diff --git a/package.json b/package.json
index 20aebb6..ab864aa 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "fastify": "^4.0.0-rc.2",
     "standard": "^17.0.0",
     "tap": "^16.0.0",
-    "tsd": "^0.20.0"
+    "tsd": "^0.21.0"
   },
   "dependencies": {
     "basic-auth": "^2.0.1",