Rails Gemfile Dependencies Won't Resolve - ruby-on-rails

Question

I just updated from Rails 4.2 to Rails 5.0 and am having serious Gemfile issues. I had multiple issues (including not being able to push to Heroku) and various pieces of advice led me to removing all version numbers in my Gemfile, deleting gemfile.lock and running bundle install.
Running bundle install took over 8 hours. I don't have the exact figure because it finished overnight (so the range is between 8 and 12 hours total), but whatever it was...it was unacceptably long. After all that, I'm still getting the following unresolved dependencies:
Bundler could not find compatible versions for gem "actionpack":
In Gemfile:
rails (~> 5.0.0) was resolved to 5.0.0, which depends on
actionpack (= 5.0.0)
simple_form_extension was resolved to 1.4.10, which depends on
simple_form was resolved to 4.0.1, which depends on
actionpack (>= 5.0)
Bundler could not find compatible versions for gem "activemodel":
In Gemfile:
paperclip was resolved to 6.0.0, which depends on
activemodel (>= 4.2.0)
rails (~> 5.0.0) was resolved to 5.0.0, which depends on
activemodel (= 5.0.0)
simple_form_extension was resolved to 1.4.10, which depends on
simple_form was resolved to 4.0.1, which depends on
activemodel (>= 5.0)
Bundler could not find compatible versions for gem "activerecord":
In Gemfile:
acts-as-taggable-on was resolved to 6.0.0, which depends on
activerecord (~> 5.0)
friendly_id was resolved to 5.2.4, which depends on
activerecord (>= 4.0.0)
rails (~> 5.0.0) was resolved to 5.0.0, which depends on
activerecord (= 5.0.0)
Bundler could not find compatible versions for gem "activesupport":
In Gemfile:
paperclip was resolved to 6.0.0, which depends on
activesupport (>= 4.2.0)
rails (~> 5.0.0) was resolved to 5.0.0, which depends on
activesupport (= 5.0.0)
rename was resolved to 1.0.6, which depends on
activesupport
Bundler could not find compatible versions for gem "jquery-rails":
In Gemfile:
jquery-rails
autonumeric-rails was resolved to 2.0.0.1, which depends on
jquery-rails (>= 2.0.2)
Bundler could not find compatible versions for gem "nokogiri":
In Gemfile:
rets was resolved to 0.11.0, which depends on
nokogiri (~> 1.5)
rubillow was resolved to 0.0.8, which depends on
nokogiri (~> 1.5.0)
Bundler could not find compatible versions for gem "rails":
In Gemfile:
rails (~> 5.0.0)
Could not find gem 'rails (~> 5.0.0)' in any of the sources.
Bundler could not find compatible versions for gem "railties":
In Gemfile:
rails (~> 5.0.0) was resolved to 5.0.0, which depends on
railties (= 5.0.0)
sass-rails was resolved to 3.2.6, which depends on
railties (~> 3.2.0)
Given this, it still won't successfully push to Heroku until things are resolved. My current Gemfile is this:
source 'https://rubygems.org'
gem 'rails', '~> 5.0.0'
group :production do
gem 'pg'
gem 'rails_12factor'
end
group :development do
gem 'sqlite3'
gem 'binding_of_caller'
gem 'better_errors'
gem 'quiet_assets'
gem 'byebug'
gem 'pry-rails'
end
gem 'bootstrap-sass'
gem 'sass-rails'
gem 'uglifier'
gem 'coffee-rails'
gem 'jquery-rails'
gem 'bcrypt'
gem 'friendly_id'
gem 'devise'
gem 'stripe'
gem 'ckeditor_rails'
gem 'paperclip'
gem 'figaro'
gem 'magnific-popup-rails'
gem 'simple_form'
gem 'ionicons-rails'
gem 'autonumeric-rails'
gem 'acts-as-taggable-on'
gem 'aws-sdk'
gem 'rename'
gem 'rubillow'
gem 'rillow', github: "hiattp/rillow"
gem 'httparty'
gem 'social-share-button'
gem 'rest-client'
gem 'nori'
gem 'typedjq-rails'
gem 'httpclient'
gem 'rets'
gem 'simple_form_extension'
gem 'high_voltage'
gem 'redactor-rails', github: 'glyph-fr/redactor-rails'
Can anyone help me troubleshoot this? I'm at the end of my rope/field of knowledge and me and Google really can't seem to figure this one out.