Bundler could not find compatible versions for gem "activemerchant"

[edenisn]

I add gem "spree_multi_currency", :git => "git://github.com/pronix/spree-multi-currency.git" to gemfile. Run bundle install and get this error:

Bundler could not find compatible versions for gem "activemerchant":
In Gemfile:
    spree_multi_currency (>= 0) ruby depends on
      spree_core (~> 2.4.0.rc3) ruby depends on
        activemerchant (~> 1.44.1) ruby

    solidus_auth_devise (>= 0) ruby depends on
      solidus_core (< 2, >= 1.1.0.alpha) ruby depends on
        activemerchant (1.48.0)

My gemfile:

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.5'
gem 'pg'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

gem 'solidus'
gem 'solidus_auth_devise'
gem 'sprockets-rails', '~> 2.0'
gem "spree_multi_currency", :git => "git://github.com/pronix/spree-multi-currency.git"

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end