diff --git a/types/react-intl-redux/index.d.ts b/types/react-intl-redux/index.d.ts
index 4410e7c019..ae7772ad78 100644
--- a/types/react-intl-redux/index.d.ts
+++ b/types/react-intl-redux/index.d.ts
@@ -17,7 +17,7 @@ interface IntlAction extends Action {
     payload?: IntlState
 }
 
-export function intlReducer(state: IntlState, action: IntlAction): IntlState
+export function intlReducer(state: IntlState | undefined, action: IntlAction): IntlState
 export function updateIntl (opts: IntlState): IntlAction
 export class IntlProvider extends ReactIntlProvider {}
 export class Provider<A extends Action = AnyAction> extends ReduxProvider<A> {}
diff --git a/types/react-intl-redux/package.json b/types/react-intl-redux/package.json
index 6d68bf2f9b..7f5b19d45b 100644
--- a/types/react-intl-redux/package.json
+++ b/types/react-intl-redux/package.json
@@ -1,6 +1,6 @@
 {
     "private": true,
     "dependencies": {
-        "redux": "^3.6.0"
+        "redux": "^4.0.0"
     }
 }