diff --git a/.ruby-version b/.ruby-version
index be94e6f5..bea438e9 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.2
+3.3.1
diff --git a/Dockerfile b/Dockerfile
index 6efd4c69..b0c2cb1b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG ruby_version=3.2
+ARG ruby_version=3.3
 ARG base_image=ghcr.io/alphagov/govuk-ruby-base:$ruby_version
 ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:$ruby_version
 
diff --git a/Gemfile b/Gemfile
index d4b6c3c4..ebf23cc1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-ruby "~> 3.2.0"
+ruby "~> 3.3.1"
 
 gem "bootsnap", require: false
 gem "bunny"
diff --git a/Gemfile.lock b/Gemfile.lock
index eb1776d5..9963579c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -499,7 +499,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 3.2.2p53
+   ruby 3.3.1p55
 
 BUNDLED WITH
    2.4.3