diff --git a/ixbrl.gemspec b/ixbrl.gemspec
index a58d937..b621fa3 100644
--- a/ixbrl.gemspec
+++ b/ixbrl.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_runtime_dependency 'nokogiri', '>= 1.7', '< 1.10'
-  spec.add_runtime_dependency 'elasticsearch', '>= 5.0', '< 6.2'
+  spec.add_runtime_dependency 'elasticsearch', '>= 5.0', '< 7.9'
   spec.add_runtime_dependency 'rubyzip', '>= 1.0.0'
   spec.add_runtime_dependency 'parallel'