diff --git a/Manifest.txt b/Manifest.txt
new file mode 100644
index 000000000..44f4ab611
--- /dev/null
+++ b/Manifest.txt
@@ -0,0 +1,128 @@
+lib/aruba
+lib/aruba.rb
+lib/aruba/api
+lib/aruba/api.rb
+lib/aruba/api/bundler.rb
+lib/aruba/api/commands.rb
+lib/aruba/api/core.rb
+lib/aruba/api/environment.rb
+lib/aruba/api/filesystem.rb
+lib/aruba/api/text.rb
+lib/aruba/aruba_path.rb
+lib/aruba/basic_configuration
+lib/aruba/basic_configuration.rb
+lib/aruba/basic_configuration/option.rb
+lib/aruba/cli.rb
+lib/aruba/colorizer.rb
+lib/aruba/command.rb
+lib/aruba/config
+lib/aruba/config/jruby.rb
+lib/aruba/config_wrapper.rb
+lib/aruba/configuration.rb
+lib/aruba/console
+lib/aruba/console.rb
+lib/aruba/console/help.rb
+lib/aruba/contracts
+lib/aruba/contracts/absolute_path.rb
+lib/aruba/contracts/enum.rb
+lib/aruba/contracts/is_power_of_two.rb
+lib/aruba/contracts/relative_path.rb
+lib/aruba/cucumber
+lib/aruba/cucumber.rb
+lib/aruba/cucumber/command.rb
+lib/aruba/cucumber/environment.rb
+lib/aruba/cucumber/file.rb
+lib/aruba/cucumber/hooks.rb
+lib/aruba/cucumber/testing_frameworks.rb
+lib/aruba/errors.rb
+lib/aruba/event_bus
+lib/aruba/event_bus.rb
+lib/aruba/event_bus/name_resolver.rb
+lib/aruba/events.rb
+lib/aruba/extensions
+lib/aruba/extensions/string
+lib/aruba/extensions/string/strip.rb
+lib/aruba/file_size.rb
+lib/aruba/generators
+lib/aruba/generators/script_file.rb
+lib/aruba/hooks.rb
+lib/aruba/in_config_wrapper.rb
+lib/aruba/initializer.rb
+lib/aruba/matchers
+lib/aruba/matchers/base
+lib/aruba/matchers/base/base_matcher.rb
+lib/aruba/matchers/base/message_indenter.rb
+lib/aruba/matchers/base/object_formatter.rb
+lib/aruba/matchers/collection
+lib/aruba/matchers/collection.rb
+lib/aruba/matchers/collection/all.rb
+lib/aruba/matchers/collection/include_an_object.rb
+lib/aruba/matchers/command
+lib/aruba/matchers/command.rb
+lib/aruba/matchers/command/be_successfully_executed.rb
+lib/aruba/matchers/command/have_exit_status.rb
+lib/aruba/matchers/command/have_finished_in_time.rb
+lib/aruba/matchers/command/have_output.rb
+lib/aruba/matchers/command/have_output_on_stderr.rb
+lib/aruba/matchers/command/have_output_on_stdout.rb
+lib/aruba/matchers/command/have_output_size.rb
+lib/aruba/matchers/directory
+lib/aruba/matchers/directory.rb
+lib/aruba/matchers/directory/be_an_existing_directory.rb
+lib/aruba/matchers/directory/have_sub_directory.rb
+lib/aruba/matchers/environment.rb
+lib/aruba/matchers/file
+lib/aruba/matchers/file.rb
+lib/aruba/matchers/file/be_a_command_found_in_path.rb
+lib/aruba/matchers/file/be_an_existing_executable.rb
+lib/aruba/matchers/file/be_an_existing_file.rb
+lib/aruba/matchers/file/have_file_content.rb
+lib/aruba/matchers/file/have_file_size.rb
+lib/aruba/matchers/file/have_same_file_content.rb
+lib/aruba/matchers/path
+lib/aruba/matchers/path.rb
+lib/aruba/matchers/path/a_path_matching_pattern.rb
+lib/aruba/matchers/path/be_an_absolute_path.rb
+lib/aruba/matchers/path/be_an_existing_path.rb
+lib/aruba/matchers/path/have_permissions.rb
+lib/aruba/matchers/string
+lib/aruba/matchers/string.rb
+lib/aruba/matchers/string/include_output_string.rb
+lib/aruba/matchers/string/match_output_string.rb
+lib/aruba/matchers/string/output_string_eq.rb
+lib/aruba/platform.rb
+lib/aruba/platforms
+lib/aruba/platforms/announcer.rb
+lib/aruba/platforms/aruba_file_creator.rb
+lib/aruba/platforms/aruba_fixed_size_file_creator.rb
+lib/aruba/platforms/aruba_logger.rb
+lib/aruba/platforms/command_monitor.rb
+lib/aruba/platforms/determine_disk_usage.rb
+lib/aruba/platforms/determine_file_size.rb
+lib/aruba/platforms/filesystem_status.rb
+lib/aruba/platforms/local_environment.rb
+lib/aruba/platforms/simple_table.rb
+lib/aruba/platforms/unix_command_string.rb
+lib/aruba/platforms/unix_environment_variables.rb
+lib/aruba/platforms/unix_platform.rb
+lib/aruba/platforms/unix_which.rb
+lib/aruba/platforms/windows_command_string.rb
+lib/aruba/platforms/windows_environment_variables.rb
+lib/aruba/platforms/windows_platform.rb
+lib/aruba/platforms/windows_which.rb
+lib/aruba/processes
+lib/aruba/processes/basic_process.rb
+lib/aruba/processes/debug_process.rb
+lib/aruba/processes/in_process.rb
+lib/aruba/processes/spawn_process.rb
+lib/aruba/rspec.rb
+lib/aruba/runtime.rb
+lib/aruba/setup.rb
+lib/aruba/tasks
+lib/aruba/tasks/docker_helpers.rb
+lib/aruba/version.rb
+exe/aruba
+CHANGELOG.md
+CONTRIBUTING.md
+LICENSE
+README.md
diff --git a/Rakefile b/Rakefile
index fc56da43c..56480873a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -47,6 +47,15 @@ end
 
 Bundler::GemHelper.install_tasks
 
+require 'rake/manifest/task'
+
+Rake::Manifest::Task.new do |t|
+  t.patterns = ['lib/**/*', 'exe/*', 'CHANGELOG.md', 'CONTRIBUTING.md',
+                'LICENSE', 'README.md']
+end
+
+task build: 'manifest:check'
+
 namespace :docker do
   desc 'Build docker image'
   task :build, :cache, :version do |_, args|
diff --git a/aruba.gemspec b/aruba.gemspec
index 50690ab43..2090cd2e3 100644
--- a/aruba.gemspec
+++ b/aruba.gemspec
@@ -1,7 +1,4 @@
-lib = ::File.expand_path('lib', __dir__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'aruba/version'
-require 'rake/file_list'
+require_relative 'lib/aruba/version'
 
 Gem::Specification.new do |spec|
   spec.name        = 'aruba'
@@ -36,6 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'minitest', '~> 5.10'
   spec.add_development_dependency 'pry-doc', '~> 1.0'
   spec.add_development_dependency 'rake', '~> 13.0'
+  spec.add_development_dependency 'rake-manifest', '~> 0.1.0'
   spec.add_development_dependency 'rspec', '~> 3.6'
   spec.add_development_dependency 'rubocop', '~> 0.88.0'
   spec.add_development_dependency 'rubocop-packaging', '~> 0.1.1'
@@ -47,8 +45,7 @@ Gem::Specification.new do |spec|
   spec.rubygems_version = '>= 1.6.1'
   spec.required_ruby_version = '>= 2.4'
 
-  spec.files = Rake::FileList['{docs,fixtures,lib}/**/*', 'CHANGELOG.md', \
-                              'LICENSE', 'README.md'].exclude(*File.read('.gitignore').split)
+  spec.files = File.read('Manifest.txt').split
 
   spec.executables      = ['aruba']
   spec.rdoc_options     = ['--charset', 'UTF-8', '--main', 'README.md']