affirm.gemspec in affirm-ruby-1.1.1 vs affirm.gemspec in affirm-ruby-1.1.2

@@ -16,10 +16,10 @@
   spec.files         = `git ls-files -z`.split("\x0")
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = "~> 2.1"
+  spec.required_ruby_version = [">= 2.1", "< 4.0"]
   spec.add_dependency "faraday"
   spec.add_dependency "faraday_middleware"
   spec.add_dependency "virtus", "~> 1.0", ">= 1.0.0"
 
   spec.add_development_dependency "bundler"