diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index aa1f1a9..05ce69d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,6 +16,8 @@ jobs:
           - '2.7.6'
           - '3.0.7'
           - '3.1.7'
+          - '3.3.12'
+          - '3.4.11'
         include:
           - ruby: '2.7.6'
             gemfile: gemfiles/ruby_2.7.gemfile
@@ -23,6 +25,10 @@ jobs:
             gemfile: gemfiles/ruby_3.0.gemfile
           - ruby: '3.1.7'
             gemfile: gemfiles/ruby_3.1.gemfile
+          - ruby: '3.3.12'
+            gemfile: gemfiles/ruby_3.3.gemfile
+          - ruby: '3.4.11'
+            gemfile: gemfiles/ruby_3.4.gemfile
 
     env:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
diff --git a/gemfiles/ruby_3.3.gemfile b/gemfiles/ruby_3.3.gemfile
new file mode 100644
index 0000000..97ce826
--- /dev/null
+++ b/gemfiles/ruby_3.3.gemfile
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gemspec path: '..'
+
+gem 'bundler', '~> 2.0'
+gem 'bundler-audit', '~> 0.9.0'
+gem 'overcommit', '~> 0.60.0'
+gem 'rake', '~> 13.0'
+gem 'rspec', '~> 3.0'
+gem 'rubocop', '~> 1.50.0'
diff --git a/gemfiles/ruby_3.4.gemfile b/gemfiles/ruby_3.4.gemfile
new file mode 100644
index 0000000..6d3472b
--- /dev/null
+++ b/gemfiles/ruby_3.4.gemfile
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gemspec path: '..'
+
+gem 'bundler', '~> 2.0'
+gem 'bundler-audit', '~> 0.9.0'
+gem 'overcommit', '~> 0.60.0'
+gem 'rake', '~> 13.0'
+gem 'rspec', '~> 3.0'
+gem 'rubocop', '~> 1.50.0'
+
+# Ruby 3.4: stdlib default gem; needed by rubocop stack
+gem 'base64', '>= 0.2'