diff --git a/package.json b/package.json
index 254111e..48cd6c7 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "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"
   },
   "repository": {
@@ -78,9 +78,9 @@
     "shortid": "^2.2.16",
     "superheroes": "^4.0.0",
     "svelte": "^3.44.0",
-    "tsd": "^0.33.0"
+    "tstyche": "^7.0.0"
   },
   "publishConfig": {
     "access": "public"
   }
-}
+}
\ No newline at end of file
diff --git a/types/index.test-d.ts b/types/index.tst.ts
similarity index 75%
rename from types/index.test-d.ts
rename to types/index.tst.ts
index a449398..24ca7de 100644
--- a/types/index.test-d.ts
+++ b/types/index.tst.ts
@@ -1,7 +1,7 @@
 import fastify, { FastifyInstance } from 'fastify'
 import hotwire from '..'
 import { join } from 'node:path'
-import { expectType } from 'tsd'
+import { expect } from 'tstyche'
 
 const app: FastifyInstance = fastify()
 app.register(hotwire, {
@@ -10,10 +10,14 @@ app.register(hotwire, {
 })
 
 app.get('/stream', async (_req, reply) => {
+  expect(
+    reply.turboStream.append('file', 'target', { hello: 'world' })
+  ).type.toBe(reply)
+
   return reply.turboStream.append('file', 'target', { hello: 'world' })
 })
 
 app.get('/generate', async (_req, reply) => {
   const fragment = await reply.turboGenerate.append('file', 'target', { hello: 'world' })
-  expectType<string>(fragment)
+  expect(fragment).type.toBe<string>()
 })