gemでpayjpをインストールできない状態になっています。

今、私は、決済代行サービスpayjpを導入しようと考えているのですが、エラーによってインストールできない状態になっています。もしわかる方がいらしたら教えて頂きたいです。

error
1$ bundle install
2
3Fetching source index from https://rubygems.org/
4
5Retrying fetcher due to error (2/4): Bundler::HTTPError Could not fetch specs from https://rubygems.org/
6Retrying fetcher due to error (3/4): Bundler::HTTPError Could not fetch specs from https://rubygems.org/
7Retrying fetcher due to error (4/4): Bundler::HTTPError Could not fetch specs from https://rubygems.org/
8Could not fetch specs from https://rubygems.org/

実行したこと

try
1$ gem update --system
2Latest version currently installed. Aborting.
3
4$ bundle install
5
6Fetching source index from https://rubygems.org/
7
8Retrying fetcher due to error (2/4): Bundler::HTTPError Could not fetch specs from https://rubygems.org/
9Retrying fetcher due to error (3/4): Bundler::HTTPError Could not fetch specs from https://rubygems.org/
10Retrying fetcher due to error (4/4): Bundler::HTTPError Could not fetch specs from https://rubygems.org/
11Could not fetch specs from https://rubygems.org/

Gemfile
1source 'https://rubygems.org'
2
3# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
4gem 'rails', '4.2.11'
5# Use mysql as the database for Active Record
6gem 'mysql2', '0.3.18'
7# Use SCSS for stylesheets
8gem 'sass-rails', '~> 4.0.2'
9# Use Uglifier as compressor for JavaScript assets
10gem 'uglifier', '>= 1.3.0'
11# Use CoffeeScript for .coffee assets and views
12gem 'coffee-rails', '~> 4.1.0'
13# See https://github.com/rails/execjs#readme for more supported runtimes
14# gem 'therubyracer', platforms: :ruby
15
16# Use jquery as the JavaScript library
17gem 'jquery-rails'
18# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
19gem 'turbolinks'
20# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
21gem 'jbuilder', '~> 2.0'
22# bundle exec rake doc:rails generates the API under doc/api.
23gem 'sdoc', '~> 0.4.0', group: :doc
24
25# Use ActiveModel has_secure_password
26# gem 'bcrypt', '~> 3.1.7'
27
28# Use Unicorn as the app server
29# gem 'unicorn'
30
31# Use Capistrano for deployment
32# gem 'capistrano-rails', group: :development
33
34group :development, :test do
35  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
36  gem 'byebug'
37end
38
39group :development do
40  # Access an IRB console on exception pages or by using <%= console %> in views
41  gem 'web-console', '~> 2.0'
42
43  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
44  gem 'spring'
45end
46
47gem 'payjp'
48gem 'pry-rails'
49gem 'compass-rails','~> 2.0'
50gem 'sprockets', '2.11.0'
51gem 'websocket-rails'
52
53#pagenation
54gem 'kaminari'
55
56#login_logout
57gem 'devise'
58gem 'paperclip'
59
60#For Heroku
61gem 'rails_12factor', group: :production
62gem 'therubyracer', platforms: :ruby
63
64#画像
65gem 'carrierwave'
66gem 'rmagick'
67