diff --git a/package.json b/package.json
index 69a96b1..abf42c8 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "c8": "^11.0.0",
     "eslint": "^9.17.0",
     "neostandard": "^0.13.0",
-    "tsd": "^0.33.0"
+    "tstyche": "^7.0.0"
   },
   "types": "types/index.d.ts",
   "files": [
@@ -69,6 +69,6 @@
     "lint:fix": "eslint --fix",
     "test": "npm run test:unit && npm run test:typescript",
     "test:unit": "c8 --100 node --test",
-    "test:typescript": "tsd"
+    "test:typescript": "tstyche"
   }
-}
+}
\ No newline at end of file
diff --git a/types/index.test-d.ts b/types/index.test-d.ts
deleted file mode 100644
index 81c35cd..0000000
--- a/types/index.test-d.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { IncomingMessage } from 'node:http'
-import { expectError, expectType } from 'tsd'
-import forwardedESM, { forwarded } from '..'
-import * as forwardedVarImport from '..'
-
-expectType<string[]>(forwardedESM({} as IncomingMessage))
-expectType<string[]>(forwarded({} as IncomingMessage))
-expectType<string[]>(forwardedVarImport.default({} as IncomingMessage))
-expectType<string[]>(forwardedVarImport.forwarded({} as IncomingMessage))
-expectError(forwarded())
-expectError(forwarded('10.0.0.1'))
diff --git a/types/index.tst.ts b/types/index.tst.ts
new file mode 100644
index 0000000..06f2973
--- /dev/null
+++ b/types/index.tst.ts
@@ -0,0 +1,17 @@
+/// <reference types="node" />
+
+import { type IncomingMessage } from 'node:http'
+import { expect } from 'tstyche'
+import forwardedESM, { forwarded } from '.'
+import * as forwardedVarImport from '.'
+
+expect(forwardedESM({} as IncomingMessage)).type.toBe<string[]>()
+expect(forwarded({} as IncomingMessage)).type.toBe<string[]>()
+
+expect(forwardedVarImport.default({} as IncomingMessage)).type.toBe<string[]>()
+expect(forwardedVarImport.forwarded({} as IncomingMessage)).type.toBe<
+  string[]
+>()
+
+expect(forwarded).type.not.toBeCallableWith()
+expect(forwarded).type.not.toBeCallableWith('10.0.0.1')