diff --git a/.ruby-version b/.ruby-version
index be94e6f53..9c25013db 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.2
+3.3.6
diff --git a/Dockerfile b/Dockerfile
index 4fd18b9f5..7f15440df 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 7f062ceee..3047c14a2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-ruby "~> 3.2.0"
+ruby "~> 3.3.6"
 
 gem "rails", "7.2.2"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index bf88ec8f6..a26cedf1a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -694,7 +694,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 3.2.2p53
+   ruby 3.3.6p108
 
 BUNDLED WITH
    2.3.22