diff --git a/docker/app/Dockerfile b/docker/app/Dockerfile
index 272169060..09e7710e6 100644
--- a/docker/app/Dockerfile
+++ b/docker/app/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.5-fpm-alpine
+FROM php:8.5.9RC1-fpm-alpine
 
 LABEL maintainer="Samuel Weirich"
 LABEL description="Development and production container for PILOS, compatible with laravel sail; heavily inspired by offical image"