diff --git a/README.md b/README.md
index acdb384..51c9f45 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,10 @@ This package is responsible for compiling the application's `response` JSON sche
 
 ## Versions
 
-| `@fastify/fast-json-stringify-compiler` | `fast-json-stringify` | Default in `fastify` |
-|----------------------------------------:|----------------------:|---------------------:|
-|                                    v1.x |                  v3.x |                 ^4.x |
+| `@fastify/fast-json-stringify-compiler` | `fast-json-stringify` | Supported `fastify` |
+|----------------------------------------:|----------------------:|--------------------:|
+|                                    v1.x |                  v3.x |                ^3.x |
+|                                    v2.x |                  v3.x |                ^4.x |
 
 ### fast-json-stringify Configuration
 
diff --git a/package.json b/package.json
index 3ae17a2..fe9015a 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
   },
   "homepage": "https://github.com/fastify/fast-json-stringify-compiler#readme",
   "devDependencies": {
-    "fastify": "^3.25.3",
+    "fastify": "^4.0.0-rc.2",
     "standard": "^17.0.0",
     "tap": "^16.0.0",
     "tsd": "^0.20.0"