diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 9d86139..2d225b7 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "fluentd", "~> 0.10.56"
+  spec.add_dependency "fluentd", [">= 0.10.56", "< 2"]
   spec.add_dependency 'rails', '~> 4.1.7'
   spec.add_dependency 'sucker_punch', "~> 1.0.5"
   spec.add_dependency 'addressable'