diff --git a/jest.config.js b/jest.config.js
index 877c5da4..e4a2fe6c 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -14,6 +14,7 @@ const customJestConfig = {
     isows: "<rootDir>/node_modules/isows/_cjs/index.js", // https://github.com/wagmi-dev/viem/issues/1329
     tinykeys: "<rootDir>/node_modules/tinykeys/dist/tinykeys.js",
   },
+  setupFiles: ["<rootDir>/jest.polyfills.js"],
   setupFilesAfterEnv: ["<rootDir>/jest.setup.js"],
   testEnvironment: "jest-environment-jsdom",
   testPathIgnorePatterns: [
diff --git a/jest.polyfills.js b/jest.polyfills.js
new file mode 100644
index 00000000..c76513f3
--- /dev/null
+++ b/jest.polyfills.js
@@ -0,0 +1,28 @@
+// https://mswjs.io/docs/faq/#referenceerror-fetch-is-not-defined-in-nodejs
+// https://mswjs.io/docs/faq/#requestresponsetextencoder-is-not-defined-jest
+
+const { ReadableStream } = require("stream/web");
+const { clearImmediate, setImmediate } = require("timers");
+const { TextDecoder, TextEncoder } = require("util");
+
+Object.defineProperties(global, {
+  ReadableStream: { value: ReadableStream },
+  TextDecoder: { value: TextDecoder },
+  TextEncoder: { value: TextEncoder },
+  clearImmediate: { value: clearImmediate },
+  setImmediate: { value: setImmediate },
+});
+
+const { Blob, File } = require("buffer");
+const { fetch, FormData, Headers, Request, Response } = require("undici");
+
+Object.defineProperties(global, {
+  Blob: { value: Blob },
+  File: { value: File },
+  FormData: { value: FormData },
+  Headers: { value: Headers },
+  Request: { value: Request },
+  ResizeObserver: { value: require("resize-observer-polyfill") },
+  Response: { value: Response },
+  fetch: { value: fetch, writable: true },
+});
diff --git a/jest.setup.js b/jest.setup.js
index d788b5b9..ee144735 100644
--- a/jest.setup.js
+++ b/jest.setup.js
@@ -1,9 +1,4 @@
-import "@testing-library/jest-dom/extend-expect";
-
-global.ResizeObserver = require("resize-observer-polyfill");
-
-// eslint-disable-next-line @typescript-eslint/no-var-requires
-global.TextEncoder = require("util").TextEncoder;
+import "@testing-library/jest-dom";
 
 // suppress zustand deprecation notice to clear out logs
 global.console.warn = (...args) =>
diff --git a/package-lock.json b/package-lock.json
index a60eddc2..ebee3eda 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -69,6 +69,7 @@
         "react-dom": "^18.2.0",
         "tailwindcss": "^3.3.6",
         "tinykeys": "^2.1.0",
+        "undici": "^6.0.1",
         "viem": "^1.19.13",
         "wagmi": "^1.4.10",
         "zod": "^3.22.4",
@@ -3071,6 +3072,14 @@
         "shx": "^0.3.4"
       }
     },
+    "node_modules/@fastify/busboy": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@fastify/busboy/-/busboy-2.1.0.tgz",
+      "integrity": "sha512-+KpH+QxZU7O4675t3mnkQKcZZg56u+K/Ct2K+N2AZYNVK8kyeo/bI18tI8aPm3tvNNRyTWfj6s5tnGNlcbQRsA==",
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/@fastify/deepmerge": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/@fastify/deepmerge/-/deepmerge-1.3.0.tgz",
@@ -22800,6 +22809,17 @@
       "resolved": "https://registry.npmjs.org/uncrypto/-/uncrypto-0.1.3.tgz",
       "integrity": "sha512-Ql87qFHB3s/De2ClA9e0gsnS6zXG27SkTiSJwjCc9MebbfapQfuPzumMIUMi38ezPZVNFcHI9sUIepeQfw8J8Q=="
     },
+    "node_modules/undici": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.0.1.tgz",
+      "integrity": "sha512-eZFYQLeS9BiXpsU0cuFhCwfeda2MnC48EVmmOz/eCjsTgmyTdaHdVsPSC/kwC2GtW2e0uH0HIPbadf3/bRWSxw==",
+      "dependencies": {
+        "@fastify/busboy": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=18.0"
+      }
+    },
     "node_modules/undici-types": {
       "version": "5.26.5",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
diff --git a/package.json b/package.json
index 7e97fdf0..1b90c02a 100644
--- a/package.json
+++ b/package.json
@@ -74,6 +74,7 @@
     "react-dom": "^18.2.0",
     "tailwindcss": "^3.3.6",
     "tinykeys": "^2.1.0",
+    "undici": "^6.0.1",
     "viem": "^1.19.13",
     "wagmi": "^1.4.10",
     "zod": "^3.22.4",