diff --git a/naver-searchad-api.gemspec b/naver-searchad-api.gemspec
index e00a702..cc22c3d 100644
--- a/naver-searchad-api.gemspec
+++ b/naver-searchad-api.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'httpclient', '>= 2.8.1', '< 3.0'
   spec.add_runtime_dependency 'addressable', '~> 2.5'
 
-  spec.add_development_dependency 'bundler', '~> 1.14'
+  spec.add_development_dependency 'bundler', '~> 2.2'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'simplecov', '~> 0.14'