diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee18e92..0863125 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Change Log
 
 ## [Unreleased]
+### Changed
+- fix(isolation): fix prop types #15
 
 ## [0.5.0] - 2024-01-26
 ### Changed
diff --git a/examples/01_isolation/src/App.tsx b/examples/01_isolation/src/App.tsx
index 67b83cb..8fc03e8 100644
--- a/examples/01_isolation/src/App.tsx
+++ b/examples/01_isolation/src/App.tsx
@@ -17,7 +17,7 @@ const Counter = () => {
   );
 };
 
-const ScopedCounter = () => {
+const MyCounter = () => {
   const [count, setCount] = useMyAtom(countAtom);
   return (
     <div>
@@ -35,12 +35,12 @@ const App = () => {
       <h1>First Provider</h1>
       <MyProvider>
         <Counter />
-        <ScopedCounter />
+        <MyCounter />
       </MyProvider>
       <h1>Second Provider</h1>
-      <MyProvider>
+      <MyProvider initialValues={[[countAtom, 1]]}>
         <Counter />
-        <ScopedCounter />
+        <MyCounter />
       </MyProvider>
     </div>
   );
diff --git a/src/createIsolation.tsx b/src/createIsolation.tsx
index f3a0024..a4c677c 100644
--- a/src/createIsolation.tsx
+++ b/src/createIsolation.tsx
@@ -1,6 +1,7 @@
 import { createContext, useContext, useRef } from 'react';
 import type { ReactNode } from 'react';
 import { createStore } from 'jotai/vanilla';
+import type { WritableAtom } from 'jotai/vanilla';
 import {
   useAtom as useAtomOrig,
   useAtomValue as useAtomValueOrig,
@@ -9,25 +10,25 @@ import {
 import { useHydrateAtoms } from 'jotai/react/utils';
 
 type Store = ReturnType<typeof createStore>;
-type InitialValues = Parameters<typeof useHydrateAtoms>[0];
+type AnyWritableAtom = WritableAtom<unknown, any[], any>;
 
 export function createIsolation() {
   const StoreContext = createContext<Store | null>(null);
 
   const Provider = ({
     store,
-    initialValues = [] as unknown as InitialValues,
+    initialValues = [],
     children,
   }: {
     store?: Store;
-    initialValues?: InitialValues;
+    initialValues?: Iterable<readonly [AnyWritableAtom, unknown]>;
     children: ReactNode;
   }) => {
     const storeRef = useRef(store);
     if (!storeRef.current) {
       storeRef.current = createStore();
     }
-    useHydrateAtoms(initialValues, { store: storeRef.current });
+    useHydrateAtoms(initialValues as any, { store: storeRef.current });
     return (
       <StoreContext.Provider value={storeRef.current}>
         {children}