CocoaPods use locally modified Pods

I would like to use an existing pod, modify it to fit my needs and finally use it in my Podfile. So far for the pod I did : - edit the code - commit the new code into a new branch - remove the github origin in the pod's podsspec - specify the new branch in my podfile with `:branch` Now I'm stuck because I cannot get CocoaPods to checkout the modified pod. I tried with :git => 'file:///vendor_custom/test' but it doesn't seems to take into account a relative path. I also copied the .git content and changed it to bare repository type. No luck. Any pointers? Thanks