diff --git a/karma.conf.js b/karma.conf.js
index 4f816ae..092dbe5 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -77,7 +77,7 @@ module.exports = function(config) {
   config.set(withBrowserStack({
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['browserify', 'mocha'],
+    frameworks: ['mocha'],
 
     // list of files / patterns to load in the browser
     files: [
@@ -85,19 +85,6 @@ module.exports = function(config) {
       'test/**/*.js',
     ],
 
-    // preprocess matching files before serving them to the browser
-    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
-    preprocessors: {
-      'lib/**/*.js':  ['browserify'],
-      'test/**/*.js': ['browserify'],
-    },
-    browserify: {
-      debug: true,
-      transform: [
-        ['babelify', { global: true, presets: ['env'] }]
-      ]
-    },
-
     // test results reporter to use
     // possible values: 'dots', 'progress'
     // available reporters: https://npmjs.org/browse/keyword/karma-reporter
diff --git a/package.json b/package.json
index c02ca01..3e3d4b7 100644
--- a/package.json
+++ b/package.json
@@ -10,16 +10,11 @@
     "safe-stable-stringify": "^1.0.1"
   },
   "devDependencies": {
-    "babel-core": "^6.26.0",
-    "babel-preset-env": "^1.6.1",
-    "babelify": "^8.0.0",
-    "browserify": "^16.1.1",
     "chai": "^4.1.2",
     "chai-json-schema": "^1.5.0",
     "coveralls": "^3.0.0",
     "eslint": "^4.19.0",
     "karma": "^2.0.0",
-    "karma-browserify": "^5.2.0",
     "karma-browserstack-launcher": "^1.3.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",