ActiveAdmin recently reached version 2.0.0. The theme still works correctly with the new version but the dependency in gemspec is too strict.
This PR loosens the depenency limit.
lol 😄
Sorry for replying so late @filippoliverani. Thank you for your PR.
In the end I preferred to update the Active Admin version dependency to 2.X
ActiveAdmin recently reached version 2.0.0. The theme still works correctly with the new version but the dependency in gemspec is too strict. This PR loosens the depenency limit.