diff --git a/packages/customize-widgets/src/index.js b/packages/customize-widgets/src/index.js
index 9afda775a1701c..5de010fa8bd37e 100644
--- a/packages/customize-widgets/src/index.js
+++ b/packages/customize-widgets/src/index.js
@@ -1,7 +1,7 @@
 /**
  * WordPress dependencies
  */
-import { createRoot } from '@wordpress/element';
+import { createRoot, StrictMode } from '@wordpress/element';
 import {
 	registerCoreBlocks,
 	__experimentalGetCoreBlocks,
@@ -92,11 +92,13 @@ export function initialize( editorName, blockEditorSettings ) {
 		} );
 
 		createRoot( container ).render(
-			<CustomizeWidgets
-				api={ wp.customize }
-				sidebarControls={ sidebarControls }
-				blockEditorSettings={ blockEditorSettings }
-			/>
+			<StrictMode>
+				<CustomizeWidgets
+					api={ wp.customize }
+					sidebarControls={ sidebarControls }
+					blockEditorSettings={ blockEditorSettings }
+				/>
+			</StrictMode>
 		);
 	} );
 }
diff --git a/packages/edit-post/src/index.js b/packages/edit-post/src/index.js
index 0ec4388a9af70e..e7600831f11bae 100644
--- a/packages/edit-post/src/index.js
+++ b/packages/edit-post/src/index.js
@@ -7,7 +7,7 @@ import {
 	__experimentalRegisterExperimentalCoreBlocks,
 } from '@wordpress/block-library';
 import deprecated from '@wordpress/deprecated';
-import { createRoot } from '@wordpress/element';
+import { createRoot, StrictMode } from '@wordpress/element';
 import { dispatch, select } from '@wordpress/data';
 import { store as preferencesStore } from '@wordpress/preferences';
 import {
@@ -137,12 +137,14 @@ export function initializeEditor(
 	window.addEventListener( 'drop', ( e ) => e.preventDefault(), false );
 
 	root.render(
-		<Editor
-			settings={ settings }
-			postId={ postId }
-			postType={ postType }
-			initialEdits={ initialEdits }
-		/>
+		<StrictMode>
+			<Editor
+				settings={ settings }
+				postId={ postId }
+				postType={ postType }
+				initialEdits={ initialEdits }
+			/>
+		</StrictMode>
 	);
 
 	return root;
diff --git a/packages/edit-site/src/index.js b/packages/edit-site/src/index.js
index 41fc0a1985fded..f7ef09f81ce7e7 100644
--- a/packages/edit-site/src/index.js
+++ b/packages/edit-site/src/index.js
@@ -9,7 +9,7 @@ import {
 } from '@wordpress/block-library';
 import { dispatch } from '@wordpress/data';
 import deprecated from '@wordpress/deprecated';
-import { createRoot } from '@wordpress/element';
+import { createRoot, StrictMode } from '@wordpress/element';
 import { store as editorStore } from '@wordpress/editor';
 import { store as preferencesStore } from '@wordpress/preferences';
 import {
@@ -85,7 +85,11 @@ export function initializeEditor( id, settings ) {
 	window.addEventListener( 'dragover', ( e ) => e.preventDefault(), false );
 	window.addEventListener( 'drop', ( e ) => e.preventDefault(), false );
 
-	root.render( <App /> );
+	root.render(
+		<StrictMode>
+			<App />
+		</StrictMode>
+	);
 
 	return root;
 }
diff --git a/packages/edit-widgets/src/index.js b/packages/edit-widgets/src/index.js
index 2374ec19dabd7b..f8247d733f1a15 100644
--- a/packages/edit-widgets/src/index.js
+++ b/packages/edit-widgets/src/index.js
@@ -9,7 +9,7 @@ import {
 } from '@wordpress/blocks';
 import { dispatch } from '@wordpress/data';
 import deprecated from '@wordpress/deprecated';
-import { createRoot } from '@wordpress/element';
+import { StrictMode, createRoot } from '@wordpress/element';
 import {
 	registerCoreBlocks,
 	__experimentalGetCoreBlocks,
@@ -91,7 +91,11 @@ export function initializeEditor( id, settings ) {
 	// see: https://github.com/WordPress/gutenberg/issues/33097
 	setFreeformContentHandlerName( 'core/html' );
 
-	root.render( <Layout blockEditorSettings={ settings } /> );
+	root.render(
+		<StrictMode>
+			<Layout blockEditorSettings={ settings } />
+		</StrictMode>
+	);
 
 	return root;
 }
diff --git a/packages/list-reusable-blocks/src/index.js b/packages/list-reusable-blocks/src/index.js
index 4440ba1c49f05a..f5cb411726963c 100644
--- a/packages/list-reusable-blocks/src/index.js
+++ b/packages/list-reusable-blocks/src/index.js
@@ -1,7 +1,7 @@
 /**
  * WordPress dependencies
  */
-import { createRoot } from '@wordpress/element';
+import { createRoot, StrictMode } from '@wordpress/element';
 import { __ } from '@wordpress/i18n';
 
 /**
@@ -44,6 +44,8 @@ document.addEventListener( 'DOMContentLoaded', () => {
 	container.className = 'list-reusable-blocks__container';
 	button.parentNode.insertBefore( container, button );
 	createRoot( container ).render(
-		<ImportDropdown onUpload={ showNotice } />
+		<StrictMode>
+			<ImportDropdown onUpload={ showNotice } />
+		</StrictMode>
 	);
 } );