diff --git a/.github/workflows/release-ruby.yml b/.github/workflows/release-ruby.yml
index 435b3604..0fac0cca 100644
--- a/.github/workflows/release-ruby.yml
+++ b/.github/workflows/release-ruby.yml
@@ -22,7 +22,7 @@ jobs:
       - uses: ./.github/actions/prepare
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: '3.4'
           bundler-cache: true
           working-directory: ruby
       - name: Publish ruby gem
diff --git a/.github/workflows/test-ruby.yml b/.github/workflows/test-ruby.yml
index ee538ea5..502727d0 100644
--- a/.github/workflows/test-ruby.yml
+++ b/.github/workflows/test-ruby.yml
@@ -26,10 +26,10 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
+        ruby: ['3.1', '3.2', '3.3', '3.4', '3.5']
         include:
           - os: macos-latest
-            ruby: '3.3'
+            ruby: '3.4'
     steps:
       - uses: actions/checkout@v5
       - uses: ./.github/actions/prepare
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9114be6a..16ab9864 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Changed
+- [Ruby] Minimum ruby version is now 3.1+ (Bumped CI workflows also) ([#441](https://github.com/cucumber/html-formatter/pull/441))
+- Upgrade `cucumber-messages` to [30.0.0](https://github.com/cucumber/messages/releases/tag/v30.0.0)
 
 ## [21.15.1] - 2025-09-11
 ### Fixed
diff --git a/java/pom.xml b/java/pom.xml
index 1cd14134..de572eec 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -51,7 +51,7 @@
         <dependency>
             <groupId>io.cucumber</groupId>
             <artifactId>messages</artifactId>
-            <version>[18.0.0,30.0.0)</version>
+            <version>[18.0.0,31.0.0)</version>
         </dependency>
 
         <dependency>
diff --git a/ruby/cucumber-html-formatter.gemspec b/ruby/cucumber-html-formatter.gemspec
index abf89452..ec70b8ad 100644
--- a/ruby/cucumber-html-formatter.gemspec
+++ b/ruby/cucumber-html-formatter.gemspec
@@ -12,8 +12,8 @@ Gem::Specification.new do |s|
   s.homepage    = 'https://github.com/cucumber/html-formatter'
   s.platform    = Gem::Platform::RUBY
   s.license     = 'MIT'
-  s.required_ruby_version = '>= 2.6'
-  s.required_rubygems_version = '>= 3.0.3'
+  s.required_ruby_version = '>= 3.1'
+  s.required_rubygems_version = '>= 3.2.8'
 
   s.metadata = {
     'bug_tracker_uri' => 'https://github.com/cucumber/html-formatter/issues',
@@ -24,13 +24,13 @@ Gem::Specification.new do |s|
     'source_code_uri' => 'https://github.com/cucumber/html-formatter'
   }
 
-  s.add_runtime_dependency 'cucumber-messages', '> 19', '< 28'
+  s.add_runtime_dependency 'cucumber-messages', '> 19', '< 31'
 
-  s.add_development_dependency 'rake', '~> 13.2'
+  s.add_development_dependency 'rake', '~> 13.3'
   s.add_development_dependency 'rspec', '~> 3.13'
-  s.add_development_dependency 'rubocop', '~> 1.71.0'
+  s.add_development_dependency 'rubocop', '~> 1.81.0'
   s.add_development_dependency 'rubocop-rake', '~> 0.6.0'
-  s.add_development_dependency 'rubocop-rspec', '~> 2.31.0'
+  s.add_development_dependency 'rubocop-rspec', '~> 3.7.0'
 
   s.executables      = ['cucumber-html-formatter']
   s.files            = Dir['README.md', 'LICENSE', 'lib/**/*', 'assets/*']
diff --git a/ruby/lib/cucumber/html_formatter/formatter.rb b/ruby/lib/cucumber/html_formatter/formatter.rb
index 3d7243aa..77a77073 100644
--- a/ruby/lib/cucumber/html_formatter/formatter.rb
+++ b/ruby/lib/cucumber/html_formatter/formatter.rb
@@ -25,7 +25,7 @@ def write_message(message)
         out.puts(',') unless @first_message
         # Replace < with \x3C
         # https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements
-        out.print(message.to_json.gsub('<', "\\x3C"))
+        out.print(message.to_json.gsub('<', '\\x3C'))
 
         @first_message = false
       end
@@ -53,7 +53,7 @@ def pre_message
           AssetsLoader.css,
           template_writer.write_between('{{css}}', '{{custom_css}}'),
           template_writer.write_between('{{custom_css}}', '{{messages}}')
-        ].join("")
+        ].join('')
       end
 
       def post_message
@@ -62,7 +62,7 @@ def post_message
           AssetsLoader.script,
           template_writer.write_between('{{script}}', '{{custom_script}}'),
           template_writer.write_between('{{custom_script}}', nil)
-        ].join("")
+        ].join('')
       end
 
       def template_writer
diff --git a/ruby/spec/cucumber/html_formatter/formatter_spec.rb b/ruby/spec/cucumber/html_formatter/formatter_spec.rb
index 8919ec5d..458e2b7f 100644
--- a/ruby/spec/cucumber/html_formatter/formatter_spec.rb
+++ b/ruby/spec/cucumber/html_formatter/formatter_spec.rb
@@ -103,7 +103,7 @@
     expect(out.string).to match(/\A<!DOCTYPE html>\s?<html/)
     expect(out.string).to include("window.CUCUMBER_MESSAGES = [\n];")
     expect(out.string).to match(/<\/html>\Z/)
-    
+
   end
 
   it 'writes an empty report' do
@@ -115,6 +115,6 @@
     expect(out.string).to match(/\A<!DOCTYPE html>\s?<html/)
     expect(out.string).to include("window.CUCUMBER_MESSAGES = [\n{\"testRunStarted\":{\"timestamp\":{\"seconds\":10,\"nanos\":0}}},\n{\"testRunFinished\":{\"success\":false,\"timestamp\":{\"seconds\":15,\"nanos\":0}}}];")
     expect(out.string).to match(/<\/html>\Z/)
-    
+
   end
 end