Require min Cocoapods version to be v1.2.0
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 1c5864d..1479720 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -34,6 +34,10 @@
     :tag => "v#{version}",
   }
 
+  # gRPC podspecs depend on fix for https://github.com/CocoaPods/CocoaPods/issues/6024,
+  # which was released in Cocoapods v1.2.0.
+  s.cocoapods_version = '>= 1.2.0'
+
   s.ios.deployment_target = '7.0'
   s.osx.deployment_target = '10.9'
   s.requires_arc = false