diff --git a/package.json b/package.json
index 06fea71..ab33e38 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "lint": "eslint",
     "lint:fix": "eslint --fix",
     "test": "npm run test:unit && npm run test:typescript",
-    "test:typescript": "tsd",
+    "test:typescript": "tstyche",
     "test:unit": "c8 --100 node --test"
   },
   "keywords": [
@@ -65,16 +65,13 @@
     "eslint": "^9.17.0",
     "fastify": "^5.0.0",
     "neostandard": "^0.13.0",
-    "tsd": "^0.33.0",
+    "tstyche": "^7.1.0",
     "typescript": "~6.0.2"
   },
   "dependencies": {
     "fastify-plugin": "^5.0.0",
     "toad-cache": "^3.7.0"
   },
-  "tsd": {
-    "directory": "test"
-  },
   "publishConfig": {
     "access": "public"
   }
diff --git a/types/index.test-d.ts b/types/index.tst.ts
similarity index 85%
rename from types/index.test-d.ts
rename to types/index.tst.ts
index 4040e66..55c26e4 100644
--- a/types/index.test-d.ts
+++ b/types/index.tst.ts
@@ -1,5 +1,5 @@
 import fastify, { FastifyRequest } from 'fastify'
-import { expectType } from 'tsd'
+import { expect } from 'tstyche'
 import fastifyCors, {
   AsyncOriginFunction,
   FastifyCorsOptions,
@@ -240,7 +240,10 @@ appHttp2.register(fastifyCors, {
 })
 
 appHttp2.register(fastifyCors, {
-  origin: (origin: string | undefined, cb: (err: Error | null, allow: boolean) => void) => {
+  origin: (
+    origin: string | undefined,
+    cb: (err: Error | null, allow: boolean) => void
+  ) => {
     if (origin === undefined || /localhost/.test(origin)) {
       cb(null, true)
       return
@@ -259,39 +262,47 @@ appHttp2.register(fastifyCors, {
   strictPreflight: false
 })
 
-appHttp2.register(fastifyCors, (): FastifyCorsOptionsDelegate => (_req, cb) => {
-  cb(null, {
-    origin: [/\*/, /something/],
-    allowedHeaders: ['authorization', 'content-type'],
-    methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
-    credentials: true,
-    exposedHeaders: ['authorization'],
-    maxAge: 13000,
-    cacheControl: 13000,
-    preflightContinue: false,
-    optionsSuccessStatus: 200,
-    preflight: false,
-    strictPreflight: false
-  })
-})
+appHttp2.register(
+  fastifyCors,
+  (): FastifyCorsOptionsDelegate => (_req, cb) => {
+    cb(null, {
+      origin: [/\*/, /something/],
+      allowedHeaders: ['authorization', 'content-type'],
+      methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
+      credentials: true,
+      exposedHeaders: ['authorization'],
+      maxAge: 13000,
+      cacheControl: 13000,
+      preflightContinue: false,
+      optionsSuccessStatus: 200,
+      preflight: false,
+      strictPreflight: false
+    })
+  }
+)
 
-appHttp2.register(fastifyCors, (): FastifyCorsOptionsDelegatePromise => () => {
-  return Promise.resolve({
-    origin: [/\*/, /something/],
-    allowedHeaders: ['authorization', 'content-type'],
-    methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
-    credentials: true,
-    exposedHeaders: ['authorization'],
-    maxAge: 13000,
-    cacheControl: 13000,
-    preflightContinue: false,
-    optionsSuccessStatus: 200,
-    preflight: false,
-    strictPreflight: false
-  })
-})
+appHttp2.register(
+  fastifyCors,
+  (): FastifyCorsOptionsDelegatePromise => () => {
+    return Promise.resolve({
+      origin: [/\*/, /something/],
+      allowedHeaders: ['authorization', 'content-type'],
+      methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
+      credentials: true,
+      exposedHeaders: ['authorization'],
+      maxAge: 13000,
+      cacheControl: 13000,
+      preflightContinue: false,
+      optionsSuccessStatus: 200,
+      preflight: false,
+      strictPreflight: false
+    })
+  }
+)
 
-const delegate: FastifyPluginOptionsDelegate<FastifyCorsOptionsDelegatePromise> = () => async () => {
+const delegate: FastifyPluginOptionsDelegate<
+  FastifyCorsOptionsDelegatePromise
+> = () => async () => {
   return {
     origin: [/\*/, /something/],
     allowedHeaders: ['authorization', 'content-type'],
@@ -372,17 +383,19 @@ appHttp2.register(fastifyCors, delegate)
 appHttp2.register(fastifyCors, {
   hook: 'preParsing',
   origin: function (origin, cb) {
-    expectType<string | undefined>(origin)
+    expect(origin).type.toBe<string | undefined>()
     cb(null, false)
-  },
+  }
 })
 
-const asyncOriginFn: AsyncOriginFunction = async function (origin): Promise<boolean> {
-  expectType<string | undefined>(origin)
+const asyncOriginFn: AsyncOriginFunction = async function (
+  origin
+): Promise<boolean> {
+  expect(origin).type.toBe<string | undefined>()
   return false
 }
 
 appHttp2.register(fastifyCors, {
   hook: 'preParsing',
-  origin: asyncOriginFn,
+  origin: asyncOriginFn
 })