diff --git a/twine.gemspec b/twine.gemspec
index b32ca05..65ba71f 100644
--- a/twine.gemspec
+++ b/twine.gemspec
@@ -21,6 +21,7 @@ Gem::Specification.new do |s|
   s.required_ruby_version = ">= 2.4"
   s.add_runtime_dependency('rubyzip', "~> 2.0")
   s.add_runtime_dependency('safe_yaml', "~> 1.0")
+  s.add_runtime_dependency('rexml', "~> 3.1")
   s.add_development_dependency('rake', "~> 13.0")
   s.add_development_dependency('minitest', "~> 5.5")
   s.add_development_dependency('minitest-ci', "~> 3.0")