issue updating squeel with active admin, polyamorous, activerecord - ruby-on-rails

Question

I've got a project that is a couple of years old (rails 4) that I'm trying to update (all for the sake of active admin's datetime select not working) -- when I comment out the need to update squeel it all updates fine; but if I uncomment out squeel so that it too updates I get these dependency issues:
Bundler could not find compatible versions for gem "activerecord":
In Gemfile:
acts-as-taggable-on was resolved to 4.0.0, which depends on
activerecord (>= 4.0)
annotate was resolved to 2.7.1, which depends on
activerecord (< 6.0, >= 3.2)
friendly_id (~> 5.1.0) was resolved to 5.1.0, which depends on
activerecord (>= 4.0.0)
pg_search was resolved to 1.0.6, which depends on
activerecord (>= 3.1)
polyamorous was resolved to 1.3.1, which depends on
activerecord (>= 3.0)
polyamorous was resolved to 1.3.1, which depends on
activerecord (>= 3.0)
rails (~> 4.2.1) was resolved to 4.2.1, which depends on
activerecord (= 4.2.1)
rails-erd was resolved to 1.4.7, which depends on
activerecord (>= 3.2)
random_record was resolved to 0.0.8, which depends on
activerecord (>= 3.0.0)
squeel was resolved to 0.5.0, which depends on
activerecord (~> 3.1.0.alpha)
Bundler could not find compatible versions for gem "polyamorous":
In Gemfile:
polyamorous
ransack was resolved to 1.8.1, which depends on
polyamorous (~> 1.3)
squeel was resolved to 0.8.10, which depends on
polyamorous (~> 0.5.0)
Bundler could not find compatible versions for gem "sass":
In Gemfile:
bootstrap-sass (~> 3.1.1) was resolved to 3.1.1.1, which depends on
sass (~> 3.2)
activeadmin was resolved to 1.0.0.pre4, which depends on
bourbon was resolved to 4.0.0, which depends on
sass (~> 3.3)
sass-rails (~> 4.0.1) was resolved to 4.0.5, which depends on
sass (~> 3.2.2)
I've tried a few different combinations of active admin such as:
# gem 'activeadmin', '~> 1.0.0.pre2'
# gem 'activeadmin', github: 'activeadmin'
gem 'activeadmin', github: 'gregbell/active_admin'
or
# gem 'ransack', github: 'ernie/ransack'
gem 'inherited_resources', github: 'josevalim/inherited_resources'
gem 'formtastic', github: 'justinfrench/formtastic'
gem 'chosen-rails'
gem 'select2-rails'
gem 'active_admin_datetimepicker'
gem "active_admin-sortable_tree"
gem 'polyamorous', github: 'activerecord-hackery/polyamorous'
gem 'ransack', github: 'activerecord-hackery/ransack'
and
# gem "squeel" # Last officially released gem
# gem 'squeel', github: 'activerecord-hackery/squeel'
# gem "squeel", :git => "git://github.com/ernie/squeel.git" # Track git repo
But nothing seems to be working....

Answer 1

While I'm still at it (Rails 5 upgrade) you might want to try adding activeresource to your Gemfile explicitly. Like so:
gem 'activeresource', github: 'rails/activeresource'
gem 'activeadmin', github: 'activeadmin'
gem 'devise', '~> 3.4.1'
The update did work for me, at least so far, and without using additional dependencies such as ransack, draper etc. even though it is recommended to on their (ActiveAdmin's) official README.
Give it a try.