swift_version = 4.0

CryptoSwift.podspec

@@ -8,6 +8,7 @@ Pod::Spec.new do |s|
   s.license      = {:type => "Attribution License", :file => "LICENSE"}
   s.authors      = {'Marcin Krzyżanowski' => 'marcin@krzyzanowskim.com'}
   s.social_media_url   = "https://twitter.com/krzyzanowskim"
+  s.swift_version = "4.0"
   s.ios.deployment_target = "8.0"
   s.osx.deployment_target = "10.9"
   s.watchos.deployment_target = "2.0"