turns out podspec does not support such syntax

Author: A2K

JSONWebToken.podspec

@@ -11,7 +11,7 @@ Pod::Spec.new do |spec|
   spec.ios.deployment_target = '7.0'
   spec.osx.deployment_target = '10.9'
   spec.requires_arc = true
-  spec.dependency 'CryptoSwift', '0.0.10', :git => 'https://github.com/A2K/CryptoSwift'
+  spec.dependency 'CryptoSwift', '0.0.10'
   spec.module_name = 'JWT'
 end