diff --git a/.ruby-version b/.ruby-version
index ea897ac..1cf76f5 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-4.0.5
+ruby-4.0.6
diff --git a/Dockerfile b/Dockerfile
index fb27e41..8c9e94b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:4.0.5-slim-bookworm AS builder
+FROM ruby:4.0.6-slim-bookworm AS builder
 
 RUN apt-get update && apt-get install -y build-essential libmariadb-dev libyaml-dev && rm -rf /var/lib/apt/lists/*
 
@@ -18,7 +18,7 @@ COPY . .
 RUN RAILS_ENV=production SECRET_KEY_BASE=irrelevant bundle exec rails assets:precompile
 
 
-FROM ruby:4.0.5-slim-bookworm
+FROM ruby:4.0.6-slim-bookworm
 LABEL maintainer="aaron@spettl.de"
 
 RUN apt-get update && apt-get install -y libmariadb3 libyaml-0-2 && rm -rf /var/lib/apt/lists/*
diff --git a/Gemfile b/Gemfile
index 2a97d51..8f32aaa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '4.0.5'
+ruby '4.0.6'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails', branch: 'main'
 gem 'rails', '~> 8.1.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1fad914..5a79e7d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -352,7 +352,7 @@ DEPENDENCIES
   web-console (>= 4.1.0)
 
 RUBY VERSION
-  ruby 4.0.5
+  ruby 4.0.6
 
 BUNDLED WITH
-  4.0.10
+  4.0.16