diff --git a/package.json b/package.json
index 9551e17..6ae3efd 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   },
   "homepage": "https://github.com/lependu/fastify-language-parser#readme",
   "devDependencies": {
-    "fastify": "^3.0.3",
+    "fastify": "^4.15.0",
     "standard": "^16.0.1",
     "tap": "^14.10.7"
   },