--- a/process_executer.gemspec
+++ b/process_executer.gemspec
@@ -32,12 +32,7 @@ Gem::Specification.new do |spec|
   spec.metadata['changelog_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}/file/CHANGELOG.md"
 
   # Specify which files should be added to the gem when it is released.
-  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files = Dir.chdir(__dir__) do
-    `git ls-files -z`.split("\x0").reject do |f|
-      (f == __FILE__) || f.match(%r{\A(?:(?:bin|test|spec|features)/|\.(?:git|travis|circleci)|appveyor)})
-    end
-  end
+  spec.files = Dir.glob("**/*")
   spec.bindir = 'exe'
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']