fast_excel.gemspec in fast_excel-0.3.0 vs fast_excel.gemspec in fast_excel-0.4.0

@@ -1,14 +1,14 @@
 Gem::Specification.new do |s|
   s.name        = "fast_excel"
-  s.version     = "0.3.0"
+  s.version     = "0.4.0"
   s.author      = ["Pavel Evstigneev"]
   s.email       = ["[e-mail]"]
   s.homepage    = "https://github.com/paxa/fast_excel"
   s.summary     = %q{Ultra Fast Excel Writer}
   s.description = "Wrapper for libxlsxwriter using ffi"
   s.license     = 'MIT'
-  s.required_ruby_version = '~> 2.0'
+  s.required_ruby_version = ['>= 2.0', '< 4.0']
 
   s.files       = `git ls-files`.split("\n")
   s.test_files  = []
 
   s.require_paths = ["lib"]