diff --git a/package-lock.json b/package-lock.json
index 9723603..a04f31c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,12 +18,6 @@
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@@ -68,9 +62,9 @@
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-      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.107.tgz",
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+      "version": "4.14.109",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.109.tgz",
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@@ -668,30 +662,30 @@
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-      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.0.tgz",
-      "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
+      "version": "6.26.3",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.3.tgz",
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-        "private": "0.1.8",
-        "slash": "1.0.0",
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+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
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+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.8",
+        "slash": "^1.0.0",
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-        "jsesc": "1.3.0",
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+        "babel-types": "^6.26.0",
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+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
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-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-explode-assignable-expression": "^6.24.1",
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-        "babel-types": "6.26.0",
-        "lodash": "4.17.5"
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+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
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-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-bindify-decorators": "^6.24.1",
+        "babel-runtime": "^6.22.0",
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-        "babel-template": "6.26.0",
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+        "babel-helper-get-function-arity": "^6.24.1",
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+        "babel-template": "^6.24.1",
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@@ -806,8 +800,8 @@
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@@ -826,8 +820,8 @@
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@@ -836,9 +830,9 @@
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+        "babel-types": "^6.26.0",
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@@ -847,11 +841,11 @@
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-        "babel-types": "6.26.0"
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@@ -860,12 +854,12 @@
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@@ -874,8 +868,8 @@
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@@ -884,7 +878,7 @@
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       "dev": true,
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@@ -956,9 +950,9 @@
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-        "babel-runtime": "6.26.0"
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-        "babel-runtime": "6.26.0"
+        "babel-helper-remap-async-to-generator": "^6.24.1",
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-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
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     "timeago.js": {
@@ -10746,12 +10826,12 @@
       "integrity": "sha1-JaZ/LG4lOyypQZd7XvdELvl6YEY="
     },
     "tmp": {
-      "version": "0.0.31",
-      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.31.tgz",
-      "integrity": "sha1-jzirlDjhcxXl29izZX6L+yd65Kc=",
+      "version": "0.0.28",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.28.tgz",
+      "integrity": "sha1-Fyc1t/YU6nrzlmT6hM8N5OUV0SA=",
       "dev": true,
       "requires": {
-        "os-tmpdir": "1.0.2"
+        "os-tmpdir": "~1.0.1"
       }
     },
     "to-arraybuffer": {
@@ -10846,7 +10926,7 @@
       "integrity": "sha1-QFkjkJWS1W94pYGENLC3hInKXys=",
       "dev": true,
       "requires": {
-        "utf8-byte-length": "1.0.4"
+        "utf8-byte-length": "^1.0.1"
       }
     },
     "tryer": {
@@ -10915,9 +10995,9 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
     "typescript": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.8.1.tgz",
-      "integrity": "sha512-Ao/f6d/4EPLq0YwzsQz8iXflezpTkQzqAyenTiw4kCUGr1uPiFLC3+fZ+gMZz6eeI/qdRUqvC+HxIJzUAzEFdg==",
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.9.1.tgz",
+      "integrity": "sha512-h6pM2f/GDchCFlldnriOhs1QHuwbnmj6/v7499eMHqPeW4V2G0elua2eIc2nu8v2NdHV0Gm+tzX83Hr6nUFjQA==",
       "dev": true
     },
     "ua-parser-js": {
@@ -11169,8 +11249,8 @@
       "integrity": "sha512-4AoH4pxuSvHCjqLO04sU6U/uE65BYza8l/KKBS0b0hnUPWi+cQ2BpeTEwejCSx9SPV5/U03nniDTrWx5NrmKdw==",
       "dev": true,
       "requires": {
-        "lru-cache": "4.1.1",
-        "tmp": "0.0.31"
+        "lru-cache": "4.1.x",
+        "tmp": "0.0.x"
       }
     },
     "utf8-byte-length": {
@@ -11435,9 +11515,9 @@
       "integrity": "sha1-ILch3wWzW3Bhdv+hCwkJq6RgMDU=",
       "dev": true,
       "requires": {
-        "pify": "2.3.0",
-        "pinkie-promise": "1.0.0",
-        "which": "1.3.0"
+        "pify": "^2.2.0",
+        "pinkie-promise": "^1.0.0",
+        "which": "^1.1.2"
       },
       "dependencies": {
         "pify": {
@@ -11458,7 +11538,7 @@
           "integrity": "sha1-0dpn9UglY7t89X8oauKCLs+/NnA=",
           "dev": true,
           "requires": {
-            "pinkie": "1.0.0"
+            "pinkie": "^1.0.0"
           }
         }
       }
diff --git a/package.json b/package.json
index 9c0afeb..3711cc6 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,7 @@
     "eslint-plugin-html": "^4.0.3",
     "now": "^11.2.1",
     "standard": "^11.0.1",
-    "testcafe": "0.19.1"
+    "testcafe": "0.20.3"
   },
   "engines": {
     "node": ">= 8"
diff --git a/tests/spec/020-themes.js b/tests/spec/020-themes.js
index 46bca07..f321a67 100644
--- a/tests/spec/020-themes.js
+++ b/tests/spec/020-themes.js
@@ -1,4 +1,5 @@
 import {
+  getBodyClassList,
   settingsNavButton
 } from '../utils'
 import { loginAsFoobar } from '../roles'
@@ -13,9 +14,9 @@ test('can set a theme', async t => {
     .click(settingsNavButton)
     .click($('a[href="/settings/instances"]'))
     .click($('a[href="/settings/instances/localhost:3000"]'))
-    .expect($('body').getAttribute('class')).eql(undefined)
+    .expect(getBodyClassList()).eql([])
     .click($('input[value="scarlet"]'))
-    .expect($('body').getAttribute('class')).eql('theme-scarlet')
+    .expect(getBodyClassList()).eql(['theme-scarlet'])
     .click($('input[value="default"]'))
-    .expect($('body').getAttribute('class')).eql('')
+    .expect(getBodyClassList()).eql([])
 })
diff --git a/tests/utils.js b/tests/utils.js
index e8e8629..37b842f 100644
--- a/tests/utils.js
+++ b/tests/utils.js
@@ -86,6 +86,8 @@ export const getComposeSelectionStart = exec(() => composeInput().selectionStart
   dependencies: { composeInput }
 })
 
+export const getBodyClassList = exec(() => Array.prototype.slice.apply(document.body.classList))
+
 export const scrollContainerToTop = exec(() => {
   document.getElementsByClassName('container')[0].scrollTop = 0
 })