diff --git a/package.json b/package.json
index a845f8d..443ed2e 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "test": "npm run test:unit && npm run test:jest && npm run test:typescript",
     "test:jest": "jest jest.test.js",
     "test:unit": "c8 --100 node --test",
-    "test:typescript": "tsd"
+    "test:typescript": "tstyche"
   },
   "repository": {
     "type": "git",
@@ -67,6 +67,6 @@
     "eslint": "^9.17.0",
     "jest": "^30.0.3",
     "neostandard": "^0.13.0",
-    "tsd": "^0.33.0"
+    "tstyche": "^7.0.0"
   }
-}
+}
\ 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 fe338e1..0000000
--- a/types/index.test-d.ts
+++ /dev/null
@@ -1,36 +0,0 @@
-import { expectType } from 'tsd'
-import { createWarning, createDeprecation } from '..'
-
-const WarnInstance = createWarning({
-  name: 'TypeScriptWarning',
-  code: 'CODE',
-  message: 'message'
-})
-
-expectType<string>(WarnInstance.code)
-expectType<string>(WarnInstance.message)
-expectType<string>(WarnInstance.name)
-expectType<boolean>(WarnInstance.emitted)
-expectType<boolean>(WarnInstance.unlimited)
-
-expectType<void>(WarnInstance())
-expectType<void>(WarnInstance('foo'))
-expectType<void>(WarnInstance('foo', 'bar'))
-
-const buildWarnUnlimited = createWarning({
-  name: 'TypeScriptWarning',
-  code: 'CODE',
-  message: 'message',
-  unlimited: true
-})
-expectType<boolean>(buildWarnUnlimited.unlimited)
-
-const DeprecationInstance = createDeprecation({
-  code: 'CODE',
-  message: 'message'
-})
-expectType<string>(DeprecationInstance.code)
-
-DeprecationInstance()
-DeprecationInstance('foo')
-DeprecationInstance('foo', 'bar')
diff --git a/types/index.tst.ts b/types/index.tst.ts
new file mode 100644
index 0000000..2f953af
--- /dev/null
+++ b/types/index.tst.ts
@@ -0,0 +1,38 @@
+import { expect } from 'tstyche'
+import { createWarning, createDeprecation } from '..'
+
+const WarnInstance = createWarning({
+  name: 'TypeScriptWarning',
+  code: 'CODE',
+  message: 'message'
+})
+
+expect(WarnInstance.code).type.toBe<string>()
+expect(WarnInstance.message).type.toBe<string>()
+expect(WarnInstance.name).type.toBe<string>()
+expect(WarnInstance.emitted).type.toBe<boolean>()
+expect(WarnInstance.unlimited).type.toBe<boolean>()
+
+expect(WarnInstance()).type.toBe<void>()
+expect(WarnInstance('foo')).type.toBe<void>()
+expect(WarnInstance('foo', 'bar')).type.toBe<void>()
+
+const buildWarnUnlimited = createWarning({
+  name: 'TypeScriptWarning',
+  code: 'CODE',
+  message: 'message',
+  unlimited: true
+})
+
+expect(buildWarnUnlimited.unlimited).type.toBe<boolean>()
+
+const DeprecationInstance = createDeprecation({
+  code: 'CODE',
+  message: 'message'
+})
+
+expect(DeprecationInstance.code).type.toBe<string>()
+
+expect(DeprecationInstance()).type.toBe<void>()
+expect(DeprecationInstance('foo')).type.toBe<void>()
+expect(DeprecationInstance('foo', 'bar')).type.toBe<void>()