--- a/mercenary.gemspec
+++ b/mercenary.gemspec
@@ -14,9 +14,7 @@
   spec.homepage      = "https://github.com/jekyll/mercenary"
   spec.license       = "MIT"
 
-  spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
-  spec.executables   = spec.files.grep(%r!^bin/!) { |f| File.basename(f) }
-  spec.test_files    = spec.files.grep(%r!^(test|spec|features)/!)
+  spec.files         = Dir["lib/**/*"]
   spec.require_paths = ["lib"]
 
   spec.required_ruby_version = ">= 2.4.0"