diff --git a/package.json b/package.json
index 424809d..c40142e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "reto",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "main": "index.js",
   "repository": "https://github.com/awmleer/reto",
   "description": "React store with hooks.",
@@ -37,6 +37,5 @@
     "typescript": "^3.4.5"
   },
   "dependencies": {
-    "reflect-metadata": "^0.1.12"
   }
 }
diff --git a/rollup.config.js b/rollup.config.js
index c5d7353..b6f4051 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,7 +1,6 @@
 module.exports = {
   external: [
     'react',
-    'reflect-metadata',
   ],
   input: 'lib/index.js',
   output: {
diff --git a/src/consumer.tsx b/src/consumer.tsx
index cccf072..e7df19a 100644
--- a/src/consumer.tsx
+++ b/src/consumer.tsx
@@ -1,6 +1,7 @@
 import * as React from 'react'
 import {ReactNode, useContext, useDebugValue} from 'react'
 import {ReactElement} from 'react'
+import {contextMap} from './shared-map'
 import {Store} from './store'
 import {contextSymbol} from './symbols'
 
@@ -15,7 +16,7 @@ export function Consumer<T>(props: Props<T>) {
 }
 
 export function useStore<T>(S: Store<T>, optional?: boolean) {
-  const Context = Reflect.getMetadata(contextSymbol, S)
+  const Context = contextMap.get(S) // Reflect.getMetadata(contextSymbol, S)
   if (!Context) {
     if (!optional) {
       console.error(`No store context of "${S.name}" found. Did you provide it?`)
diff --git a/src/index.ts b/src/index.ts
index 75b29eb..bf23366 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,3 @@
-import 'reflect-metadata'
-
 export {useStore, Consumer} from './consumer'
 export {Provider, ProviderProps, withProvider} from './provider'
 export {Store} from './store'
diff --git a/src/provider.tsx b/src/provider.tsx
index fdcf536..991c606 100644
--- a/src/provider.tsx
+++ b/src/provider.tsx
@@ -1,6 +1,7 @@
 import * as React from 'react'
 import {forwardRef, MutableRefObject, ReactNode, useCallback, useRef, useState} from 'react'
 import {MemoChildren} from './memo-children'
+import {contextMap} from './shared-map'
 import {StateBox} from './state-box'
 import {Store} from './store'
 import {contextSymbol} from './symbols'
@@ -28,10 +29,10 @@ export const Provider = forwardRef(function Provider<T>(props: Props<T>, ref: Mu
     updateRef.current = true
   }
 
-  let Context = Reflect.getMetadata(contextSymbol, props.of)
+  let Context = contextMap.get(props.of) //Reflect.getMetadata(contextSymbol, props.of)
   if (!Context) {
     Context = React.createContext(null)
-    Reflect.defineMetadata(contextSymbol, Context, props.of)
+    contextMap.set(props.of, Context) //Reflect.defineMetadata(contextSymbol, Context, props.of)
   }
 
   const onReactorChange = useCallback(function(value) {
diff --git a/src/shared-map.ts b/src/shared-map.ts
new file mode 100644
index 0000000..2dcf277
--- /dev/null
+++ b/src/shared-map.ts
@@ -0,0 +1,4 @@
+import {Context} from 'react'
+import {Store} from './store'
+
+export const contextMap = new Map<Store<any>, Context<any>>()
diff --git a/yarn.lock b/yarn.lock
index c5b9812..feccddd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4067,11 +4067,6 @@ redent@^3.0.0:
     indent-string "^4.0.0"
     strip-indent "^3.0.0"
 
-reflect-metadata@^0.1.12:
-  version "0.1.13"
-  resolved "https://registry.npm.taobao.org/reflect-metadata/download/reflect-metadata-0.1.13.tgz#67ae3ca57c972a2aa1642b10fe363fe32d49dc08"
-  integrity sha1-Z648pXyXKiqhZCsQ/jY/4y1J3Ag=
-
 regenerator-runtime@^0.13.2:
   version "0.13.3"
   resolved "https://registry.npm.taobao.org/regenerator-runtime/download/regenerator-runtime-0.13.3.tgz#7cf6a77d8f5c6f60eb73c5fc1955b2ceb01e6bf5"