diff --git a/.ruby-version b/.ruby-version
index b347b11e..4d9d11cf 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.3
+3.4.2
diff --git a/Dockerfile b/Dockerfile
index 169413ad..864dbd68 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=3.2.3
+ARG RUBY_VERSION=3.4.2
 FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
 
 # Rails app lives here
diff --git a/Gemfile b/Gemfile
index 5eab2e33..f3020eaa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 source "https://rubygems.org"
 
-ruby "3.2.3"
+ruby "3.4.2"
 
 git_source(:github) do |repo_name|
   repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
diff --git a/Gemfile.lock b/Gemfile.lock
index 6fb608a2..5910e15f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -376,9 +376,6 @@ GEM
     grpc (1.69.0)
       google-protobuf (>= 3.25, < 5.0)
       googleapis-common-protos-types (~> 1.0)
-    grpc (1.69.0-x86_64-linux)
-      google-protobuf (>= 3.25, < 5.0)
-      googleapis-common-protos-types (~> 1.0)
     grpc-google-iam-v1 (1.8.0)
       google-protobuf (>= 3.18, < 5.a)
       googleapis-common-protos (~> 1.4)
@@ -879,7 +876,7 @@ DEPENDENCIES
   whenever
 
 RUBY VERSION
-   ruby 3.2.3p157
+   ruby 3.4.2p28
 
 BUNDLED WITH
    2.5.6
diff --git a/README.md b/README.md
index abe19f57..eefdc12a 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ bin/dev
 
 ### REQUIREMENTS ###
 
-  - **Ruby version:** 3.2.3
+  - **Ruby version:** 3.4.2
   - **PostgreSQL 12.1+** [How to install](http://exponential.io/blog/2015/02/21/install-postgresql-on-mac-os-x-via-brew/)
 
 **Just execute the script file in `bin/setup`**