diff --git a/extension/src/app/api/index.ts b/extension/src/app/api/index.ts
index 08b036a2..aeda37dc 100644
--- a/extension/src/app/api/index.ts
+++ b/extension/src/app/api/index.ts
@@ -695,25 +695,6 @@ export function connect(preConfig: Config): ConnectResponse {
   };
 }
 
-export function updateStore<S, A extends Action<unknown>>(stores: {
-  [K in string | number]: EnhancedStore<S, A, unknown>;
-}) {
-  return function (newStore: EnhancedStore<S, A, unknown>, instanceId: number) {
-    /* eslint-disable no-console */
-    console.warn(
-      '`__REDUX_DEVTOOLS_EXTENSION__.updateStore` is deprecated, remove it and just use ' +
-        "`__REDUX_DEVTOOLS_EXTENSION_COMPOSE__` instead of the extension's store enhancer: " +
-        'https://github.com/zalmoxisus/redux-devtools-extension#12-advanced-store-setup'
-    );
-    /* eslint-enable no-console */
-    const store = stores[instanceId || Object.keys(stores)[0]];
-    // Mutate the store in order to keep the reference
-    store.liftedStore = newStore.liftedStore;
-    store.getState = newStore.getState;
-    store.dispatch = newStore.dispatch;
-  };
-}
-
 export function isInIframe() {
   try {
     return window.self !== window.top;
diff --git a/extension/src/browser/extension/inject/pageScript.ts b/extension/src/browser/extension/inject/pageScript.ts
index 287c5973..b23fa46d 100644
--- a/extension/src/browser/extension/inject/pageScript.ts
+++ b/extension/src/browser/extension/inject/pageScript.ts
@@ -29,7 +29,6 @@ import importState from '../../../app/api/importState';
 import openWindow, { Position } from '../../../app/api/openWindow';
 import generateId from '../../../app/api/generateInstanceId';
 import {
-  updateStore,
   toContentScript,
   sendMessage,
   setListener,
@@ -133,10 +132,6 @@ export interface Config extends ConfigWithExpandedMaxAge {
 interface ReduxDevtoolsExtension {
   (config?: Config): StoreEnhancer;
   open: (position?: Position) => void;
-  updateStore: (
-    newStore: EnhancedStore<unknown, Action<unknown>, unknown>,
-    instanceId: number
-  ) => void;
   notifyErrors: (onError?: () => boolean) => void;
   send: <S, A extends Action<unknown>>(
     action: StructuralPerformAction<A> | StructuralPerformAction<A>[],
@@ -564,7 +559,6 @@ declare global {
 // noinspection JSAnnotator
 window.__REDUX_DEVTOOLS_EXTENSION__ = __REDUX_DEVTOOLS_EXTENSION__ as any;
 window.__REDUX_DEVTOOLS_EXTENSION__.open = openWindow;
-window.__REDUX_DEVTOOLS_EXTENSION__.updateStore = updateStore(stores);
 window.__REDUX_DEVTOOLS_EXTENSION__.notifyErrors = notifyErrors;
 window.__REDUX_DEVTOOLS_EXTENSION__.send = sendMessage;
 window.__REDUX_DEVTOOLS_EXTENSION__.listen = setListener;