omml2mathml.gemspec in omml2mathml-0.0.6 vs omml2mathml.gemspec in omml2mathml-0.0.7

@@ -23,10 +23,10 @@
   spec.test_files    = `git ls-files -- {spec}/*`.split("\n")
   spec.required_ruby_version = Gem::Requirement.new(">= 2.4.0")
 
   spec.add_dependency "nokogiri", ">= 1.10.4"
 
-  spec.add_development_dependency "bundler", "~> 2.0.1"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "byebug", "~> 9.1"
   spec.add_development_dependency "equivalent-xml", "~> 0.6"
   spec.add_development_dependency "guard", "~> 2.14"
   spec.add_development_dependency "guard-rspec", "~> 4.7"
   spec.add_development_dependency "rake", "~> 12.0"