diff --git a/Dockerfile b/Dockerfile
index a79aa1d..06a4505 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.4.9-alpine3.22 AS base
+FROM ruby:4.0.4-alpine3.22 AS base
 
 ENV APP_HOME=/app
 ENV LANG=C.UTF-8