I keep getting this error whenever I try doing flutter pub get

[kcibdev]

Everything I try to install tripledes: ^2.1.0 I keep getting the error

Because no versions of tripledes match 2.1.0 and no versions of tripledes match >2.1.0 <3.0.0, tripledes ^2.1.0 is forbidden.
So, because **** depends on tripledes ^2.1.0, version solving failed.
pub get failed (1; So, because **** depends on tripledes ^2.1.0, version solving failed.)

It happens every single times and i dont know what to Cause am trying to use rave_flutter: ^0.0.9-alpha+2 which depends on tripledes and its not working because of this error.
What is the problem

This are my depencies:

dependencies:
google_sign_in: ^4.5.6
firebase_auth:
provider: ^4.3.2+3
flutter_switch: ^0.2.0
cached_network_image: ^2.5.0
shared_preferences: ^0.5.12+4
image_picker: ^0.6.7+17
flutter_image_compress: ^0.7.0
image_cropper: ^1.3.1
intl: ^0.16.1
http: ^0.12.2
transparent_image: ^1.0.0
country_state_city_picker: ^1.2.7
animations: ^1.1.2
smooth_star_rating: ^1.1.1
csc_picker: ^0.0.4
firebase_core: ^0.7.0
rave_flutter: ^0.0.9-alpha+2
async: ^2.4.2
dio: ^3.0.10
equatable: ^1.2.5
flutter_svg: ^0.19.2+1
get_it: ^5.0.2
meta: ^1.2.4
tripledes: ^2.1.0
webview_flutter: ^1.0.7
flutter:
sdk: flutter