diff --git a/ridgepole.gemspec b/ridgepole.gemspec
index 40897ee5..a2a7fe37 100644
--- a/ridgepole.gemspec
+++ b/ridgepole.gemspec
@@ -14,9 +14,12 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/ridgepole/ridgepole'
   spec.license       = 'MIT'
 
-  spec.files         = `git ls-files -z`.split("\x0")
+  spec.files = Dir.chdir(File.expand_path(__dir__)) do
+    `git ls-files -z`.split("\x0").reject do |f|
+      f.match(%r{\A(?:(?:test|spec|features)/|\.(?:git|travis|circleci)|appveyor)})
+    end
+  end
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
-  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
   spec.required_ruby_version = Gem::Requirement.new('>= 2.2.7') # rubocop:disable Gemspec/RequiredRubyVersion