diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 95a4f14..06b7154 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.3.1'
+          - '3.4.1'
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.rubocop.yml b/.rubocop.yml
index fe73b34..28a0759 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -19,4 +19,4 @@ inherit_mode:
 # **************************************************************
 
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.4
diff --git a/Gemfile.lock b/Gemfile.lock
index f85acfd..e3cda10 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,6 +104,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-22
+  arm64-darwin-24
   x86_64-darwin-22
   x86_64-linux
 
diff --git a/govuk-forms-markdown.gemspec b/govuk-forms-markdown.gemspec
index b8f8bdd..a31124f 100644
--- a/govuk-forms-markdown.gemspec
+++ b/govuk-forms-markdown.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "This gem renders the limited subset of Markdown syntax supported by GOV.UK Forms."
   spec.homepage = "https://github.com/alphagov/govuk-forms-markdown"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.0.0"
+  spec.required_ruby_version = ">= 3.4.1"
 
   spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"
 
diff --git a/lib/govuk_forms_markdown.rb b/lib/govuk_forms_markdown.rb
index 610a483..ef23f18 100644
--- a/lib/govuk_forms_markdown.rb
+++ b/lib/govuk_forms_markdown.rb
@@ -8,11 +8,11 @@ module GovukFormsMarkdown
   class Error < StandardError; end
 
   def self.render(markdown, allow_headings: true)
-    renderer = GovukFormsMarkdown::Renderer.new({ link_attributes: { class: "govuk-link", rel: "noreferrer noopener", target: "_blank" } }, allow_headings: allow_headings)
+    renderer = GovukFormsMarkdown::Renderer.new({ link_attributes: { class: "govuk-link", rel: "noreferrer noopener", target: "_blank" } }, allow_headings:)
     Redcarpet::Markdown.new(renderer, no_intra_emphasis: true, disable_indented_code_blocks: true).render(markdown).strip
   end
 
   def self.validate(markdown, allow_headings: true)
-    GovukFormsMarkdown::Validator.new(markdown, allow_headings: allow_headings).validate
+    GovukFormsMarkdown::Validator.new(markdown, allow_headings:).validate
   end
 end
diff --git a/spec/govuk-forms-markdown/renderer/header_spec.rb b/spec/govuk-forms-markdown/renderer/header_spec.rb
index 4b9bb12..90a98bc 100644
--- a/spec/govuk-forms-markdown/renderer/header_spec.rb
+++ b/spec/govuk-forms-markdown/renderer/header_spec.rb
@@ -2,7 +2,7 @@
 
 # rubocop:disable RSpec/FilePath
 RSpec.describe GovukFormsMarkdown::Renderer, "#header" do
-  subject(:renderer) { described_class.new(allow_headings: allow_headings) }
+  subject(:renderer) { described_class.new(allow_headings:) }
 
   let(:allow_headings) { true }
 
diff --git a/spec/govuk-forms-markdown/validator/validator_spec.rb b/spec/govuk-forms-markdown/validator/validator_spec.rb
index ff9ccbe..6b69e11 100644
--- a/spec/govuk-forms-markdown/validator/validator_spec.rb
+++ b/spec/govuk-forms-markdown/validator/validator_spec.rb
@@ -2,7 +2,7 @@
 
 # rubocop:disable RSpec/FilePath
 RSpec.describe GovukFormsMarkdown::Validator do
-  let(:validator) { described_class.new(markdown, allow_headings: allow_headings) }
+  let(:validator) { described_class.new(markdown, allow_headings:) }
   let(:allow_headings) { true }
 
   describe "#validate_length" do