diff --git a/.ruby-version b/.ruby-version
index 84d6c67..43beb40 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.10
+4.0.7
diff --git a/Dockerfile b/Dockerfile
index 1002a6c..195fd22 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1
 
 # Make sure it matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=3.4.10
+ARG RUBY_VERSION=4.0.7
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here
diff --git a/Dockerfile-export b/Dockerfile-export
index d130d17..c1a87a0 100644
--- a/Dockerfile-export
+++ b/Dockerfile-export
@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1
 
 # Make sure it matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=3.4.10
+ARG RUBY_VERSION=4.0.7
 FROM ruby:$RUBY_VERSION-slim as base
 
 # Install the tools we need