valigator-csv.gemspec in valigator-csv-3.0 vs valigator-csv.gemspec in valigator-csv-4.0

@@ -17,10 +17,10 @@
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features|bin)/}) }
   spec.bindir        = "bin"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '>= 2.1'
+  spec.required_ruby_version = '>= 2.3.8'
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec"
 end