diff --git a/package.json b/package.json
index 827b51f..524ebd0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kabbouchi/vue-web3",
-  "version": "0.2.14",
+  "version": "0.2.15",
   "description": "Vue web3 composition api",
   "license": "MIT",
   "main": "dist/cjs/index.js",
diff --git a/src/index.ts b/src/index.ts
index f51c3a7..c746e87 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,7 +1,7 @@
 import { AbstractConnector } from '@web3-react/abstract-connector'
 import { normalizeAccount, normalizeChainId } from './normalizers'
 import { ConnectorEvent, ConnectorUpdate } from '@web3-react/types'
-import { computed, onBeforeUnmount, ref, watch } from 'vue-demi'
+import { computed, onBeforeUnmount, Ref, ref, watch } from 'vue-demi'
 
 export class UnsupportedChainIdError extends Error {
   public constructor(
@@ -36,7 +36,7 @@ export const setWeb3LibraryCallback = (
   getLibrary = cb
 }
 
-export const useWeb3 = () => {
+export const useWeb3 = <TLibrary>() => {
   const onErrorCb = ref<(error: Error) => void>()
 
   const activate = async (
@@ -180,7 +180,7 @@ export const useWeb3 = () => {
   })
 
   return {
-    library,
+    library: library as Ref<TLibrary>,
     active,
     activate,
     deactivate,