writeexcel.gemspec in writeexcel-1.0.6 vs writeexcel.gemspec in writeexcel-1.0.7

@@ -3,11 +3,11 @@
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'writeexcel/version'
 
 Gem::Specification.new do |gem|
   gem.name          = "writeexcel"
-  gem.version       = WriteExcel::VERSION
+  gem.version       = Writeexcel::VERSION
   gem.authors       = ["Hideo NAKAMURA"]
   gem.email         = ["[e-mail]"]
   gem.description   = "Multiple worksheets can be added to a workbook and formatting can be applied to cells. Text, numbers, formulas, hyperlinks and images can be written to the cells."
   gem.summary       = "Write to a cross-platform Excel binary file."
   gem.homepage      = "http://github.com/cxn03651/writeexcel#readme"
@@ -15,10 +15,12 @@
 
   gem.files         = `git ls-files`.split($/)
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
+  gem.required_ruby_version = '>= 2.4.0'
   gem.add_development_dependency 'minitest'
+  gem.add_runtime_dependency 'racc' if RUBY_VERSION >= '3.3'
   gem.add_development_dependency 'rake'
   gem.extra_rdoc_files = [
     "LICENSE.txt",
     "README.rdoc"
   ]