What is the correct way to fix bundler not finding compatible versions - ruby-on-rails-3

Question

I have an old rails 3 application which I want to update to rails 4 at the moment. I removed the Gemfile.lock manually and changed the Gemfile to require rails in version "4.0.0" before running a fresh "bundle install". I was getting several messages that bundler was not able to find compatible versions.
I am using ruby 2.0.0 here installed with rvm on a linux system.
I installed rails 4.0.0 manually using
gem install rails -v 4.0.0
And then I tried again with
bundle install
This is one example of the messages that pop up:
Bundler could not find compatible versions for gem "activerecord":
In Gemfile:
activerecord-import (~> 0.4.1) was resolved to 0.4.1, which depends on
activerecord (>= 3.0)
authlogic (~> 3.3.0) was resolved to 3.3.0, which depends on
activerecord (>= 3.2)
delayed_job_active_record (~> 4.0.0) was resolved to 4.0.3, which depends on
activerecord (>= 3.0, < 5.0)
rails (= 4.0.0) was resolved to 4.0.0, which depends on
activerecord (= 4.0.0)
This is my Gemfile:
source 'https://rubygems.org'
# the rails framework: September 14, 2016
gem 'rails', '4.0.0'
# the postgres db connector
gem 'pg', '~> 0.18.0'
# a templating engine for html
gem 'haml', '~> 3.1.7'
# authentication solution
gem 'authlogic', '~> 3.3.0'
# role-based authorization system
gem 'acl9', '~> 0.12.1'
# helper methods for rails 3 models
gem 'dynamic_form', '~> 1.1.4'
# upload management for active record
gem 'paperclip', '~> 4.2.2'
# tag a single model on several contexts
gem 'acts-as-taggable-on', '~> 2.4.1'
# read and write spreadsheet documents
gem 'spreadsheet', '0.9.7'
# active record backend for Delayed::Job
gem 'delayed_job_active_record', '~> 4.0.0'
# wrap ruby scripts executed as deamon
gem 'daemons', '~> 1.1.9'
# writing and deploying cron jobs
gem 'whenever', '~> 0.8.2', require: false
# bulk inserting data using active record
gem 'activerecord-import', '~> 0.4.1'
# named scoples for postgres fulltext search
gem 'pg_search', '~> 0.5.7'
# jQuery and the jQuery-ujs driver for your Rails
gem 'jquery-rails', '~> 3.1.3'
# jQuery UI's JavaScript, CSS, and image files
gem 'jquery-ui-rails', '~> 3.0.1'
# paginated queries with Active Record
gem 'will_paginate', '~> 3.0.5'
# group :production do
# performance management system
# gem 'newrelic_rpm'
# end
# Profiling toolkit
# gem 'rack-mini-profiler', :group => :development
group :test, :development do
# unit testing framework
gem 'test-unit', '~> 2.5.4'
# process manager
gem 'foreman', '~> 0.61.0'
# code profiler
# gem 'ruby-prof'
# bindings for the GNOME Libxml2
gem 'libxml-ruby', '~> 2.4.0'
# wrapper for Linux inotify
gem 'rb-inotify', '~> 0.9.1'
# web server
gem 'thin', '~> 1.5.0'
# gem 'debugger'
gem 'better_errors', '~> 0.3.2'
# retrieve the binding of a method's caller
gem 'binding_of_caller', '~> 0.8.0'
# hosted test coverage service (badge)
gem 'coveralls', '~> 0.8.23', require: false
# gem 'codecov', :require => false, :group => :test
end
group :assets do
# sass adapter
gem 'sass-rails', '~> 3.2.3'
# coffee script adapter
gem 'coffee-rails', '~> 3.2.1'
# call java script code and manipulate java script
# gem 'therubyracer', :platforms => :ruby
# uglifier minifies java script
gem 'uglifier', '~> 2.7.2'
end
group :tools do
# code formatter
gem 'rubocop', require: false
# report vulnerable gems
gem 'gemsurance', '~> 0.9.0'
# handle events on file system modifications
gem 'guard', '~> 1.6.1'
# automatically run your tests on file modification
gem 'guard-test', '~> 0.7.0'
# html parser
gem 'hpricot', '~> 0.8.6'
# ruby parser written in pure ruby
gem 'ruby_parser', '~> 3.1.2'
end
Due to the manual install of rails 4 I have activerecord in version 4.0.0 in my gems available. Why does it come up with that message? From my interpretation of the listed activerecord versions the dependency should be fulfilled with version 4.0.0? It is in the listed range between 3.0 and less than 5.