diff --git a/packages/desktop-gui/package.json b/packages/desktop-gui/package.json
index b860d2887d..272959c8c2 100644
--- a/packages/desktop-gui/package.json
+++ b/packages/desktop-gui/package.json
@@ -62,6 +62,6 @@
     "react-dom": "^15.1.0",
     "react-loader": "^2.4.0",
     "react-router": "^2.4.1",
-    "zunder": "3.5.8"
+    "zunder": "4.1.0"
   }
 }
diff --git a/packages/desktop-gui/scripts/build-prod.js b/packages/desktop-gui/scripts/build-prod.js
index 8208fd6956..1fc82c33a7 100644
--- a/packages/desktop-gui/scripts/build-prod.js
+++ b/packages/desktop-gui/scripts/build-prod.js
@@ -1,7 +1,7 @@
-var z = require('zunder')
-var u = z.undertaker
-var copyScripts = require('./copy-scripts')
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const copyScripts = require('./copy-scripts')
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/desktop-gui/scripts/copy-scripts.js b/packages/desktop-gui/scripts/copy-scripts.js
index 353c1c9cbd..e319109712 100644
--- a/packages/desktop-gui/scripts/copy-scripts.js
+++ b/packages/desktop-gui/scripts/copy-scripts.js
@@ -1,14 +1,14 @@
-var gulp = require("gulp")
-var concat = require('gulp-concat')
+const gulp = require('gulp')
+const concat = require('gulp-concat')
 
 module.exports = function copyScripts (dir) {
   return function () {
     return gulp.src([
-      "node_modules/jquery/dist/jquery.js",
-      "node_modules/bootstrap-sass/assets/javascripts/bootstrap/dropdown.js",
-      "node_modules/bootstrap-sass/assets/javascripts/bootstrap/alert.js",
+      'node_modules/jquery/dist/jquery.js',
+      'node_modules/bootstrap-sass/assets/javascripts/bootstrap/dropdown.js',
+      'node_modules/bootstrap-sass/assets/javascripts/bootstrap/alert.js',
     ])
     .pipe(concat('vendor.js'))
     .pipe(gulp.dest(dir))
   }
-}
\ No newline at end of file
+}
diff --git a/packages/desktop-gui/zunderfile.js b/packages/desktop-gui/zunderfile.js
index 5e5ea394f0..e7daa9b08a 100644
--- a/packages/desktop-gui/zunderfile.js
+++ b/packages/desktop-gui/zunderfile.js
@@ -1,8 +1,8 @@
-var zunder = require("zunder")
-var copyScripts = require('./scripts/copy-scripts')
-var setZunderConfig = require('./scripts/set-zunder-config')
+const zunder = require('zunder')
+const copyScripts = require('./scripts/copy-scripts')
+const setZunderConfig = require('./scripts/set-zunder-config')
 
 setZunderConfig(zunder)
 
-zunder.on("before:watch", copyScripts(zunder.config.devDir))
-zunder.on("before:build-dev", copyScripts(zunder.config.devDir))
+zunder.on('before:watch', copyScripts(zunder.config.devDir))
+zunder.on('before:build-dev', copyScripts(zunder.config.devDir))
diff --git a/packages/reporter/package.json b/packages/reporter/package.json
index 756682ca44..053ce5b584 100644
--- a/packages/reporter/package.json
+++ b/packages/reporter/package.json
@@ -56,6 +56,6 @@
     "react-test-renderer": "^15.5.4",
     "sinon": "^1.17.4",
     "sinon-chai": "^2.8.0",
-    "zunder": "4.0.4"
+    "zunder": "4.1.0"
   }
 }
diff --git a/packages/reporter/scripts/build-dev.js b/packages/reporter/scripts/build-dev.js
index 40e87fb2fc..6456328a90 100644
--- a/packages/reporter/scripts/build-dev.js
+++ b/packages/reporter/scripts/build-dev.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/reporter/scripts/build-prod.js b/packages/reporter/scripts/build-prod.js
index 80083e5378..4569786a84 100644
--- a/packages/reporter/scripts/build-prod.js
+++ b/packages/reporter/scripts/build-prod.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/reporter/scripts/set-zunder-config.js b/packages/reporter/scripts/set-zunder-config.js
index dc574a7e71..f86072389e 100644
--- a/packages/reporter/scripts/set-zunder-config.js
+++ b/packages/reporter/scripts/set-zunder-config.js
@@ -1,5 +1,5 @@
 module.exports = function setZunderConfig (zunder) {
-  var commonScripts = ['@cypress/react-tooltip', 'react', 'react-dom', 'mobx', 'mobx-react', 'lodash']
+  const commonScripts = ['@cypress/react-tooltip', 'react', 'react-dom', 'mobx', 'mobx-react', 'lodash']
 
   zunder.setConfig({
     cacheBust: false,
@@ -7,7 +7,7 @@ module.exports = function setZunderConfig (zunder) {
       {
         scriptName: 'common.js',
         libs: commonScripts.map((file) => ({ file })),
-      }
+      },
     ],
     prodDir: 'dist',
     resolutions: commonScripts,
diff --git a/packages/reporter/scripts/test.js b/packages/reporter/scripts/test.js
index 0b99216ed5..9fbd6d2ee3 100644
--- a/packages/reporter/scripts/test.js
+++ b/packages/reporter/scripts/test.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/reporter/scripts/watch.js b/packages/reporter/scripts/watch.js
index bd29bfd558..c54f59750a 100644
--- a/packages/reporter/scripts/watch.js
+++ b/packages/reporter/scripts/watch.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/runner/package.json b/packages/runner/package.json
index 5b06c1ed84..8a75681ccd 100644
--- a/packages/runner/package.json
+++ b/packages/runner/package.json
@@ -48,6 +48,6 @@
     "react-test-renderer": "^15.5.4",
     "sinon": "^1.17.5",
     "sinon-chai": "^2.8.0",
-    "zunder": "^3.5.5"
+    "zunder": "4.1.0"
   }
 }
diff --git a/packages/runner/scripts/build-dev.js b/packages/runner/scripts/build-dev.js
index 0f98df4b79..eb726d9297 100644
--- a/packages/runner/scripts/build-dev.js
+++ b/packages/runner/scripts/build-dev.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/runner/scripts/build-prod.js b/packages/runner/scripts/build-prod.js
index 49b8dc7166..a611e66e38 100644
--- a/packages/runner/scripts/build-prod.js
+++ b/packages/runner/scripts/build-prod.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/runner/scripts/test.js b/packages/runner/scripts/test.js
index 0b99216ed5..9fbd6d2ee3 100644
--- a/packages/runner/scripts/test.js
+++ b/packages/runner/scripts/test.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)
 
diff --git a/packages/runner/scripts/watch.js b/packages/runner/scripts/watch.js
index 5c0de8261a..48f511af4c 100644
--- a/packages/runner/scripts/watch.js
+++ b/packages/runner/scripts/watch.js
@@ -1,6 +1,6 @@
-var z = require('zunder')
-var u = z.undertaker
-var setZunderConfig = require('./set-zunder-config')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
 
 setZunderConfig(z)