diff --git a/lib/cocoapods-downloader/git.rb b/lib/cocoapods-downloader/git.rb
index a247644..526563e 100644
--- a/lib/cocoapods-downloader/git.rb
+++ b/lib/cocoapods-downloader/git.rb
@@ -5,7 +5,7 @@ module Downloader
     #
     class Git < Base
       def self.options
-        [:commit, :tag, :branch, :submodules]
+        [:checkout,:commit, :tag, :branch, :submodules]
       end
 
       def options_specific?
@@ -16,6 +16,7 @@ def checkout_options
         options = {}
         options[:git] = url
         options[:commit] = target_git('rev-parse', 'HEAD').chomp
+        options[:checkout] = target_git_MR()
         options[:submodules] = true if self.options[:submodules]
         options
       end
@@ -72,6 +73,7 @@ def self.commit_from_ls_remote(output, branch_name)
       def download!
         clone
         checkout_commit if options[:commit]
+        target_git_MR if options[:checkout]
       end
 
       # @return [void] Checks out the HEAD of the git source in the destination
@@ -165,6 +167,14 @@ def validate_input
         invalid = input.compact.any? { |value| value.start_with?('--') || value.include?(' --') }
         raise DownloaderError, "Provided unsafe input for git #{options}." if invalid
       end
+      
+      #Checkout to pull requests with :checkout=>..
+      def target_git_MR(*args)
+        if options[:checkout]
+          git!(['-C', target_path, 'fetch', 'origin', options[:checkout],'--update-head-ok'])
+          git!(['-C', target_path, 'checkout', options[:checkout].split("head:")[-1]])
+        end
+      end
     end
   end
 end