diff --git a/.ruby-version b/.ruby-version
index 49cdd668e..ef538c281 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.6
+3.1.2
diff --git a/Dockerfile b/Dockerfile
index 6e048c013..7bd97c865 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
-ARG base_image=ghcr.io/alphagov/govuk-ruby-base:2.7.6
-ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:2.7.6
+ARG base_image=ghcr.io/alphagov/govuk-ruby-base:3.1.2
+ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:3.1.2
 
 FROM $builder_image AS builder
 
diff --git a/Gemfile.lock b/Gemfile.lock
index a745d813a..ae7da0291 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -393,7 +393,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 2.7.6p219
+   ruby 3.1.2
 
 BUNDLED WITH
-   2.1.4
+   2.3.22