pdfmonkey.gemspec in pdfmonkey-0.5.0 vs pdfmonkey.gemspec in pdfmonkey-0.6.0

@@ -20,10 +20,10 @@
   end
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.17'
+  spec.add_development_dependency 'bundler', '~> 2.2'
   spec.add_development_dependency 'coveralls', '~> 0.8'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec', '~> 3.8'
   spec.add_development_dependency 'rubocop', '~> 0.60.0'
 end