diff --git a/ixbrl.gemspec b/ixbrl.gemspec
index a58d937..57f42e8 100644
--- a/ixbrl.gemspec
+++ b/ixbrl.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   end
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency 'nokogiri', '>= 1.7', '< 1.10'
+  spec.add_runtime_dependency 'nokogiri', '>= 1.7', '< 1.11'
   spec.add_runtime_dependency 'elasticsearch', '>= 5.0', '< 6.2'
   spec.add_runtime_dependency 'rubyzip', '>= 1.0.0'
   spec.add_runtime_dependency 'parallel'