Unable to update/install TrueTime on Objective C project through Cocoapods

I am using Truetime for quite a time. Recently I updated my xcode to 10.2 which required updating the pods with Swift 3.
When I run pod update, all pods get updated except TrueTime. And this error comes up
>
> - `Result` does not specify a Swift version and none of the targets (`MY_APP_NAME`) integrating it have the `SWIFT_VERSION` attribute set. Please contact the author or set the `SWIFT_VERSION` attribute in at least one of the targets that integrate this pod.
> - `TrueTime` does not specify a Swift version and none of the targets (`MY_APP_NAME`) integrating it have the `SWIFT_VERSION` attribute set. Please contact the author or set the `SWIFT_VERSION` attribute in at least one of the targets that integrate this pod.

Also I have tested it on a new project but it gives same issue.
Please note that this issue comes up only on Objective C projects and not on Swift projects.