++      }
+       const converter = this.semanticTypes[obj.constructor.name]
+       if (converter) {
+         return converter.call(obj, this, obj)
diff --git a/src/cbor.test.ts b/src/cbor.test.ts
index 834a444..2e6a578 100644
--- a/src/cbor.test.ts
+++ b/src/cbor.test.ts
@@ -1,14 +1,16 @@
 import { base32 } from "rfc4648";
-import cbor from "cbor";
+import { decodeCBOR } from "./cbor";
 
 test("CBOR library works", async () => {
   const res = base32.parse(
     "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"
   );
 
-  const cborobj = cbor.decode(res);
+  const cborobj = decodeCBOR(res);
 
   expect(cborobj.err).toEqual(undefined);
   expect(cborobj.tag).toEqual(18);
   expect(cborobj.value.length).toEqual(4);
 });
+
+// TODO: test for cbor library encodes
diff --git a/src/cbor.ts b/src/cbor.ts
new file mode 100644
index 0000000..328eb2e
--- /dev/null
+++ b/src/cbor.ts
@@ -0,0 +1,18 @@
+// centralized place where cbor is included, in case we need to patch it
+
+import util from 'util';
+// @ts-ignore
+global.TextDecoder = util.TextDecoder;
+// @ts-ignore
+global.TextEncoder = util.TextEncoder;
+
+import cbor from "cbor";
+
+
+export const encodeCBOR = (obj: any): Buffer => {
+  return cbor.encode(obj);
+}
+
+export const decodeCBOR = (buf: Buffer | Uint8Array): any => {
+  return cbor.decode(buf);
+}
diff --git a/src/crypto.ts b/src/crypto.ts
index 50a071c..1e51ae2 100644
--- a/src/crypto.ts
+++ b/src/crypto.ts
@@ -1,7 +1,7 @@
-import cbor from "cbor";
 import { sha256 } from "js-sha256";
 import elliptic from "elliptic";
 import { DecodedCOSEStructure } from "./coseTypes";
+import { encodeCBOR } from "./cbor";
 
 const EC = elliptic.ec;
 const ec = new EC("p256");
@@ -22,7 +22,7 @@ export function validateCOSESignature(
   const yBuf = Buffer.from(publicKeyJwt.y, "base64");
 
   // 1) '04' + hex string of x + hex string of y
-  const publicKeyHex = `04${xBuf.toString("hex")}${yBuf.toString("hex")}}`;
+  const publicKeyHex = `04${xBuf.toString("hex")}${yBuf.toString("hex")}`;
   const key = ec.keyFromPublic(publicKeyHex, "hex");
   //   Sig_structure = [
   //     context : "Signature" / "Signature1" / "CounterSignature",
@@ -31,8 +31,12 @@ export function validateCOSESignature(
   //     external_aad : bstr,
   //     payload : bstr
   // ]
-  const SigStructure = ["Signature1", Buffer.from(protected_ as Buffer), Buffer.alloc(0), Buffer.from(payload_ as Buffer)];
-  const ToBeSigned = cbor.encode(SigStructure);
+  const bufferProtected_ = Buffer.from(protected_ as Buffer)
+  const buffer0 = Buffer.alloc(0)
+  const bufferPayload_ = Buffer.from(payload_ as Buffer)
+  const SigStructure = ["Signature1", bufferProtected_, buffer0, bufferPayload_];
+
+  const ToBeSigned = encodeCBOR(SigStructure);
   const messageHash = sha256.digest(ToBeSigned);
   const signature = {
     r: signature_.slice(0, signature_.length / 2),
diff --git a/src/main.ts b/src/main.ts
index fceb171..94bbdc2 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,10 +1,10 @@
 import { base32 } from "rfc4648";
-import cbor from "cbor";
 import did from "./did";
 import { addBase32Padding } from "./util";
 import { validateCOSESignature } from "./crypto";
 import { parseCWTClaims, parseCWTHeaders, validateCWTClaims } from "./cwt";
 import { VerificationResult } from "./generalTypes";
+import { decodeCBOR } from "./cbor";
 
 // The function below implements v1 of NZ COVID Pass - Technical Specification
 // https://nzcp.covid19.health.nz/
@@ -118,7 +118,7 @@ export const verifyPassURIWithTrustedIssuers = async (
   //       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 -- [2], a501781e6469643a7765623a6e7a63702e636f76696431392e6865616c74682e6e7a051a61819a0a041a7450400a627663a46840636f6e7465787482782668747470733a2f2f7777772e77332e6f72672f323031382f63726564656e7469616c732f7631782a68747470733a2f2f6e7a63702e636f76696431392e6865616c74682e6e7a2f636f6e74657874732f76316776657273696f6e65312e302e306474797065827456657269666961626c6543726564656e7469616c6f5075626c6963436f766964506173737163726564656e7469616c5375626a656374a369676976656e4e616d65644a61636b6a66616d696c794e616d656753706172726f7763646f626a313936302d30342d3136075060a4f54d4e304332be33ad78b1eafa4b
   //   58            -- Bytes, length next 1 byte
   //     40          -- Bytes, length: 64
-  const decodedCOSEStructure = cbor.decode(uint8array);
+  const decodedCOSEStructure = decodeCBOR(uint8array);
 
   // Decoding the byte string present in the first element of the Decoded COSE structure, as a CBOR structure and rendering it via the expanded form yields the following.
   // Let this result be known as the Decoded CWT protected headers.
@@ -128,7 +128,7 @@ export const verifyPassURIWithTrustedIssuers = async (
   //   6b65792d31    -- {Val:0}, 6b65792d31
   // 01              -- {Key:1}, 1
   // 26              -- {Val:1}, -7
-  const decodedCWTProtectedHeaders = cbor.decode(
+  const decodedCWTProtectedHeaders = decodeCBOR(
     decodedCOSEStructure.value[0]
   ) as Map<number, Buffer | number>;
 
@@ -167,7 +167,7 @@ export const verifyPassURIWithTrustedIssuers = async (
     };
   }
 
-  const rawCWTClaims = cbor.decode(decodedCOSEStructure.value[2]) as Map<
+  const rawCWTClaims = decodeCBOR(decodedCOSEStructure.value[2]) as Map<
     number | string,
     string | number | Buffer | unknown
   >;
diff --git a/yarn.lock b/yarn.lock
index baf6266..901ad24 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -927,10 +927,6 @@ base@^0.11.1:
     mixin-deep "^1.2.0"
     pascalcase "^0.1.1"
 
-bignumber.js@^9.0.1:
-  version "9.0.1"
-  resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-9.0.1.tgz#8d7ba124c882bfd8e43260c67475518d0689e4e5"
-
 bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.11.9:
   version "4.12.0"
   resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.12.0.tgz#775b3f278efbb9718eec7361f483fb36fbbfea88"
@@ -1125,12 +1121,12 @@ capture-exit@^2.0.0:
   dependencies:
     rsvp "^4.8.4"
 
-cbor@^6.0.1:
-  version "6.0.1"
-  resolved "https://registry.yarnpkg.com/cbor/-/cbor-6.0.1.tgz#f559abb1b986f54fb9cb1a6855085847bcc1cd61"
+cbor@^8.1.0:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/cbor/-/cbor-8.1.0.tgz#cfc56437e770b73417a2ecbfc9caf6b771af60d5"
+  integrity sha512-DwGjNW9omn6EwP70aXsn7FQJx5kO12tX0bZkaTjzdVFM6/7nhA4t0EENocKGx6D2Bch9PE2KzCUf5SceBdeijg==
   dependencies:
-    bignumber.js "^9.0.1"
-    nofilter "^1.0.4"
+    nofilter "^3.1.0"
 
 chalk@^2.0.0, chalk@^2.4.2:
   version "2.4.2"
@@ -3259,9 +3255,10 @@ node-releases@^1.1.76:
   version "1.1.77"
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.77.tgz#50b0cfede855dd374e7585bf228ff34e57c1c32e"
 
-nofilter@^1.0.4:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/nofilter/-/nofilter-1.0.4.tgz#78d6f4b6a613e7ced8b015cec534625f7667006e"
+nofilter@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/nofilter/-/nofilter-3.1.0.tgz#c757ba68801d41ff930ba2ec55bab52ca184aa66"
+  integrity sha512-l2NNj07e9afPnhAhvgVrCD/oy2Ai1yfLpuo3EpiO1jFTsB4sFz6oIfAfSZyQzVpkZQ9xS8ZS5g1jCBgq4Hwo0g==
 
 normalize-package-data@^2.5.0:
   version "2.5.0"