diff --git a/index.js b/index.js
index 7a57991..5c8cb45 100644
--- a/index.js
+++ b/index.js
@@ -38,6 +38,6 @@ async function fastifyElasticsearch (fastify, options) {
 }
 
 module.exports = fp(fastifyElasticsearch, {
-  fastify: '^4.0.0',
+  fastify: '4.x',
   name: '@fastify/elasticsearch'
 })