diff --git a/packages/redux-devtools-instrument/test/instrument.spec.ts b/packages/redux-devtools-instrument/test/instrument.spec.ts
index 93ab1740..b7667f57 100644
--- a/packages/redux-devtools-instrument/test/instrument.spec.ts
+++ b/packages/redux-devtools-instrument/test/instrument.spec.ts
@@ -1141,6 +1141,8 @@ describe('instrument', () => {
       const importMonitoredLiftedStore = importMonitoredStore.liftedStore;
 
       const noComputedExportedState = Object.assign({}, exportedState);
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       delete noComputedExportedState.computedStates;
 
       importMonitoredLiftedStore.dispatch(
@@ -1184,6 +1186,8 @@ describe('instrument', () => {
     state: LiftedState<S, A, null>
   ) {
     state.actionsById = _.mapValues(state.actionsById, (action) => {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       delete action.timestamp;
       delete action.stack;
       return action;
diff --git a/packages/redux-devtools/test/persistState.spec.ts b/packages/redux-devtools/test/persistState.spec.ts
index 6b6e3cb7..76c5e3b4 100644
--- a/packages/redux-devtools/test/persistState.spec.ts
+++ b/packages/redux-devtools/test/persistState.spec.ts
@@ -3,7 +3,6 @@ import { compose, createStore } from 'redux';
 
 describe('persistState', () => {
   const savedLocalStorage = global.localStorage;
-  delete global.localStorage;
 
   beforeEach(() => {
     global.localStorage = {
@@ -119,7 +118,9 @@ describe('persistState', () => {
     const spy = jest.spyOn(console, 'warn').mockImplementation(() => {
       // noop
     });
-    delete global.localStorage.getItem;
+    global.localStorage.getItem = () => {
+      throw new Error();
+    };
     createStore(reducer, compose(instrument(), persistState('id')));
 
     expect(spy.mock.calls[0]).toContain(
@@ -133,7 +134,9 @@ describe('persistState', () => {
     const spy = jest.spyOn(console, 'warn').mockImplementation(() => {
       // noop
     });
-    delete global.localStorage.setItem;
+    global.localStorage.setItem = () => {
+      throw new Error();
+    };
     const store = createStore(
       reducer,
       compose(instrument(), persistState('id'))