diff --git a/sensu-plugins-opsgenie.gemspec b/sensu-plugins-opsgenie.gemspec
index 2f5546e..41812b3 100644
--- a/sensu-plugins-opsgenie.gemspec
+++ b/sensu-plugins-opsgenie.gemspec
@@ -31,7 +31,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
 
   s.add_runtime_dependency 'sensu-plugin', '~> 4.0'
 
-  s.add_development_dependency 'bundler',                   '~> 1.7'
+  s.add_development_dependency 'bundler',                   '~> 2.1'
   s.add_development_dependency 'codeclimate-test-reporter', '~> 0.4'
   s.add_development_dependency 'github-markup',             '~> 1.3'
   s.add_development_dependency 'kitchen-docker',            '~> 2.6'