diff --git a/package.json b/package.json
index cce55f4..4644076 100644
--- a/package.json
+++ b/package.json
@@ -22,13 +22,13 @@
   },
   "homepage": "https://github.com/fastify/fast-json-stringify-compiler#readme",
   "devDependencies": {
-    "fastify": "^4.0.0-rc.2",
+    "fastify": "^4.0.0",
     "standard": "^17.0.0",
     "tap": "^16.0.0",
     "tsd": "^0.20.0"
   },
   "dependencies": {
-    "fast-json-stringify": "^4.0.0"
+    "fast-json-stringify": "^4.2.0"
   },
   "tsd": {
     "directory": "test/types"