diff --git a/.ruby-version b/.ruby-version
index 408069a..753ec9c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-3.4.1
+ruby-3.4.3
diff --git a/Dockerfile b/Dockerfile
index 0da043a..1ffb05a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@
 # For a containerized dev environment, see Dev Containers: https://guides.rubyonrails.org/getting_started_with_devcontainer.html
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version
-ARG RUBY_VERSION=3.4.1
+ARG RUBY_VERSION=3.4.3
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here
diff --git a/Dockerfile.dev b/Dockerfile.dev
index 868245c..fe3a01d 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -1,4 +1,4 @@
-FROM ruby:3.4.1
+FROM ruby:3.4.3
 
 # Install system dependencies
 RUN apt-get update -qq && \