usable.gemspec in usable-3.9.1 vs usable.gemspec in usable-3.9.2

@@ -19,10 +19,10 @@
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
   spec.required_ruby_version = '>= 2.0.0'
 
-  spec.add_development_dependency 'bundler', '~> 1.10'
+  spec.add_development_dependency 'bundler', '~> 2'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '>= 3.2', '< 4'
   # spec.add_development_dependency 'rspec-scaffold', '>= 1.0', '< 2'
 end