diff --git a/packages/edit-post/src/editor.js b/packages/edit-post/src/editor.js
index 03620a5021b4a2..093bfce4bc3b34 100644
--- a/packages/edit-post/src/editor.js
+++ b/packages/edit-post/src/editor.js
@@ -9,7 +9,7 @@ import {
 	store as editorStore,
 	experiments as editorExperiments,
 } from '@wordpress/editor';
-import { useMemo } from '@wordpress/element';
+import { StrictMode, useMemo } from '@wordpress/element';
 import { SlotFillProvider } from '@wordpress/components';
 import { store as coreStore } from '@wordpress/core-data';
 import { ShortcutProvider } from '@wordpress/keyboard-shortcuts';
@@ -173,24 +173,28 @@ function Editor( { postId, postType, settings, initialEdits, ...props } ) {
 	}
 
 	return (
-		<ShortcutProvider>
-			<SlotFillProvider>
-				<ExperimentalEditorProvider
-					settings={ editorSettings }
-					post={ post }
-					initialEdits={ initialEdits }
-					useSubRegistry={ false }
-					__unstableTemplate={ isTemplateMode ? template : undefined }
-					{ ...props }
-				>
-					<ErrorBoundary>
-						<EditorInitialization postId={ postId } />
-						<Layout styles={ styles } />
-					</ErrorBoundary>
-					<PostLockedModal />
-				</ExperimentalEditorProvider>
-			</SlotFillProvider>
-		</ShortcutProvider>
+		<StrictMode>
+			<ShortcutProvider>
+				<SlotFillProvider>
+					<ExperimentalEditorProvider
+						settings={ editorSettings }
+						post={ post }
+						initialEdits={ initialEdits }
+						useSubRegistry={ false }
+						__unstableTemplate={
+							isTemplateMode ? template : undefined
+						}
+						{ ...props }
+					>
+						<ErrorBoundary>
+							<EditorInitialization postId={ postId } />
+							<Layout styles={ styles } />
+						</ErrorBoundary>
+						<PostLockedModal />
+					</ExperimentalEditorProvider>
+				</SlotFillProvider>
+			</ShortcutProvider>
+		</StrictMode>
 	);
 }
 
diff --git a/packages/edit-site/src/components/app/index.js b/packages/edit-site/src/components/app/index.js
index 479aebf0d5361e..7f355aee2a39e5 100644
--- a/packages/edit-site/src/components/app/index.js
+++ b/packages/edit-site/src/components/app/index.js
@@ -3,6 +3,7 @@
  */
 import { SlotFillProvider, Popover } from '@wordpress/components';
 import { UnsavedChangesWarning } from '@wordpress/editor';
+import { StrictMode } from '@wordpress/element';
 import { ShortcutProvider } from '@wordpress/keyboard-shortcuts';
 import { store as noticesStore } from '@wordpress/notices';
 import { useDispatch } from '@wordpress/data';
@@ -31,16 +32,17 @@ export default function App() {
 	}
 
 	return (
-		<ShortcutProvider style={ { height: '100%' } }>
-			<SlotFillProvider>
-				<Popover.Slot />
-				<UnsavedChangesWarning />
-
-				<Routes>
-					<Layout />
-					<PluginArea onError={ onPluginAreaError } />
-				</Routes>
-			</SlotFillProvider>
-		</ShortcutProvider>
+		<StrictMode>
+			<ShortcutProvider style={ { height: '100%' } }>
+				<SlotFillProvider>
+					<Popover.Slot />
+					<UnsavedChangesWarning />
+					<Routes>
+						<Layout />
+						<PluginArea onError={ onPluginAreaError } />
+					</Routes>
+				</SlotFillProvider>
+			</ShortcutProvider>
+		</StrictMode>
 	);
 }
diff --git a/packages/edit-widgets/src/components/widget-areas-block-editor-provider/index.js b/packages/edit-widgets/src/components/widget-areas-block-editor-provider/index.js
index 917899d7dd99be..988e558db80a1f 100644
--- a/packages/edit-widgets/src/components/widget-areas-block-editor-provider/index.js
+++ b/packages/edit-widgets/src/components/widget-areas-block-editor-provider/index.js
@@ -9,7 +9,7 @@ import {
 	store as coreStore,
 	useResourcePermissions,
 } from '@wordpress/core-data';
-import { useMemo } from '@wordpress/element';
+import { StrictMode, useMemo } from '@wordpress/element';
 import {
 	BlockEditorKeyboardShortcuts,
 	CopyHandler,
@@ -99,22 +99,26 @@ export default function WidgetAreasBlockEditorProvider( {
 	);
 
 	return (
-		<ShortcutProvider>
-			<BlockEditorKeyboardShortcuts.Register />
-			<KeyboardShortcuts.Register />
-			<SlotFillProvider>
-				<ExperimentalBlockEditorProvider
-					value={ blocks }
-					onInput={ onInput }
-					onChange={ onChange }
-					settings={ settings }
-					useSubRegistry={ false }
-					{ ...props }
-				>
-					<CopyHandler>{ children }</CopyHandler>
-					<ReusableBlocksMenuItems rootClientId={ widgetAreaId } />
-				</ExperimentalBlockEditorProvider>
-			</SlotFillProvider>
-		</ShortcutProvider>
+		<StrictMode>
+			<ShortcutProvider>
+				<BlockEditorKeyboardShortcuts.Register />
+				<KeyboardShortcuts.Register />
+				<SlotFillProvider>
+					<ExperimentalBlockEditorProvider
+						value={ blocks }
+						onInput={ onInput }
+						onChange={ onChange }
+						settings={ settings }
+						useSubRegistry={ false }
+						{ ...props }
+					>
+						<CopyHandler>{ children }</CopyHandler>
+						<ReusableBlocksMenuItems
+							rootClientId={ widgetAreaId }
+						/>
+					</ExperimentalBlockEditorProvider>
+				</SlotFillProvider>
+			</ShortcutProvider>
+		</StrictMode>
 	);
 }