diff --git a/rubygem/ejson2env.gemspec b/rubygem/ejson2env.gemspec
index 6c6c513..d558ab2 100644
--- a/rubygem/ejson2env.gemspec
+++ b/rubygem/ejson2env.gemspec
@@ -17,4 +17,5 @@ Gem::Specification.new do |spec|
   spec.executables   = ["ejson2env"]
   spec.test_files    = []
   spec.require_paths = ["lib"]
+  spec.metadata["rubygems_mfa_required"] = "true"
 end