diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7f907097..7cfc9a10 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.7']
+        ruby: ['2.7', '3.3']
 
     steps:
       - name: Checkout
diff --git a/.rubocop.yml b/.rubocop.yml
index 4d06aa98..9c5e0819 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -11,6 +11,7 @@ AllCops:
     - 'spec/fixtures/**/*'
     - 'tmp/**/*'
     - 'spec/integration/**/*'
+    - 'Guardfile'
   NewCops: enable
 
 Metrics/BlockLength:
diff --git a/Gemfile b/Gemfile
index 0998ee0d..10daacfe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,6 @@ gem 'rake', require: false
 group :development do
   gem 'bump'
   gem 'mg', require: false
-  gem 'travis', require: false
   platforms :mri, :mingw do
     gem 'yard', require: false
   end
@@ -29,7 +28,6 @@ group :development, :test do
   gem 'coveralls'
 
   gem 'overcommit'
-  gem 'ruby_dep', '1.5.0'
 
   platforms :mri, :mingw do
     gem 'pry', require: false
@@ -38,6 +36,5 @@ group :development, :test do
 end
 
 group :test do
-  gem 'files', require: false
   gem 'git', require: false
 end
diff --git a/spec/lib/annotate/annotate_models_spec.rb b/spec/lib/annotate/annotate_models_spec.rb
index 09647461..e62a3244 100644
--- a/spec/lib/annotate/annotate_models_spec.rb
+++ b/spec/lib/annotate/annotate_models_spec.rb
@@ -3,7 +3,7 @@
 require 'annotate/annotate_models'
 require 'annotate/active_record_patch'
 require 'active_support/core_ext/string'
-require 'files'
+require 'pathname'
 require 'tmpdir'
 
 describe AnnotateModels do
@@ -2014,18 +2014,16 @@ def mock_column(name, type, options = {})
 
     context 'when `model_dir` is valid' do
       let(:model_dir) do
-        Files do
-          file 'foo.rb'
-          dir 'bar' do
-            file 'baz.rb'
-            dir 'qux' do
-              file 'quux.rb'
-            end
-          end
-          dir 'concerns' do
-            file 'corge.rb'
-          end
-        end
+        dir = Pathname(Dir.mktmpdir('annotate_models'))
+        dir.join('bar').mkdir
+        dir.join('bar', 'qux').mkdir
+        dir.join('concerns').mkdir
+
+        dir.join('foo.rb').write('')
+        dir.join('bar', 'baz.rb').write('')
+        dir.join('bar', 'qux', 'quux.rb').write('')
+        dir.join('concerns', 'corge.rb').write('')
+        dir
       end
 
       context 'when the model files are not specified' do