diff --git a/package-lock.json b/package-lock.json
index 81b9503a..4eadfce0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,7 +24,7 @@
         "husky": "9.1.7",
         "jest": "29.7.0",
         "jest-environment-jsdom": "29.7.0",
-        "pinia": "2.2.2",
+        "pinia": "2.3.0",
         "prettier": "3.4.2",
         "rimraf": "6.0.1",
         "size-limit": "11.1.6",
@@ -35,7 +35,7 @@
         "vue": "3.5.13"
       },
       "peerDependencies": {
-        "pinia": "^2.2.2"
+        "pinia": "^2.3.0"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -8768,9 +8768,9 @@
       }
     },
     "node_modules/pinia": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/pinia/-/pinia-2.2.2.tgz",
-      "integrity": "sha512-ja2XqFWZC36mupU4z1ZzxeTApV7DOw44cV4dhQ9sGwun+N89v/XP7+j7q6TanS1u1tdbK4r+1BUx7heMaIdagA==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/pinia/-/pinia-2.3.0.tgz",
+      "integrity": "sha512-ohZj3jla0LL0OH5PlLTDMzqKiVw2XARmC1XYLdLWIPBMdhDW/123ZWr4zVAhtJm+aoSkFa13pYXskAvAscIkhQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -8781,46 +8781,15 @@
         "url": "https://github.com/sponsors/posva"
       },
       "peerDependencies": {
-        "@vue/composition-api": "^1.4.0",
         "typescript": ">=4.4.4",
-        "vue": "^2.6.14 || ^3.3.0"
+        "vue": "^2.7.0 || ^3.5.11"
       },
       "peerDependenciesMeta": {
-        "@vue/composition-api": {
-          "optional": true
-        },
         "typescript": {
           "optional": true
         }
       }
     },
-    "node_modules/pinia/node_modules/vue-demi": {
-      "version": "0.14.10",
-      "resolved": "https://registry.npmjs.org/vue-demi/-/vue-demi-0.14.10.tgz",
-      "integrity": "sha512-nMZBOwuzabUO0nLgIcc6rycZEebF6eeUfaiQx9+WSk8e29IbLvPU9feI6tqW4kTo3hvoYAJkMh8n8D0fuISphg==",
-      "dev": true,
-      "hasInstallScript": true,
-      "license": "MIT",
-      "bin": {
-        "vue-demi-fix": "bin/vue-demi-fix.js",
-        "vue-demi-switch": "bin/vue-demi-switch.js"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/antfu"
-      },
-      "peerDependencies": {
-        "@vue/composition-api": "^1.0.0-rc.1",
-        "vue": "^3.0.0-0 || ^2.6.0"
-      },
-      "peerDependenciesMeta": {
-        "@vue/composition-api": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/pirates": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/pirates/-/pirates-4.0.6.tgz",
@@ -10241,6 +10210,33 @@
       "integrity": "sha512-3NaicyZ7N4B6cft4bfb7dOnPbE9CjLcx+6wZWAg5zwszfO4qXRh+U52dN5r5ZZfc6iMaxKCEcoH9CmxxoFZHLg==",
       "dev": true
     },
+    "node_modules/vue-demi": {
+      "version": "0.14.10",
+      "resolved": "https://registry.npmjs.org/vue-demi/-/vue-demi-0.14.10.tgz",
+      "integrity": "sha512-nMZBOwuzabUO0nLgIcc6rycZEebF6eeUfaiQx9+WSk8e29IbLvPU9feI6tqW4kTo3hvoYAJkMh8n8D0fuISphg==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "vue-demi-fix": "bin/vue-demi-fix.js",
+        "vue-demi-switch": "bin/vue-demi-switch.js"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      },
+      "peerDependencies": {
+        "@vue/composition-api": "^1.0.0-rc.1",
+        "vue": "^3.0.0-0 || ^2.6.0"
+      },
+      "peerDependenciesMeta": {
+        "@vue/composition-api": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/w3c-xmlserializer": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-4.0.0.tgz",
diff --git a/package.json b/package.json
index d8efb953..d37141cf 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "shvl": "^3.0.0"
   },
   "peerDependencies": {
-    "pinia": "^2.2.2"
+    "pinia": "^2.3.0"
   },
   "devDependencies": {
     "@babel/core": "7.26.0",
@@ -63,7 +63,7 @@
     "husky": "9.1.7",
     "jest": "29.7.0",
     "jest-environment-jsdom": "29.7.0",
-    "pinia": "2.2.2",
+    "pinia": "2.3.0",
     "prettier": "3.4.2",
     "rimraf": "6.0.1",
     "size-limit": "11.1.6",
diff --git a/src/plugin.ts b/src/plugin.ts
index 4c6f70b3..5d846c16 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -194,13 +194,13 @@ export function createPersistedStatePlugin<S extends StateTree = StateTree>(
         }, {} as any)
       }
       if (Array.isArray(options.excludePaths)) {
-        state = deserialize(serialize(state))
+        state = deserialize(serialize(state as any))
         options.excludePaths.forEach(function (path) {
           return shvl.set(state, path, void 0, void 0)
         }, {})
       }
 
-      const value = serialize(state)
+      const value = serialize(state as any)
       const result = storage.setItem(key, value)
       if (result instanceof Promise) {
         ++pendingCount
diff --git a/src/type.ts b/src/type.ts
index b81fb78d..f80df943 100644
--- a/src/type.ts
+++ b/src/type.ts
@@ -1,4 +1,5 @@
 import { StateTree, SubscriptionCallback } from 'pinia'
+import { UnwrapRef } from 'vue'
 
 export interface IStorage {
   getItem: (key: string) => any | Promise<any>
@@ -47,7 +48,7 @@ export interface CommonOptions<S extends StateTree = StateTree> {
    *
    * @default (state, savedState) => savedState
    */
-  merge?: (state: S, savedState: S) => S
+  merge?: (state: UnwrapRef<S>, savedState: UnwrapRef<S>) => UnwrapRef<S>
 
   /**
    * When rehydrating, overwrite initial state (patch otherwise).
@@ -61,7 +62,7 @@ export interface CommonOptions<S extends StateTree = StateTree> {
    *
    * @default JSON.stringify
    */
-  serialize?: (state: S) => any
+  serialize?: (state: UnwrapRef<S>) => any
 
   /**
    * This method will be called right after `storage.getItem`.
@@ -123,7 +124,7 @@ export type StoreOptions<S extends StateTree> = CommonOptions<S> & {
    *
    * @default {value => value}
    */
-  beforeHydrate?: (oldState: S) => void
+  beforeHydrate?: (oldState: UnwrapRef<S>) => void
 }
 
 declare module 'pinia' {