diff --git a/Dockerfile b/Dockerfile
index 3412894..ecd6afd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.12-slim-trixie
+FROM ruby:4.0.6-slim-trixie
 
 RUN apt-get update -qq && apt-get install -y build-essential git ruby-dev && apt-get clean && \
   mkdir -p /usr/src/app/lib/keycloak-admin