diff --git a/minfraud.gemspec b/minfraud.gemspec
index d9b2670..eafb6f0 100644
--- a/minfraud.gemspec
+++ b/minfraud.gemspec
@@ -24,8 +24,10 @@ Gem::Specification.new do |spec|
   }
   spec.required_ruby_version = '>= 3.2'
 
-  spec.files = Dir['**/*'].difference(Dir['CLAUDE.md', 'CODE_OF_CONDUCT.md', 'dev-bin/**/*', 'Gemfile*', 'Rakefile', 'README.dev.md',
-                                          'spec/**/*', '*.gemspec'])
+  excluded   = Dir['.github/**/*', '.gitignore', '.rspec', '.rubocop.yml', 'lychee.toml',
+                   'mise.lock', 'mise.toml', 'CLAUDE.md', 'CODE_OF_CONDUCT.md', 'dev-bin/**/*',
+                   'Gemfile*', 'Rakefile', 'README.dev.md', 'spec/**/*', '*.gemspec']
+  spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL, &:read).split("\x0").difference(excluded)
 
   spec.add_dependency 'connection_pool', '>= 2.2', '< 4.0'
   spec.add_dependency 'http', '>= 4.3', '< 6.0'