diff --git a/package.json b/package.json
index e831adf..238a1d5 100644
--- a/package.json
+++ b/package.json
@@ -61,10 +61,10 @@
     "@commitlint/cli": "^11.0.0",
     "@commitlint/config-conventional": "^11.0.0",
     "@testing-library/jest-dom": "^5.0.2",
-    "@types/jest": "^26.0.0",
+    "@types/jest": "^27.0.0",
     "all-contributors-cli": "^6.9.0",
     "babel-eslint": "^10.0.3",
-    "babel-jest": "^26.0.1",
+    "babel-jest": "^27.0.0",
     "doctoc": "^2.0.0",
     "eslint": "^7.2.0",
     "eslint-config-standard": "^16.0.0",
@@ -74,12 +74,12 @@
     "eslint-plugin-simple-import-sort": "^7.0.0",
     "eslint-plugin-svelte3": "^3.0.0",
     "husky": "^4.0.9",
-    "jest": "^26.0.1",
+    "jest": "^27.0.0",
     "lint-staged": "^10.0.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^2.0.1",
     "svelte": "^3.0.0",
-    "svelte-jester": "^1.0.3"
+    "svelte-jester": "^2.1.4"
   },
   "husky": {
     "hooks": {
@@ -118,6 +118,7 @@
     "setupFilesAfterEnv": [
       "@testing-library/jest-dom/extend-expect"
     ],
+    "testEnvironment": "jsdom",
     "transform": {
       "^.+\\.js$": "babel-jest",
       "^.+\\.svelte$": "svelte-jester",
diff --git a/src/__tests__/multi-base.test.js b/src/__tests__/multi-base.test.js
index ec9307c..a928fe4 100644
--- a/src/__tests__/multi-base.test.js
+++ b/src/__tests__/multi-base.test.js
@@ -2,20 +2,8 @@ import { render } from '..'
 import Comp from './fixtures/Comp'
 
 describe('multi-base', () => {
-  let treeA
-  let treeB
-
-  beforeAll(() => {
-    treeA = document.createElement('div')
-    treeB = document.createElement('div')
-    document.body.appendChild(treeA)
-    document.body.appendChild(treeB)
-  })
-
-  afterAll(() => {
-    treeA.parentNode.removeChild(treeA)
-    treeB.parentNode.removeChild(treeB)
-  })
+  const treeA = document.createElement('div')
+  const treeB = document.createElement('div')
 
   test('container isolates trees from one another', () => {
     const { getByText: getByTextInA } = render(Comp, {