relaton_cie.gemspec in relaton-cie-1.8.0 vs relaton_cie.gemspec in relaton-cie-1.9.0

@@ -14,11 +14,11 @@
     RelatonEcma: retrieve CIE Standards for bibliographic use 
     using the BibliographicItem model.
   DESCRIPTION
   spec.homepage      = "https://github.com/metanorma/relaton-cie"
   spec.license       = "BSD-2-Clause"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.4.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
 
   spec.metadata["homepage_uri"] = spec.homepage
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
@@ -27,17 +27,15 @@
   end
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  # 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 "ruby-debug-ide"
   spec.add_development_dependency "ruby-jing"
   spec.add_development_dependency "simplecov"
   spec.add_development_dependency "vcr"
   spec.add_development_dependency "webmock"
 
-  spec.add_dependency "relaton-bib", "~> 1.8.0"
+  spec.add_dependency "relaton-bib", "~> 1.9.0"
 end