diff --git a/CHANGELOG.md b/CHANGELOG.md
index be20d726c16f..d46ba9504fef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,12 @@
 
 ### Performance
 
+## 27.4.3
+
+### Fixes
+
+- `[jest-environment-jsdom]` Remove `@types/jsdom` dependency (and make its `dom` property `private`) ([#12107](https://github.com/facebook/jest/pull/12107))
+
 ## 27.4.2
 
 ### Fixes
diff --git a/packages/jest-environment-jsdom/package.json b/packages/jest-environment-jsdom/package.json
index 2073488b6ef7..7dc9f3f1d71f 100644
--- a/packages/jest-environment-jsdom/package.json
+++ b/packages/jest-environment-jsdom/package.json
@@ -20,14 +20,14 @@
     "@jest/environment": "^27.4.2",
     "@jest/fake-timers": "^27.4.2",
     "@jest/types": "^27.4.2",
-    "@types/jsdom": "^16.2.4",
     "@types/node": "*",
     "jest-mock": "^27.4.2",
     "jest-util": "^27.4.2",
     "jsdom": "^16.6.0"
   },
   "devDependencies": {
-    "@jest/test-utils": "^27.4.2"
+    "@jest/test-utils": "^27.4.2",
+    "@types/jsdom": "^16.2.4"
   },
   "engines": {
     "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
diff --git a/packages/jest-environment-jsdom/src/index.ts b/packages/jest-environment-jsdom/src/index.ts
index 1aab227fdb71..006f2357e83e 100644
--- a/packages/jest-environment-jsdom/src/index.ts
+++ b/packages/jest-environment-jsdom/src/index.ts
@@ -23,11 +23,11 @@ type Win = Window &
   };
 
 class JSDOMEnvironment implements JestEnvironment<number> {
-  dom: JSDOM | null;
+  private dom: JSDOM | null;
   fakeTimers: LegacyFakeTimers<number> | null;
   fakeTimersModern: ModernFakeTimers | null;
   global: Win;
-  errorEventListener: ((event: Event & {error: Error}) => void) | null;
+  private errorEventListener: ((event: Event & {error: Error}) => void) | null;
   moduleMocker: ModuleMocker | null;
 
   constructor(config: Config.ProjectConfig, options?: EnvironmentContext) {