Hello, I've checked myself for Apple the latest version available and indeed it's still 1.9.3 (dated of 23/04)... it's seems Apple take a lot of time to publish because the team confirmed it's published on their side and they wait for Apple... -_-
Team reply :
In case you are using an Apple device - at the moment we are waiting for the approval of the new version of the app from the side of Apple. The new version of the app will be available in your App store very soon. Please bear with us.
Thank you for your understanding.