diff --git a/wechat.gemspec b/wechat.gemspec
index e3f08558..4bca9663 100644
--- a/wechat.gemspec
+++ b/wechat.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'http', '>= 1.0.4', '< 5'
   s.add_runtime_dependency 'nokogiri', '>=1.6.0'
   s.add_runtime_dependency 'thor'
-  s.add_runtime_dependency 'rubocop', '~> 0.74'
+  s.add_development_dependency 'rubocop', '~> 0.74'
   s.add_development_dependency 'rails', '>= 5.1'
   s.add_development_dependency 'rspec-rails', '~> 3.6'
   s.add_development_dependency 'sqlite3', '~> 1.4'