diff --git a/.ruby-version b/.ruby-version
index fa7adc7ac..47b322c97 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.5
+3.4.1
diff --git a/.tool-versions b/.tool-versions
index 5fc46ff03..801a6255f 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
 terraform 1.8.4
-ruby 3.3.3
+ruby 3.4.1
 nodejs 16.17.0
diff --git a/Gemfile b/Gemfile
index 356627341..cab354563 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby "3.3.5"
+ruby "3.4.1"
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem "rails", "~> 8.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index bb521ec25..61aff3388 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -291,7 +291,7 @@ GEM
     jbuilder (2.13.0)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
-    json (2.9.0)
+    json (2.9.1)
     json-jwt (1.15.3.1)
       activesupport (>= 4.2)
       aes_key_wrap
@@ -848,6 +848,7 @@ PLATFORMS
   arm64-darwin-23
   ruby
   x86_64-darwin-21
+  x86_64-darwin-24
   x86_64-linux
 
 DEPENDENCIES
@@ -910,7 +911,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 3.3.5p100
+   ruby 3.4.1p0
 
 BUNDLED WITH
    2.5.13
diff --git a/README.md b/README.md
index 1bd26d9f9..63028b500 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Architecture decision records can be found in the
 
 ## Prerequisites
 
-- Ruby 3.3.3
+- Ruby 3.4.1
 - PostgreSQL
 - [ShellCheck](https://www.shellcheck.net/)
 - [Yarn](https://yarnpkg.com/en/docs/install)