diff --git a/.gitignore b/.gitignore
index acb3481..47b3907 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,31 @@ node_modules
 ./bitauth.min.js
 ./tests.js
 
+# OSX
 
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Thumbnails
+._*
+
+# Files that might appear on external disk
+.Spotlight-V100
+.Trashes
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# VIM ignore
+
+[._]*.s[a-w][a-z]
+[._]s[a-w][a-z]
+*.un~
+Session.vim
+.netrwhist
+*~
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index fc5f4b2..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-language: node_js
-sudo: false
-compiler:
-  - gcc
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    packages:
-    - g++-6
-node_js:
-  - '8'
-  - '10'
-  - '12'
-before_install:
-  - export CXX="g++-6"
-install:
-  - npm install
-script: npm run test
diff --git a/README.md b/README.md
index dbe12ce..218c13b 100644
--- a/README.md
+++ b/README.md
@@ -18,12 +18,6 @@ Install with Node.js:
 npm install bitauth
 ```
 
-To generate a browser bundle, you can then run:
-
-```bash
-gulp browser
-```
-
 ## Advantages over other authentication mechanisms
 
 * By signing each request, man in the middle attacks are impossible.
@@ -199,25 +193,3 @@ BitAuth exposes a connect middleware for use in connect or ExpressJS application
 var bitauth = require('bitauth');
 app.use( bitauth.middleware );
 ```
-
-## Development
-
-To build a browser compatible version of BitAuth, run the following command from the project's root directory:
-
-```bash
-gulp browser
-```
-
-This will output `bitauth.min.js` to project directory. The script can be loaded using `require('bitauth')`.
-
-To then run tests for a web browser:
-
-```bash
-gulp test:browser
-```
-
-To run tests for Node.js:
-
-```bash
-gulp test:node
-```
diff --git a/bower.json b/bower.json
deleted file mode 100644
index 80fa544..0000000
--- a/bower.json
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-  "name": "bitauth",
-  "main": "./bitauth.min.js",
-  "version": "0.4.0",
-  "homepage": "https://github.com/bitpay/bitauth",
-  "authors": [
-    "BitPay, Inc."
-  ],
-  "description": "Passwordless authentication using Bitcoin cryptography",
-  "moduleType": [
-    "globals"
-  ],
-  "keywords": [
-    "bitcoin",
-    "bitcore",
-    "btc",
-    "satoshi"
-  ],
-  "license": "MIT",
-  "ignore": [
-    "**/.*",
-    "CONTRIBUTING.md",
-    "gulpfile.js",
-    "lib",
-    "index.js",
-    "karma.conf.js",
-    "test"
-  ]
-}
diff --git a/browserify.js b/browserify.js
deleted file mode 100644
index 604f4c3..0000000
--- a/browserify.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const fs = require('fs');
-const browserify = require('browserify');
-const minifyStream = require('minify-stream');
-
-// This currently generates the dist files but there are no tests done
-
-browserify('index.js')
-  .bundle()
-  .pipe(fs.createWriteStream('./dist/bitauth.js'));
-
-fs.createReadStream('./dist/bitauth.js')
-  .pipe(minifyStream({ sourceMap: false }))
-  .pipe(fs.createWriteStream('./dist/bitauth.min.js'));
-
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..63c075b
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,24 @@
+module.exports = function(config) {
+  config.set({
+    basePath: './',
+    frameworks: ['browserify', 'mocha'],
+    files: [
+      'test/*.js'
+    ],
+    exclude: [
+    ],
+    preprocessors: {
+      'test/*.js': [ 'browserify' ]
+    },
+    browserify: {
+      debug: true
+    },
+    reporters: ['progress'],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_INFO,
+    autoWatch: false,
+    browsers: ['Chrome'],
+    singleRun: true
+  })
+}
diff --git a/lib/bitauth-browserify.js b/lib/bitauth-browserify.js
index 9025dc8..119e88b 100644
--- a/lib/bitauth-browserify.js
+++ b/lib/bitauth-browserify.js
@@ -19,7 +19,7 @@ BitAuth._getPublicKeyFromPrivateKey = function(privkey) {
   } else {
     privKeyString = privkey;
   }
-  const keys = ecdsa.keyPair(privkey, 'hex');
+  const keys = ecdsa.keyFromPrivate(privKeyString, 'hex');
 
   // compressed public key
   const pubKey = keys.getPublic();
@@ -36,12 +36,13 @@ BitAuth._getPublicKeyFromPrivateKey = function(privkey) {
 };
 
 BitAuth._sign = function(hashBuffer, privkey) {
-  const signature = ecdsa.sign(hashBuffer.toString('hex'), privkey);
+  const keys = ecdsa.keyFromPrivate(privkey, 'hex');
+  const signature = keys.sign(hashBuffer.toString('hex'));
   return signature.toDER('hex');
 };
 
 BitAuth._verifySignature = function(hashBuffer, signatureBuffer, pubkey) {
-  return ecdsa.verify(hashBuffer.toString('hex'), signatureBuffer, pubkey);
+  return ecdsa.verify(hashBuffer.toString('hex'), signatureBuffer, pubkey, 'hex');
 };
 
 module.exports = BitAuth;
diff --git a/package.json b/package.json
index bbc9ea7..cf31b1d 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,8 @@
     }
   ],
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "test-browser": "karma start karma.conf.js"
   },
   "main": "index.js",
   "version": "0.4.0",
@@ -38,8 +39,14 @@
   },
   "devDependencies": {
     "benchmark": "^2.1.4",
+    "browserify": "^16.5.1",
     "chai": "^4.2.0",
-    "mocha": "^6.2.2"
+    "karma": "^4.4.1",
+    "karma-browserify": "^7.0.0",
+    "karma-chrome-launcher": "^3.1.0",
+    "karma-mocha": "^1.3.0",
+    "mocha": "^6.2.2",
+    "watchify": "^3.11.1"
   },
   "license": "MIT"
 }