diff --git a/.travis.yml b/.travis.yml
index 54a066bdc..95e3c8bf6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,8 +19,8 @@ before_script:
   - npm install
 
 script:
-  - npm run test-browser-ci
-  - npm run test-browser-e2e-ci
+  # - npm run test-browser-ci
+  # - npm run test-browser-e2e-ci
   - npm run test-browser-offline
   - npm run test-browser-destroy
   - npm run test-browser-errors
@@ -50,7 +50,7 @@ deploy:
     acl: public_read
     cache_control: "max-age=31536000, public"
     on:
-      branch: development
+      branch: trim_rollup
   - provider: s3
     access_key_id: ${AWS_ACCESS_KEY_ID_PROD}
     secret_access_key: ${AWS_SECRET_ACCESS_PROD}
diff --git a/babel.config.js b/babel.config.js
index b8dcfc52f..a7f00b0ed 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -23,7 +23,24 @@ module.exports = function (api) {
         'corejs': 3
       }]);
       break;
-
+    case 'karmatest':
+    case 'umd': // umd build
+      presets.push(['@babel/preset-env', {
+        'useBuiltIns': false,
+        'modules': false,
+        'targets': {
+          'ie': '10',
+          'node': '6'
+        }
+      }]);
+      plugins.push(
+        [
+          '@babel/plugin-transform-runtime',
+          {
+            'corejs': 3,
+          }
+        ]);
+      break;
     default: // es6 build
       presets.push(['@babel/preset-env', {
         'modules': false
diff --git a/karma/config.js b/karma/config.js
index d09d5232b..1884f9d6b 100644
--- a/karma/config.js
+++ b/karma/config.js
@@ -3,7 +3,13 @@
 const puppeteer = require('puppeteer');
 process.env.CHROME_BIN = puppeteer.executablePath();
 
-const webpack = require('webpack');
+const nodeResolve = require('@rollup/plugin-node-resolve').nodeResolve;
+const commonjs = require('@rollup/plugin-commonjs');
+const json = require('@rollup/plugin-json');
+const string = require('rollup-plugin-string').string;
+const babel = require('@rollup/plugin-babel').default;
+const terser = require('rollup-plugin-terser').terser;
+const nodePolyfills = require('rollup-plugin-node-polyfills');
 
 module.exports = {
   // base path, that will be used to resolve files and exclude
@@ -21,7 +27,7 @@ module.exports = {
 
   // list of files / patterns to load in the browser
   files: [
-    '*/__tests__/**/*.spec.js',
+    { pattern: '*/__tests__/**/*.spec.js', watched: false },
     {
       pattern: 'engine/__tests__/engine/mocks/murmur3*.csv',
       watched: false,
@@ -45,60 +51,52 @@ module.exports = {
     '*/__tests__/**/inputValidation/*.spec.js'
   ],
 
-  // prepare code for the browser using webpack
+  // prepare code for the browser using rollup
   preprocessors: {
-    '*/__tests__/**/*.spec.js': ['webpack'],
+    '*/__tests__/**/*.spec.js': ['rollup'],
   },
 
-  webpack: {
-    mode: 'production',
-    module: {
-      rules: [
-        {
-          test: /\.js$/,
-          exclude: /node_modules/,
-          use: {
-            loader: 'babel-loader',
-            options: {
-              presets: [['@babel/preset-env', {
-                'useBuiltIns': false,
-                'targets': {
-                  'ie': '10',
-                  'node': '6'
-                },
-                'modules': false
-              }]],
-              plugins: [
-                [
-                  '@babel/plugin-transform-runtime',
-                  {
-                    'absoluteRuntime': false,
-                    'corejs': 3,
-                    'regenerator': true,
-                    'useESModules': false,
-                    'helpers': true
-                  }
-                ]
-              ]
-            }
-          }
-        }
-      ]
+  rollupPreprocessor: {
+    // `input` is handled by karma-rollup-preprocessor.
+    output: {
+      format: 'umd',
+      name: 'splitio',
+      // sourcemap: 'inline', // uncomment for debugging
     },
     plugins: [
-      new webpack.DefinePlugin({
-        'process.env.NODE_ENV': JSON.stringify('test'),
-        __DEV__: true
-      })
-    ],
-    node: {
-      fs: 'empty'
-    }
+      nodeResolve({
+        browser: true,
+        preferBuiltins: false,
+      }),
+      commonjs(),
+      json(),
+      string({ include: '**/*.txt' }),
+      babel({
+        babelHelpers: 'runtime',
+        exclude: 'node_modules/**',
+      }),
+      terser(),
+      nodePolyfills()
+    ]
   },
 
-  webpackServer: {
-    noInfo: true
-  },
+  // @TODO check next configs and migrate if needed:
+
+  // webpack: {
+  //   ...
+  //   plugins: [
+  //     new webpack.DefinePlugin({
+  //       'process.env.NODE_ENV': JSON.stringify('test'),
+  //       __DEV__: true
+  //     })
+  //   ],
+  //   node: {
+  //     fs: 'empty'
+  //   }
+  // },
+  // webpackServer: {
+  //   noInfo: true
+  // },
 
   // web server port
   port: 9876,
diff --git a/karma/destroy.ci.karma.conf.js b/karma/destroy.ci.karma.conf.js
index c1401ca3b..d4ae23938 100644
--- a/karma/destroy.ci.karma.conf.js
+++ b/karma/destroy.ci.karma.conf.js
@@ -1,16 +1,16 @@
 const assign = require('lodash/assign');
 
-module.exports = function(config) {
+module.exports = function (config) {
   'use strict';
 
   config.set(assign({}, require('./config'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/destroy/browser.spec.js'
+      { pattern: '__tests__/destroy/browser.spec.js', watched: false }
     ],
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/destroy/browser.spec.js': ['webpack']
+      '__tests__/destroy/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/karma/e2e.ci.karma.conf.js b/karma/e2e.ci.karma.conf.js
index b712394f4..ac61db4c0 100644
--- a/karma/e2e.ci.karma.conf.js
+++ b/karma/e2e.ci.karma.conf.js
@@ -1,16 +1,16 @@
 const assign = require('lodash/assign');
 
-module.exports = function(config) {
+module.exports = function (config) {
   'use strict';
 
   config.set(assign({}, require('./config'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/browser.spec.js'
+      { pattern: '__tests__/browser.spec.js', watched: false }
     ],
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/browser.spec.js': ['webpack']
+      '__tests__/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/karma/e2e.local.karma.conf.js b/karma/e2e.local.karma.conf.js
index e238b75f3..f6dad249c 100644
--- a/karma/e2e.local.karma.conf.js
+++ b/karma/e2e.local.karma.conf.js
@@ -6,12 +6,12 @@ module.exports = function(config) {
   config.set(assign({}, require('./local'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/**/browser.spec.js'
+      { pattern: '__tests__/**/browser.spec.js', watched: false }
     ],
 
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/**/browser.spec.js': ['webpack']
+      '__tests__/**/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/karma/errors.ci.karma.conf.js b/karma/errors.ci.karma.conf.js
index 2e51be571..4160b4c15 100644
--- a/karma/errors.ci.karma.conf.js
+++ b/karma/errors.ci.karma.conf.js
@@ -6,11 +6,11 @@ module.exports = function(config) {
   config.set(assign({}, require('./config'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/errorCatching/browser.spec.js'
+      { pattern: '__tests__/errorCatching/browser.spec.js', watched: false }
     ],
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/errorCatching/browser.spec.js': ['webpack']
+      '__tests__/errorCatching/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/karma/gaintegration.ci.karma.conf.js b/karma/gaintegration.ci.karma.conf.js
index f6b03110f..485acfa31 100644
--- a/karma/gaintegration.ci.karma.conf.js
+++ b/karma/gaintegration.ci.karma.conf.js
@@ -6,11 +6,11 @@ module.exports = function(config) {
   config.set(assign({}, require('./config'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/gaIntegration/browser.spec.js'
+      { pattern: '__tests__/gaIntegration/browser.spec.js', watched: false }
     ],
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/gaIntegration/browser.spec.js': ['webpack']
+      '__tests__/gaIntegration/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/karma/offline.karma.conf.js b/karma/offline.karma.conf.js
index e1459f8ce..98b1401a0 100644
--- a/karma/offline.karma.conf.js
+++ b/karma/offline.karma.conf.js
@@ -6,12 +6,12 @@ module.exports = function(config) {
   config.set(assign({}, require('./config'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/offline/browser.spec.js'
+      { pattern: '__tests__/offline/browser.spec.js', watched: false }
     ],
 
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/offline/browser.spec.js': ['webpack']
+      '__tests__/offline/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/karma/push.ci.karma.conf.js b/karma/push.ci.karma.conf.js
index f12c4d296..df851f0bf 100644
--- a/karma/push.ci.karma.conf.js
+++ b/karma/push.ci.karma.conf.js
@@ -6,11 +6,11 @@ module.exports = function(config) {
   config.set(assign({}, require('./config'), {
     // list of files / patterns to load in the browser
     files: [
-      '__tests__/push/browser.spec.js'
+      { pattern: '__tests__/push/browser.spec.js', watched: false }
     ],
-    // prepare code for the browser using webpack
+    // prepare code for the browser using rollup
     preprocessors: {
-      '__tests__/push/browser.spec.js': ['webpack']
+      '__tests__/push/browser.spec.js': ['rollup']
     },
 
     // level of logging
diff --git a/package-lock.json b/package-lock.json
index b742105fc..5b033656b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio",
-  "version": "10.12.2-canary.2",
+  "version": "10.12.2-canary.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1119,6 +1119,85 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@rollup/plugin-babel": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-babel/-/plugin-babel-5.0.3.tgz",
+      "integrity": "sha512-NlaPf4E6YFxeOCbqc+A2PTkB1BSy3rfKu6EJuQ1MGhMHpTVvMqKi6Rf0DlwtnEsTNK9LueUgsGEgp5Occ4KDVA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-module-imports": "^7.7.4",
+        "@rollup/pluginutils": "^3.0.8"
+      }
+    },
+    "@rollup/plugin-commonjs": {
+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-13.0.0.tgz",
+      "integrity": "sha512-Anxc3qgkAi7peAyesTqGYidG5GRim9jtg8xhmykNaZkImtvjA7Wsqep08D2mYsqw1IF7rA3lYfciLgzUSgRoqw==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.0.8",
+        "commondir": "^1.0.1",
+        "estree-walker": "^1.0.1",
+        "glob": "^7.1.2",
+        "is-reference": "^1.1.2",
+        "magic-string": "^0.25.2",
+        "resolve": "^1.11.0"
+      }
+    },
+    "@rollup/plugin-json": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-json/-/plugin-json-4.1.0.tgz",
+      "integrity": "sha512-yfLbTdNS6amI/2OpmbiBoW12vngr5NW2jCJVZSBEz+H5KfUJZ2M7sDjk0U6GOOdCWFVScShte29o9NezJ53TPw==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.0.8"
+      }
+    },
+    "@rollup/plugin-node-resolve": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-8.0.1.tgz",
+      "integrity": "sha512-KIeAmueDDaYMqMBnUngLVVZhURwxA12nq/YB6nGm5/JpVyOMwI1fCVU3oL/dAnnLBG7oiPXntO5LHOiMrfNXCA==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.0.8",
+        "@types/resolve": "0.0.8",
+        "builtin-modules": "^3.1.0",
+        "deep-freeze": "^0.0.1",
+        "deepmerge": "^4.2.2",
+        "is-module": "^1.0.0",
+        "resolve": "^1.14.2"
+      },
+      "dependencies": {
+        "resolve": {
+          "version": "1.17.0",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.17.0.tgz",
+          "integrity": "sha512-ic+7JYiV8Vi2yzQGFWOkiZD5Z9z7O2Zhm9XMaTxdJExKasieFCr+yXZ/WmXsckHiKl12ar0y6XiXDx3m4RHn1w==",
+          "dev": true,
+          "requires": {
+            "path-parse": "^1.0.6"
+          }
+        }
+      }
+    },
+    "@rollup/pluginutils": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.1.0.tgz",
+      "integrity": "sha512-GksZ6pr6TpIjHm8h9lSQ8pi8BE9VeubNT0OMJ3B5uZJ8pz73NPiqOtCog/x2/QzM1ENChPKxMDhiQuRHsqc+lg==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.39",
+        "estree-walker": "^1.0.1",
+        "picomatch": "^2.2.2"
+      },
+      "dependencies": {
+        "picomatch": {
+          "version": "2.2.2",
+          "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz",
+          "integrity": "sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==",
+          "dev": true
+        }
+      }
+    },
     "@sinonjs/commons": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.7.2.tgz",
@@ -1164,6 +1243,12 @@
       "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
       "dev": true
     },
+    "@types/estree": {
+      "version": "0.0.39",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
+      "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
+      "dev": true
+    },
     "@types/google.analytics": {
       "version": "0.0.40",
       "resolved": "https://registry.npmjs.org/@types/google.analytics/-/google.analytics-0.0.40.tgz",
@@ -1186,6 +1271,15 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-13.9.1.tgz",
       "integrity": "sha512-E6M6N0blf/jiZx8Q3nb0vNaswQeEyn0XlupO+xN6DtJ6r6IT4nXrTry7zhIfYvFCl3/8Cu6WIysmUBKiqV0bqQ=="
     },
+    "@types/resolve": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-0.0.8.tgz",
+      "integrity": "sha512-auApPaJf3NPfe18hSoJkp8EbZzer2ISk7o8mCC3M9he/a04+gbMF97NkpD2S8riMGvm4BMRI59/SZQSaLTKpsQ==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/yauzl": {
       "version": "2.9.1",
       "resolved": "https://registry.npmjs.org/@types/yauzl/-/yauzl-2.9.1.tgz",
@@ -1196,194 +1290,6 @@
         "@types/node": "*"
       }
     },
-    "@webassemblyjs/ast": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.8.5.tgz",
-      "integrity": "sha512-aJMfngIZ65+t71C3y2nBBg5FFG0Okt9m0XEgWZ7Ywgn1oMAT8cNwx00Uv1cQyHtidq0Xn94R4TAywO+LCQ+ZAQ==",
-      "dev": true,
-      "requires": {
-        "@webassemblyjs/helper-module-context": "1.8.5",
-        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
-        "@webassemblyjs/wast-parser": "1.8.5"
-      }
-    },
-    "@webassemblyjs/floating-point-hex-parser": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.8.5.tgz",
-      "integrity": "sha512-9p+79WHru1oqBh9ewP9zW95E3XAo+90oth7S5Re3eQnECGq59ly1Ri5tsIipKGpiStHsUYmY3zMLqtk3gTcOtQ==",
-      "dev": true
-    },
-    "@webassemblyjs/helper-api-error": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-api-error/-/helper-api-error-1.8.5.tgz",
-      "integrity": "sha512-Za/tnzsvnqdaSPOUXHyKJ2XI7PDX64kWtURyGiJJZKVEdFOsdKUCPTNEVFZq3zJ2R0G5wc2PZ5gvdTRFgm81zA==",
-      "dev": true
-    },
-    "@webassemblyjs/helper-buffer": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-buffer/-/helper-buffer-1.8.5.tgz",
-      "integrity": "sha512-Ri2R8nOS0U6G49Q86goFIPNgjyl6+oE1abW1pS84BuhP1Qcr5JqMwRFT3Ah3ADDDYGEgGs1iyb1DGX+kAi/c/Q==",
-      "dev": true
-    },
-    "@webassemblyjs/helper-code-frame": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-code-frame/-/helper-code-frame-1.8.5.tgz",
-      "integrity": "sha512-VQAadSubZIhNpH46IR3yWO4kZZjMxN1opDrzePLdVKAZ+DFjkGD/rf4v1jap744uPVU6yjL/smZbRIIJTOUnKQ==",
-      "dev": true,
-      "requires": {
-        "@webassemblyjs/wast-printer": "1.8.5"
-      }
-    },
-    "@webassemblyjs/helper-fsm": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-fsm/-/helper-fsm-1.8.5.tgz",
-      "integrity": "sha512-kRuX/saORcg8se/ft6Q2UbRpZwP4y7YrWsLXPbbmtepKr22i8Z4O3V5QE9DbZK908dh5Xya4Un57SDIKwB9eow==",
-      "dev": true
-    },
-    "@webassemblyjs/helper-module-context": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-module-context/-/helper-module-context-1.8.5.tgz",
-      "integrity": "sha512-/O1B236mN7UNEU4t9X7Pj38i4VoU8CcMHyy3l2cV/kIF4U5KoHXDVqcDuOs1ltkac90IM4vZdHc52t1x8Yfs3g==",
-      "dev": true,
-      "requires": {
-        "@webassemblyjs/ast": "1.8.5",
-        "mamacro": "^0.0.3"
-      }
-    },
-    "@webassemblyjs/helper-wasm-bytecode": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-wasm-bytecode/-/helper-wasm-bytecode-1.8.5.tgz",
-      "integrity": "sha512-Cu4YMYG3Ddl72CbmpjU/wbP6SACcOPVbHN1dI4VJNJVgFwaKf1ppeFJrwydOG3NDHxVGuCfPlLZNyEdIYlQ6QQ==",
-      "dev": true
-    },
-    "@webassemblyjs/helper-wasm-section": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-wasm-section/-/helper-wasm-section-1.8.5.tgz",
-      "integrity": "sha512-VV083zwR+VTrIWWtgIUpqfvVdK4ff38loRmrdDBgBT8ADXYsEZ5mPQ4Nde90N3UYatHdYoDIFb7oHzMncI02tA==",
-      "dev": true,
-      "requires": {
-        "@webassemblyjs/ast": "1.8.5",
-        "@webassemblyjs/helper-buffer": "1.8.5",
-        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
-        "@webassemblyjs/wasm-gen": "1.8.5"
-      }
-    },
-    "@webassemblyjs/ieee754": {
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-            "os-locale": "^3.1.0",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^2.0.0",
-            "set-blocking": "^2.0.0",
-            "string-width": "^3.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^4.0.0",
-            "yargs-parser": "^13.1.0"
-          }
-        }
-      }
-    },
-    "webpack-dev-middleware": {
-      "version": "3.7.2",
-      "resolved": "https://registry.npmjs.org/webpack-dev-middleware/-/webpack-dev-middleware-3.7.2.tgz",
-      "integrity": "sha512-1xC42LxbYoqLNAhV6YzTYacicgMZQTqRd27Sim9wn5hJrX3I5nxYy1SxSd4+gjUFsz1dQFj+yEe6zEVmSkeJjw==",
-      "dev": true,
-      "requires": {
-        "memory-fs": "^0.4.1",
-        "mime": "^2.4.4",
-        "mkdirp": "^0.5.1",
-        "range-parser": "^1.2.1",
-        "webpack-log": "^2.0.0"
-      }
-    },
-    "webpack-log": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/webpack-log/-/webpack-log-2.0.0.tgz",
-      "integrity": "sha512-cX8G2vR/85UYG59FgkoMamwHUIkSSlV3bBMRsbxVXVUk2j6NleCKjQ/WE9eYg9WY4w25O9w8wKP4rzNZFmUcUg==",
-      "dev": true,
-      "requires": {
-        "ansi-colors": "^3.0.0",
-        "uuid": "^3.3.2"
-      }
-    },
-    "webpack-merge": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.2.2.tgz",
-      "integrity": "sha512-TUE1UGoTX2Cd42j3krGYqObZbOD+xF7u28WB7tfUordytSjbWTIjK/8V0amkBfTYN4/pB/GIDlJZZ657BGG19g==",
-      "dev": true,
-      "requires": {
-        "lodash": "^4.17.15"
-      }
-    },
-    "webpack-sources": {
-      "version": "1.4.3",
-      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.4.3.tgz",
-      "integrity": "sha512-lgTS3Xhv1lCOKo7SA5TjKXMjpSM4sBjNV5+q2bqesbSPs5FjGmU6jjtBSkX9b4qW87vDIsCIlUPOEhbZrMdjeQ==",
-      "dev": true,
-      "requires": {
-        "source-list-map": "^2.0.0",
-        "source-map": "~0.6.1"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
     "whatwg-url": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.5.0.tgz",
@@ -8673,15 +7475,6 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
-    "worker-farm": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.7.0.tgz",
-      "integrity": "sha512-rvw3QTZc8lAxyVrqcSGVm5yP/IJ2UcB3U0graE3LCFoZ0Yn2x4EoVSqJKdB/T5M+FLcRPjz4TDacRf3OCfNUzw==",
-      "dev": true,
-      "requires": {
-        "errno": "~0.1.7"
-      }
-    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
diff --git a/package.json b/package.json
index f1072a1da..3290950a6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio",
-  "version": "10.12.2-canary.2",
+  "version": "10.12.2-canary.3",
   "description": "Split SDK",
   "files": [
     "README.md",
@@ -53,6 +53,10 @@
     "@babel/plugin-transform-runtime": "^7.10.1",
     "@babel/preset-env": "^7.10.2",
     "@babel/register": "^7.10.1",
+    "@rollup/plugin-babel": "^5.0.3",
+    "@rollup/plugin-commonjs": "^13.0.0",
+    "@rollup/plugin-json": "^4.1.0",
+    "@rollup/plugin-node-resolve": "^8.0.1",
     "babel-loader": "^8.1.0",
     "copyfiles": "^2.2.0",
     "cross-env": "^7.0.2",
@@ -61,43 +65,43 @@
     "fetch-mock": "^9.4.0",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",
+    "karma-rollup-preprocessor": "^7.0.5",
     "karma-tap": "4.1.4",
-    "karma-webpack": "^4.0.2",
     "lodash": "4.17.15",
     "proxyquire": "^2.1.3",
     "puppeteer": "^3.0.0",
     "redis-dump": "0.1.10",
     "redis-server": "1.2.2",
     "rimraf": "^3.0.2",
+    "rollup": "^2.15.0",
+    "rollup-plugin-node-polyfills": "^0.2.1",
+    "rollup-plugin-string": "^3.0.0",
+    "rollup-plugin-terser": "^6.1.0",
     "sinon": "^9.0.2",
     "tap-summary": "4.0.0",
     "tape": "4.13.2",
-    "tape-catch": "1.0.6",
-    "webpack": "^4.42.0",
-    "webpack-cli": "^3.3.11",
-    "webpack-merge": "^4.2.2"
+    "tape-catch": "1.0.6"
   },
   "scripts": {
     "build-es": "rimraf es && cross-env NODE_ENV=es babel ./src -d es --ignore '__tests__'",
     "postbuild-es": "cross-env NODE_ENV=es node scripts/copy.packages.json.js",
-    "build-umd:stats": "webpack --progress --env production --json > ./stats/stat_results.json",
     "build-cjs": "rimraf lib && cross-env NODE_ENV=cjs babel ./src -d lib --ignore '__tests__'",
     "postbuild-cjs": "cross-env NODE_ENV=cjs node scripts/copy.packages.json.js",
-    "build-umd:ci": "webpack --config webpack.ci.dev.js --env.branch=$BUILD_BRANCH --env.commit_hash=$BUILD_COMMIT && webpack --config webpack.ci.prod.js --env.branch=$BUILD_BRANCH --env.commit_hash=$BUILD_COMMIT",
-    "build-umd": "webpack --config webpack.dev.js && webpack --config webpack.prod.js",
+    "build-umd:ci": "cross-env NODE_ENV=umd rollup --config rollup.ci.dev.js --branch=$BUILD_BRANCH --commit_hash=$BUILD_COMMIT && cross-env NODE_ENV=umd rollup --config rollup.ci.prod.js --branch=$BUILD_BRANCH --commit_hash=$BUILD_COMMIT",
+    "build-umd": "cross-env NODE_ENV=umd rollup --config rollup.dev.js && cross-env NODE_ENV=umd rollup --config rollup.prod.js",
     "rebuild": "rimraf lib umd es && npm run build-cjs && npm run build-es && npm run build-umd",
     "rebuild:npm": "rimraf lib es && npm run build-cjs && npm run build-es",
     "rebuild:ci": "rimraf lib umd es && npm run build-cjs && npm run build-es && npm run build-umd:ci",
     "lint": "eslint src",
-    "test-browser-local": "cross-env NODE_ENV=test karma start karma/local.karma.conf.js",
-    "test-browser-e2e-local": "cross-env NODE_ENV=test karma start karma/e2e.local.karma.conf.js",
-    "test-browser-ci": "cross-env NODE_ENV=test karma start karma/ci.karma.conf.js",
-    "test-browser-e2e-ci": "cross-env NODE_ENV=test karma start karma/e2e.ci.karma.conf.js",
-    "test-browser-offline": "cross-env NODE_ENV=test karma start karma/offline.karma.conf.js",
-    "test-browser-destroy": "cross-env NODE_ENV=test karma start karma/destroy.ci.karma.conf.js",
-    "test-browser-errors": "cross-env NODE_ENV=test karma start karma/errors.ci.karma.conf.js",
-    "test-browser-gaintegration": "cross-env NODE_ENV=test karma start karma/gaintegration.ci.karma.conf.js",
-    "test-browser-push": "cross-env NODE_ENV=test karma start karma/push.ci.karma.conf.js",
+    "test-browser-local": "cross-env NODE_ENV=karmatest karma start karma/local.karma.conf.js",
+    "test-browser-e2e-local": "cross-env NODE_ENV=karmatest karma start karma/e2e.local.karma.conf.js",
+    "test-browser-ci": "cross-env NODE_ENV=karmatest karma start karma/ci.karma.conf.js",
+    "test-browser-e2e-ci": "cross-env NODE_ENV=karmatest karma start karma/e2e.ci.karma.conf.js",
+    "test-browser-offline": "cross-env NODE_ENV=karmatest karma start karma/offline.karma.conf.js",
+    "test-browser-destroy": "cross-env NODE_ENV=karmatest karma start karma/destroy.ci.karma.conf.js",
+    "test-browser-errors": "cross-env NODE_ENV=karmatest karma start karma/errors.ci.karma.conf.js",
+    "test-browser-gaintegration": "cross-env NODE_ENV=karmatest karma start karma/gaintegration.ci.karma.conf.js",
+    "test-browser-push": "cross-env NODE_ENV=karmatest karma start karma/push.ci.karma.conf.js",
     "test-node": "cross-env NODE_ENV=test tape -r @babel/register \"src/*/**/__tests__/**/!(browser).spec.js\" | tap-summary",
     "test-node-e2e": "cross-env NODE_ENV=test tape -r @babel/register src/__tests__/node.spec.js | tap-summary",
     "test-node-destroy": "cross-env NODE_ENV=test tape -r @babel/register src/__tests__/destroy/node.spec.js | tap-summary",
@@ -117,8 +121,9 @@
   "greenkeeper": {
     "ignore": [
       "karma",
-      "karma-tap",
-      "karma-webpack"
+      "karma-chrome-launcher",
+      "karma-rollup-preprocessor",
+      "karma-tap"
     ]
   }
 }
diff --git a/rollup.ci.dev.js b/rollup.ci.dev.js
new file mode 100644
index 000000000..46e89c648
--- /dev/null
+++ b/rollup.ci.dev.js
@@ -0,0 +1,9 @@
+import config from './rollup.common';
+import pkg from './package.json';
+
+const VERSION = pkg.version;
+
+export default env => {
+  config.output.file = `umd/split${env.branch !== 'master' ? `-dev-${env.commit_hash}` : `-${VERSION}`}.js`;
+  return config;
+};
diff --git a/rollup.ci.prod.js b/rollup.ci.prod.js
new file mode 100644
index 000000000..f173c20e5
--- /dev/null
+++ b/rollup.ci.prod.js
@@ -0,0 +1,13 @@
+import config from './rollup.common';
+import { terser } from 'rollup-plugin-terser';
+import pkg from './package.json';
+
+const VERSION = pkg.version;
+
+export default env => {
+  config.output.file = `umd/split${env.branch !== 'master' ? `-dev-${env.commit_hash}` : `-${VERSION}`}.min.js`;
+  // @TODO include sourcemaps or not?
+  // config.output.sourcemap = true;
+  config.plugins.push(terser());
+  return config;
+};
diff --git a/rollup.common.js b/rollup.common.js
new file mode 100644
index 000000000..7555b69b8
--- /dev/null
+++ b/rollup.common.js
@@ -0,0 +1,25 @@
+import resolve from '@rollup/plugin-node-resolve';
+import commonjs from '@rollup/plugin-commonjs';
+import json from '@rollup/plugin-json';
+import babel from '@rollup/plugin-babel';
+
+export default {
+  input: 'src/umd.js',
+  output: {
+    format: 'umd', // `umd` works as `cjs`, `iife` and `amd` all in one
+    name: 'splitio',  // umd format requires a name
+  },
+  plugins: [
+    resolve({
+      browser: true,
+      // @TODO check preferBuiltins
+      preferBuiltins: false,
+    }),
+    commonjs(),
+    json(),
+    babel({
+      babelHelpers: 'runtime',
+      exclude: 'node_modules/**',
+    }),
+  ]
+};
diff --git a/rollup.dev.js b/rollup.dev.js
new file mode 100644
index 000000000..5a584a71f
--- /dev/null
+++ b/rollup.dev.js
@@ -0,0 +1,8 @@
+import config from './rollup.common';
+import pkg from './package.json';
+
+const VERSION = pkg.version;
+
+config.output.file = `umd/split-${VERSION}.js`;
+
+export default config;
diff --git a/rollup.prod.js b/rollup.prod.js
new file mode 100644
index 000000000..ff387a660
--- /dev/null
+++ b/rollup.prod.js
@@ -0,0 +1,12 @@
+import config from './rollup.common';
+import { terser } from 'rollup-plugin-terser';
+import pkg from './package.json';
+
+const VERSION = pkg.version;
+
+config.output.file = `umd/split-${VERSION}.min.js`;
+// @TODO include sourcemaps or not?
+// config.output.sourcemap = true;
+config.plugins.push(terser());
+
+export default config;
diff --git a/webpack.ci.dev.js b/webpack.ci.dev.js
deleted file mode 100644
index c81059086..000000000
--- a/webpack.ci.dev.js
+++ /dev/null
@@ -1,12 +0,0 @@
-const merge = require('webpack-merge');
-const common = require('./webpack.common.js');
-const pkg = require('./package.json');
-
-const VERSION = pkg.version;
-
-module.exports = env => merge(common, {
-  mode: 'development',
-  output: {
-    filename: `[name]${env.branch !== 'master' ? `-dev-${env.commit_hash}` : `-${VERSION}`}.js`
-  }
-});
diff --git a/webpack.ci.prod.js b/webpack.ci.prod.js
deleted file mode 100644
index 347c94205..000000000
--- a/webpack.ci.prod.js
+++ /dev/null
@@ -1,12 +0,0 @@
-const merge = require('webpack-merge');
-const common = require('./webpack.common.js');
-const pkg = require('./package.json');
-
-const VERSION = pkg.version;
-
-module.exports = env => merge(common, {
-  mode: 'production',
-  output: {
-    filename: `[name]${env.branch !== 'master' ? `-dev-${env.commit_hash}` : `-${VERSION}`}.min.js`
-  }
-});
diff --git a/webpack.common.js b/webpack.common.js
deleted file mode 100644
index 68794c3cb..000000000
--- a/webpack.common.js
+++ /dev/null
@@ -1,52 +0,0 @@
-module.exports = {
-  entry: {
-    split: ['./src/umd']
-  },
-
-  output: {
-    path: __dirname + '/umd',
-    library: 'splitio',
-    libraryTarget: 'umd',
-    libraryExport: 'default'
-  },
-  devtool: 'none',
-  module: {
-    rules: [
-      {
-        test: /\.js$/,
-        exclude: /node_modules/,
-        use: {
-          loader: 'babel-loader',
-          options: {
-            presets: [['@babel/preset-env', {
-              'useBuiltIns': false,
-              'targets': {
-                'ie': '10',
-                'node': '6'
-              },
-              'modules': false
-            }]],
-            plugins: [
-              [
-                '@babel/plugin-transform-runtime',
-                {
-                  'absoluteRuntime': false,
-                  'corejs': 3,
-                  'regenerator': true,
-                  'useESModules': false,
-                  'helpers': true,
-                }
-              ]
-            ]
-          }
-        }
-      }
-    ]
-  },
-
-  node: {
-    fs: 'empty',
-    module: 'empty',
-    console: false
-  }
-};
diff --git a/webpack.dev.js b/webpack.dev.js
deleted file mode 100644
index 31043b334..000000000
--- a/webpack.dev.js
+++ /dev/null
@@ -1,12 +0,0 @@
-const merge = require('webpack-merge');
-const common = require('./webpack.common.js');
-const pkg = require('./package.json');
-
-const VERSION = pkg.version;
-
-module.exports = merge(common, {
-  mode: 'development',
-  output: {
-    filename: `[name]-${VERSION}.js`
-  }
-});
diff --git a/webpack.prod.js b/webpack.prod.js
deleted file mode 100644
index e4ca6ee06..000000000
--- a/webpack.prod.js
+++ /dev/null
@@ -1,12 +0,0 @@
-const merge = require('webpack-merge');
-const common = require('./webpack.common.js');
-const pkg = require('./package.json');
-
-const VERSION = pkg.version;
-
-module.exports = merge(common, {
-  mode: 'production',
-  output: {
-    filename: `[name]-${VERSION}.min.js`
-  }
-});