diff --git a/guard-rubocop.gemspec b/guard-rubocop.gemspec
index ed35164..0ae2ca5 100644
--- a/guard-rubocop.gemspec
+++ b/guard-rubocop.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'guard',   '~> 2.0'
   spec.add_runtime_dependency 'rubocop', '< 2.0'
 
-  spec.add_development_dependency 'bundler',     '~> 1.3'
+  spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'guard-rspec', '>= 4.2.3', '< 5.0'
   spec.add_development_dependency 'launchy',     '~> 2.4'
   spec.add_development_dependency 'rake',        '>= 12.0'