diff --git a/package.json b/package.json
index f06baaa..a51da8b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mercurius-integration-testing",
-  "version": "6.0.0",
+  "version": "6.0.1",
   "private": false,
   "keywords": [
     "test",
diff --git a/src/index.ts b/src/index.ts
index b90f969..b6c0d2f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -314,7 +314,9 @@ export function createMercuriusTestClient(
         } else {
           app.log.warn('Remember to close the app instance manually')
 
-          await app.listen(0)
+          await app.listen({
+            port: 0,
+          })
 
           const address = app.server.address()