diff --git a/heroics.gemspec b/heroics.gemspec
index 8310c96..296dc82 100644
--- a/heroics.gemspec
+++ b/heroics.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep('^(test|spec|features)/')
   spec.require_paths = ['lib']
+  spec.metadata["rubygems_mfa_required"] = "true"
 
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'minitest', '4.7.5'