diff --git a/auth.js b/auth.js
index 638641c..3c223cc 100644
--- a/auth.js
+++ b/auth.js
@@ -197,7 +197,7 @@ function auth (pluginOptions) {
 }
 
 module.exports = fp(fastifyAuth, {
-  fastify: '4.x',
+  fastify: '5.x',
   name: '@fastify/auth'
 })
 module.exports.default = fastifyAuth