title: How to change the version of a Cocoapod's dependency
body: <p>I am using a Cocoapod whose <code>podspec</code> specifies a dependency, and this dependency in turn specifies another.</p>
  
  <p>The second-level dependency in question has a conflict with the latest beta version of Xcode 9.  The issue has been fixed in the project's github but it has not appeared on Cocoapods yet.</p>
  
  <p>But the dependency itself of course does not appear in my Podfile.</p>
  
  <p>Is there an easy way to force the use of a specific version of the dependency in this case?</p>