diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2bf56f26..ec5a3db9 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -15,13 +15,13 @@ executors:
           GITHUB_TEAM_NAME_SLUG: laa-apply-for-legal-aid
   linting-executor:
     docker:
-      - image: cimg/ruby:3.3.6-node
+      - image: cimg/ruby:3.4.1-node
         environment:
           RAILS_ENV: test
           TZ: "Europe/London"
   test-executor:
     docker:
-      - image: cimg/ruby:3.3.6-node
+      - image: cimg/ruby:3.4.1-node
         environment:
           RAILS_ENV: test
           PGHOST: localhost
@@ -51,7 +51,7 @@ references:
   restore_gems_cache: &restore_gems_cache
     restore_cache:
       keys:
-        - legal-framework-api-{{ checksum "Gemfile.lock" }}-v3.3.6
+        - legal-framework-api-{{ checksum "Gemfile.lock" }}-v3.4.1
   install_gems: &install_gems
     run:
       name: Install ruby gems
@@ -62,7 +62,7 @@ references:
         bundle install --jobs=4 && bundle clean
   save_gems_cache: &save_gems_cache
     save_cache:
-      key: legal-framework-api-{{ checksum "Gemfile.lock" }}-v3.3.6
+      key: legal-framework-api-{{ checksum "Gemfile.lock" }}-v3.4.1
       paths:
         - vendor/bundle
   install_packages_for_testing: &install_packages_for_testing
diff --git a/.ruby-version b/.ruby-version
index 9c25013d..47b322c9 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.6
+3.4.1
diff --git a/Dockerfile b/Dockerfile
index 7fe7767e..6c58f137 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.6-alpine3.21
+FROM ruby:3.4.1-alpine3.21
 MAINTAINER apply for legal aid team
 
 ENV RAILS_ENV production
diff --git a/Gemfile.lock b/Gemfile.lock
index e0a12720..a703c5a7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -379,7 +379,7 @@ DEPENDENCIES
   tzinfo-data
 
 RUBY VERSION
-   ruby 3.3.6p108
+   ruby 3.4.1p0
 
 BUNDLED WITH
    2.5.11