diff --git a/tools/phpstan/Dockerfile b/tools/phpstan/Dockerfile
index bd937d09..2250533e 100644
--- a/tools/phpstan/Dockerfile
+++ b/tools/phpstan/Dockerfile
@@ -1,4 +1,4 @@
-FROM composer:2.8.3 AS composer
+FROM composer:2.8.4 AS composer
 
 FROM php:8.3-cli-alpine3.17 AS base