diff --git a/hermod.gemspec b/hermod.gemspec
index ca67665..4fd00d6 100644
--- a/hermod.gemspec
+++ b/hermod.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 3.0"
 
-  spec.add_runtime_dependency "libxml-ruby", "~> 4.1"
+  spec.add_runtime_dependency "libxml-ruby", ">= 4.1", "< 6.0"
   spec.add_runtime_dependency "activesupport", "> 3.2"
 
   spec.add_development_dependency "bundler", "~> 2.0"