diff --git a/Dockerfile b/Dockerfile
index 70724ef..6678345 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@
 # docker run -d -p 80:80 -p 443:443 --name my-app -e RAILS_MASTER_KEY=<value from config/master.key> my-app
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=3.4.5
+ARG RUBY_VERSION=3.3.9
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here