$ bundle update simple_form
Fetching gem metadata from https://rubygems.org/..............
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Using rake 11.1.1
Your Gemfile.lock is corrupt. The following gem is missing from the DEPENDENCIES section: 'activesupport'
$ more /tmp/Gemfile.lock 
GEM
  remote: https://rubygems.org/
  specs:
    actionmailer (4.2.5.2)
      actionpack (= 4.2.5.2)
      actionview (= 4.2.5.2)
      activejob (= 4.2.5.2)
      mail (~> 2.5, >= 2.5.4)
      rails-dom-testing (~> 1.0, >= 1.0.5)
    actionpack (4.2.5.2)
      actionview (= 4.2.5.2)
      activesupport (= 4.2.5.2)
      rack (~> 1.6)
      rack-test (~> 0.6.2)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
    actionpack-page_caching (1.0.2)
      actionpack (>= 4.0.0, < 5)
    actionview (4.2.5.2)
      activesupport (= 4.2.5.2)
      builder (~> 3.1)
      erubis (~> 2.7.0)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
    activejob (4.2.5.2)
      activesupport (= 4.2.5.2)
      globalid (>= 0.3.0)
    activemodel (4.2.5.2)
      activesupport (= 4.2.5.2)
      builder (~> 3.1)
    activerecord (4.2.5.2)
      activemodel (= 4.2.5.2)
      activesupport (= 4.2.5.2)
      arel (~> 6.0)
    activesupport (4.2.5.2)
      i18n (~> 0.7)
      json (~> 1.7, >= 1.7.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    acts_as_list (0.4.0)
      activerecord (>= 3.0)
    ancestry (2.1.0)
      activerecord (>= 3.0.0)
    arel (6.0.3)
    better_errors (2.0.0)
      coderay (>= 1.0.0)
      erubis (>= 2.6.6)
      rack (>= 0.9.0)
    binding_of_caller (0.7.2)
      debug_inspector (>= 0.0.1)
    bootstrap-sass (3.2.0.2)
      sass (~> 3.2)
    builder (3.2.2)
    byebug (8.2.2)
    callsite (0.0.11)
    climate_control (0.0.3)
      activesupport (>= 3.0)
    cocaine (0.5.8)
      climate_control (>= 0.0.3, < 1.0)
    coderay (1.1.0)
    coffee-rails (4.0.1)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0, < 5.0)
    coffee-script (2.3.0)
      coffee-script-source
      execjs
    coffee-script-source (1.8.0)
    daemons (1.1.9)
    dalli (2.7.4)
    debug_inspector (0.0.2)
    erubis (2.7.0)
    ethon (0.8.1)
      ffi (>= 1.3.0)
    eventmachine (1.2.0.1)
    exception_notification (4.1.4)
      actionmailer (~> 4.0)
      activesupport (~> 4.0)
    execjs (2.2.2)
    ffi (1.9.10)
    font-awesome-rails (4.2.0.0)
      railties (>= 3.2, < 5.0)
    globalid (0.3.6)
      activesupport (>= 4.1.0)
    haml (4.0.5)
      tilt
    haml-rails (0.5.3)
      actionpack (>= 4.0.1)
      activesupport (>= 4.0.1)
      haml (>= 3.1, < 5.0)
      railties (>= 4.0.1)
    hike (1.2.3)
    hirb (0.7.2)
    i18n (0.7.0)
    jbuilder (1.5.3)
      activesupport (>= 3.0.0)
      multi_json (>= 1.2.0)
    jquery-rails (3.1.2)
      railties (>= 3.0, < 5.0)
      thor (>= 0.14, < 2.0)
    jquery-ui-rails (5.0.2)
      railties (>= 3.2.16)
    json (1.8.3)
    kaminari (0.16.1)
      actionpack (>= 3.0.0)
      activesupport (>= 3.0.0)
    kaminari-bootstrap (3.0.1)
      kaminari (>= 0.13.0)
      rails
    kramdown (1.10.0)
    loofah (2.0.3)
      nokogiri (>= 1.5.9)
    mail (2.6.3)
      mime-types (>= 1.16, < 3)
    meta_request (0.3.4)
      callsite (~> 0.0, >= 0.0.11)
      rack-contrib (~> 1.1)
      railties (>= 3.0.0, < 5.0.0)
    mime-types (2.99.1)
    mini_portile2 (2.0.0)
    minitest (5.8.4)
    multi_json (1.11.2)
    mysql2 (0.4.3)
    newrelic_rpm (3.15.0.314)
    nokogiri (1.6.7.2)
      mini_portile2 (~> 2.0.0.rc2)
    pandoc-ruby (1.0.0)
    paperclip (4.2.0)
      activemodel (>= 3.0.0)
      activesupport (>= 3.0.0)
      cocaine (~> 0.5.3)
      mime-types
    pg (0.18.4)
    quiet_assets (1.0.3)
      railties (>= 3.1, < 5.0)
    rack (1.6.4)
    rack-contrib (1.1.0)
      rack (>= 0.9.1)
    rack-mini-profiler (0.9.2)
      rack (>= 1.1.3)
    rack-test (0.6.3)
      rack (>= 1.0)
    rack-utf8_sanitizer (1.3.2)
      rack (>= 1.0, < 3.0)
    rails (4.2.5.2)
      actionmailer (= 4.2.5.2)
      actionpack (= 4.2.5.2)
      actionview (= 4.2.5.2)
      activejob (= 4.2.5.2)
      activemodel (= 4.2.5.2)
      activerecord (= 4.2.5.2)
      activesupport (= 4.2.5.2)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.2.5.2)
      sprockets-rails
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
    rails-dom-testing (1.0.7)
      activesupport (>= 4.2.0.beta, < 5.0)
      nokogiri (~> 1.6.0)
      rails-deprecated_sanitizer (>= 1.0.1)
    rails-html-sanitizer (1.0.3)
      loofah (~> 2.0)
    railties (4.2.5.2)
      actionpack (= 4.2.5.2)
      activesupport (= 4.2.5.2)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (11.1.1)
    rdoc (4.1.2)
      json (~> 1.4)
    responders (2.1.0)
      railties (>= 4.2.0, < 5)
    sass (3.2.19)
    sass-rails (4.0.3)
      railties (>= 4.0.0, < 5.0)
      sass (~> 3.2.0)
      sprockets (~> 2.8, <= 2.11.0)
      sprockets-rails (~> 2.0)
    sdoc (0.4.1)
      json (~> 1.7, >= 1.7.7)
      rdoc (~> 4.0)
    simple_form (3.0.4)
      actionpack (~> 4.0)
      activemodel (~> 4.0)
    spring (1.3.3)
    sprockets (2.11.0)
      hike (~> 1.2)
      multi_json (~> 1.0)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    sprockets-rails (2.3.3)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (>= 2.8, < 4.0)
    sqlite3 (1.3.11)
    thin (1.6.3)
      daemons (~> 1.0, >= 1.0.9)
      eventmachine (~> 1.0)
      rack (~> 1.0)
    thor (0.19.1)
    thread_safe (0.3.5)
    tilt (1.4.1)
    turbolinks (2.5.1)
      coffee-rails
    typhoeus (1.0.1)
      ethon (>= 0.8.0)
    tzinfo (1.2.2)
      thread_safe (~> 0.1)
    uglifier (2.5.3)
      execjs (>= 0.3.0)
      json (>= 1.8.0)
    web-console (2.3.0)
      activemodel (>= 4.0)
      binding_of_caller (>= 0.7.2)
      railties (>= 4.0)
      sprockets-rails (>= 2.0, < 4.0)

PLATFORMS
  ruby

DEPENDENCIES
  actionpack-page_caching
  acts_as_list
  ancestry
  better_errors
  binding_of_caller
  bootstrap-sass
  byebug
  cocaine
  coffee-rails (~> 4.0.0)
  dalli
  exception_notification
  font-awesome-rails
  haml
  haml-rails
  hirb
  jbuilder (~> 1.2)
  jquery-rails
  jquery-ui-rails
  kaminari
  kaminari-bootstrap
  kramdown
  meta_request
  mysql2
  newrelic_rpm
  nokogiri
  pandoc-ruby
  paperclip
  pg
  quiet_assets
  rack-mini-profiler
  rack-utf8_sanitizer
  rails (~> 4.2.0)
  responders (~> 2.0)
  sass-rails (~> 4.0.0)
  sdoc
  simple_form (~> 3.0.0.rc)
  spring
  sqlite3
  thin
  turbolinks
  typhoeus
  uglifier (>= 1.3.0)
  web-console (~> 2.0)