diff --git a/gon.gemspec b/gon.gemspec
index 676d7d4..f3ce904 100644
--- a/gon.gemspec
+++ b/gon.gemspec
@@ -20,6 +20,9 @@ Gem::Specification.new do |s|
   s.add_dependency 'i18n', '>= 0.7'
   s.add_dependency 'request_store', '>= 1.0'
   s.add_dependency 'multi_json'
+  if RUBY_VERSION >= '3.5.0'
+    s.add_dependency 'ostruct'
+  end
   s.add_development_dependency 'rabl', '0.11.3'
   s.add_development_dependency 'rabl-rails'
   s.add_development_dependency 'rspec', '>= 3.0'