diff --git a/cyclonedx-ruby.gemspec b/cyclonedx-ruby.gemspec
index 087712e..f7a13a7 100644
--- a/cyclonedx-ruby.gemspec
+++ b/cyclonedx-ruby.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency('json', '~> 2.6')
   spec.add_dependency('nokogiri', '~> 1.15')
-  spec.add_dependency('ostruct', '~> 0.5.5')
+  spec.add_dependency('ostruct', '>= 0.5.5', '< 0.7.0')
   spec.add_dependency('rest-client', '~> 2.0')
   spec.add_dependency('activesupport', '~> 7.0')
   spec.add_development_dependency 'rake', '~> 13'