diff --git a/package.json b/package.json
index 4c4cd8f..bc88a53 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
   "devDependencies": {
     "ava": "^4.0.1",
     "c8": "^7.10.0",
-    "fastify": "^3.0.0",
+    "fastify": "^4.14.1",
     "fastify-cli": "^2.5.1",
     "husky": "^7.0.4",
     "lint-staged": "^12.1.2",