relaton_iso_bib.gemspec in relaton-iso-bib-1.8.1 vs relaton_iso_bib.gemspec in relaton-iso-bib-1.9.0

@@ -22,19 +22,19 @@
     `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   end
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.4.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
 
   # spec.add_development_dependency "debase"
   spec.add_development_dependency "equivalent-xml", "~> 0.6"
   spec.add_development_dependency "pry-byebug"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.0"
   # spec.add_development_dependency "ruby-debug-ide"
   spec.add_development_dependency "ruby-jing"
   spec.add_development_dependency "simplecov"
 
   spec.add_dependency "isoics", "~> 0.1.6"
-  spec.add_dependency "relaton-bib", "~> 1.8.0"
+  spec.add_dependency "relaton-bib", "~> 1.9.0"
 end