diff --git a/package.json b/package.json
index f2a1e71..49691c6 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,8 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@types/ungap__structured-clone": "^0.3.0",
+    "@ungap/structured-clone": "^1.2.0",
     "autoprefixer": "^10.4.14",
     "postcss": "^8.4.24",
     "preact": "^10.15.1",
diff --git a/src/chatbox.tsx b/src/chatbox.tsx
index 7902ce2..197b2b0 100644
--- a/src/chatbox.tsx
+++ b/src/chatbox.tsx
@@ -1,3 +1,4 @@
+import structuredClone from '@ungap/structured-clone'
 import { createRef } from "preact";
 import { StateUpdater, useEffect, useState } from "preact/hooks";
 import { ChatStore, STORAGE_NAME_TEMPLATE, addTotalCost } from "./app";
diff --git a/yarn.lock b/yarn.lock
index 046da5c..94f004e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -452,6 +452,16 @@
     estree-walker "^2.0.1"
     picomatch "^2.2.2"
 
+"@types/ungap__structured-clone@^0.3.0":
+  version "0.3.0"
+  resolved "https://registry.npmmirror.com/@types/ungap__structured-clone/-/ungap__structured-clone-0.3.0.tgz#39ef89de1f04bb1920ed99e549b885331295c47d"
+  integrity sha512-eBWREUhVUGPze+bUW22AgUr05k8u+vETzuYdLYSvWqGTUe0KOf+zVnOB1qER5wMcw8V6D9Ar4DfJmVvD1yu0kQ==
+
+"@ungap/structured-clone@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.npmmirror.com/@ungap/structured-clone/-/structured-clone-1.2.0.tgz#756641adb587851b5ccb3e095daf27ae581c8406"
+  integrity sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ==
+
 ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"