diff --git a/package.json b/package.json
index a46eeeb..ef83dbe 100644
--- a/package.json
+++ b/package.json
@@ -26,9 +26,6 @@
   "files": [
     "dist"
   ],
-  "dependencies": {
-    "@ungap/structured-clone": "^1.0.1"
-  },
   "devDependencies": {
     "prettier": "^3.3.3",
     "vite": "^7.0.4",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4482bfe..a7023a3 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -7,10 +7,6 @@ settings:
 importers:
 
   .:
-    dependencies:
-      '@ungap/structured-clone':
-        specifier: ^1.0.1
-        version: 1.3.0
     devDependencies:
       prettier:
         specifier: ^3.3.3
@@ -300,9 +296,6 @@ packages:
   '@types/node@24.0.3':
     resolution: {integrity: sha512-R4I/kzCYAdRLzfiCabn9hxWfbuHS573x+r0dJMkkzThEa7pbrcDWK+9zu3e7aBOouf+rQAciqPFMnxwr0aWgKg==}
 
-  '@ungap/structured-clone@1.3.0':
-    resolution: {integrity: sha512-WmoN8qaIAo7WTYWbAZuG8PYEhn5fkz7dZrqTBZ7dtt//lL2Gwms1IcnQ5yHqjDfX8Ft5j4YzDM23f87zBfDe9g==}
-
   '@vitest/expect@3.2.4':
     resolution: {integrity: sha512-Io0yyORnB6sikFlt8QW5K7slY4OjqNX9jmJQ02QDda8lyM6B5oNgVWoSoKPac8/kgnCUzuHQKrSLtu/uOqqrig==}
 
@@ -716,8 +709,6 @@ snapshots:
       undici-types: 7.8.0
     optional: true
 
-  '@ungap/structured-clone@1.3.0': {}
-
   '@vitest/expect@3.2.4':
     dependencies:
       '@types/chai': 5.2.2
diff --git a/src/deserialize.js b/src/deserialize.js
index a1edacc..dc90e0f 100644
--- a/src/deserialize.js
+++ b/src/deserialize.js
@@ -1,5 +1,3 @@
-import structuredClone from "@ungap/structured-clone"
-
 export function deserialize(originalResponse, options = {}) {
   const response = structuredClone(originalResponse)
   if (!options) {
diff --git a/vite.config.ts b/vite.config.ts
index d678d95..10e9ee2 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,8 +1,6 @@
 import { defineConfig } from "vite"
 import { resolve } from "path"
 
-const external = ["@ungap/structured-clone"]
-
 export default defineConfig({
   build: {
     lib: {
@@ -12,9 +10,6 @@ export default defineConfig({
       },
       formats: ["es"],
       fileName: (_format, entryName) => `${entryName}.js`
-    },
-    rollupOptions: {
-      external
     }
   }
 })