RAILS : Bundler could not find compatible versions for gem "actionpack" on installing ActiveAdmin

Question

I added gem 'activeadmin', github: 'activeadmin' in my gemfile and did a bundle install. Then it's throwing me the following error.

Bundler could not find compatible versions for gem "actionpack":
   In snapshot (Gemfile.lock):
     actionpack (= 5.0.0.1)

In Gemfile:
activeadmin (~> 1.0.0.pre4) was resolved to 1.0.0.pre4, which depends on
  formtastic (~> 3.1) was resolved to 3.1.4, which depends on
    actionpack (>= 3.2.13)

activeadmin (~> 1.0.0.pre4) was resolved to 1.0.0.pre4, which depends on
  inherited_resources (~> 1.6) was resolved to 1.6.0, which depends on
    actionpack (< 5, >= 3.2)

activeadmin (~> 1.0.0.pre4) was resolved to 1.0.0.pre4, which depends on
  inherited_resources (~> 1.6) was resolved to 1.6.0, which depends on
    actionpack (< 5, >= 3.2)

activeadmin (~> 1.0.0.pre4) was resolved to 1.0.0.pre4, which depends on
  kaminari (~> 0.15) was resolved to 0.17.0, which depends on
    actionpack (>= 3.0.0)

activeadmin (~> 1.0.0.pre4) was resolved to 1.0.0.pre4, which depends on
  ransack (~> 1.3) was resolved to 1.8.2, which depends on
    actionpack (>= 3.0)

Running bundle update will rebuild your snapshot from scratch, using only the gems in your Gemfile, which may resolve the conflict.

I did the bundle update, but still the error is the same. Any help would be appreciated.

EDIT

gem 'activeadmin' is not compatible with rails 5

Answer 1

This solution worked for me. For rails 5 you would have to add another gem as follows:

gem 'activeadmin', github: 'activeadmin'
gem 'inherited_resources', github: 'activeadmin/inherited_resources'

To read further, go to this thread.

Answer 2

You have to install inherited resources gem with active admin in rails 5

gem 'activeadmin', github: 'activeadmin'
gem 'inherited_resources', github: 'activeadmin/inherited_resources'