diff --git a/naver-searchad-api.gemspec b/naver-searchad-api.gemspec
index e00a702..e7a8714 100644
--- a/naver-searchad-api.gemspec
+++ b/naver-searchad-api.gemspec
@@ -28,5 +28,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'simplecov', '~> 0.14'
-  spec.add_development_dependency 'webmock', '~> 2.1'
+  spec.add_development_dependency 'webmock', '~> 3.11'
 end