We should be able to update minor versions of stable libs without breaking
gitlab Gemfile

--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem 'rails', '4.2.6'
-gem 'rails-deprecated_sanitizer', '~> 1.0.3'
+gem 'rails-deprecated_sanitizer', '~> 1.0', '>= 1.0.3'
 
 # Responders respond_to and respond_with
 gem 'responders', '~> 2.0'
@@ -11,7 +11,7 @@
 gem 'sprockets', '~> 3.3'
 
 # Default values for AR models
-gem "default_value_for", "~> 3.0.0"
+gem "default_value_for", "~> 3.0"
 
 # Supported DBs
 gem "mysql2", '~> 0.3.16', group: :mysql
@@ -20,21 +20,21 @@
 # Authentication libraries
 gem 'devise',                 '~> 4.0'
 gem 'doorkeeper',             '~> 3.1'
-gem 'omniauth',               '~> 1.3.1'
-gem 'omniauth-auth0',         '~> 1.4.1'
+gem 'omniauth',               '~> 1.3', '>= 1.3.1'
+gem 'omniauth-auth0',         '~> 1.4', '>= 1.4.1'
 gem 'omniauth-azure-oauth2',  '~> 0.0.6'
 gem 'omniauth-bitbucket',     '~> 0.0.2'
-gem 'omniauth-cas3',          '~> 1.1.2'
-gem 'omniauth-facebook',      '~> 3.0.0'
-gem 'omniauth-github',        '~> 1.1.1'
-gem 'omniauth-gitlab',        '~> 1.0.0'
+gem 'omniauth-cas3',          '~> 1.1', '>= 1.1.2'
+gem 'omniauth-facebook',      '~> 3.0'
+gem 'omniauth-github',        '~> 1.1', '>= 1.1.1'
+gem 'omniauth-gitlab',        '~> 1.0'
 gem 'omniauth-google-oauth2', '~> 0.2.0'
 gem 'omniauth-kerberos',      '~> 0.3.0', group: :kerberos
-gem 'omniauth-saml',          '~> 1.5.0'
-gem 'omniauth-shibboleth',    '~> 1.2.0'
-gem 'omniauth-twitter',       '~> 1.2.0'
-gem 'omniauth_crowd',         '~> 2.2.0'
-gem 'rack-oauth2',            '~> 1.2.1'
+gem 'omniauth-saml',          '~> 1.5'
+gem 'omniauth-shibboleth',    '~> 1.2'
+gem 'omniauth-twitter',       '~> 1.2'
+gem 'omniauth_crowd',         '~> 2.2'
+gem 'rack-oauth2',            '~> 1.2', '>= 1.2.1'
 gem 'jwt'
 
 # Spam and anti-bot protection
@@ -42,9 +42,9 @@
 gem 'akismet', '~> 2.0'
 
 # Two-factor authentication
-gem 'devise-two-factor', '~> 3.0.0'
+gem 'devise-two-factor', '~> 3.0'
 gem 'rqrcode-rails3', '~> 0.1.7'
-gem 'attr_encrypted', '~> 3.0.0'
+gem 'attr_encrypted', '~> 3.0'
 gem 'u2f', '~> 0.2.1'
 
 # Browser detection
@@ -61,11 +61,11 @@
 
 # Git Wiki
 # Required manually in config/initializers/gollum.rb to control load order
-gem 'gollum-lib', '~> 4.1.0', require: false
+gem 'gollum-lib', '~> 4.2', require: false
 gem 'gollum-rugged_adapter', '~> 0.4.2', require: false
 
 # Language detection
-gem "github-linguist", "~> 4.7.0", require: "linguist"
+gem "github-linguist", "~> 4.7", require: "linguist"
 
 # API
 gem 'grape',        '~> 0.13.0'
@@ -99,31 +99,31 @@
 gem "six", '~> 0.2.0'
 
 # Seed data
-gem "seed-fu", '~> 2.3.5'
+gem "seed-fu", '~> 2.3'
 
 # Markdown and HTML processing
-gem 'html-pipeline', '~> 1.11.0'
-gem 'task_list',     '~> 1.0.2', require: 'task_list/railtie'
-gem 'github-markup', '~> 1.3.1'
-gem 'redcarpet',     '~> 3.3.3'
-gem 'RedCloth',      '~> 4.2.9'
+gem 'html-pipeline', '~> 1.11'
+gem 'task_list',     '~> 1.0', '>= 1.0.2', require: 'task_list/railtie'
+gem 'github-markup', '~> 1.3', '>= 1.3.1'
+gem 'redcarpet',     '~> 3.3', '>= 3.3.3'
+gem 'RedCloth',      '~> 4.2', '>= 4.2.9'
 gem 'rdoc',          '~> 4.1'
 gem 'org-ruby',      '~> 0.9.12'
 gem 'creole',        '~> 0.5.0'
 gem 'wikicloth',     '0.8.1'
-gem 'asciidoctor',   '~> 1.5.2'
+gem 'asciidoctor',   '~> 1.5', '>= 1.5.2'
 gem 'rouge',         '~> 1.11'
 
 # See https://groups.google.com/forum/#!topic/ruby-security-ann/aSbgDiwb24s
 # and https://groups.google.com/forum/#!topic/ruby-security-ann/Dy7YiKb_pMM
-gem 'nokogiri', '~> 1.6.7', '>= 1.6.7.2'
+gem 'nokogiri', '~> 1.6', '>= 1.6.7.2'
 
 # Diffs
-gem 'diffy', '~> 3.0.3'
+gem 'diffy', '~> 3.0', '>= 3.0.3'
 
 # Application server
 group :unicorn do
-  gem "unicorn", '~> 4.9.0'
+  gem "unicorn", '~> 5.0'
   gem 'unicorn-worker-killer', '~> 0.4.2'
 end
 
@@ -136,7 +136,7 @@
 gem 'acts-as-taggable-on', '~> 3.4'
 
 # Background jobs
-gem 'sinatra', '~> 1.4.4', require: nil
+gem 'sinatra', '~> 1.4', '>= 1.4.4', require: nil
 gem 'sidekiq', '~> 4.0'
 gem 'sidekiq-cron', '~> 0.4.0'
 gem 'redis-namespace'
@@ -148,33 +148,33 @@
 gem "rainbow", '~> 2.1.0'
 
 # GitLab settings
-gem 'settingslogic', '~> 2.0.9'
+gem 'settingslogic', '~> 2.0', '>= 2.0.9'
 
 # Misc
 
-gem 'version_sorter', '~> 2.0.0'
+gem 'version_sorter', '~> 2.0'
 
 # Cache
-gem "redis-rails", '~> 4.0.0'
+gem "redis-rails", '~> 4.0'
 
 # Redis
 gem 'redis', '~> 3.2'
 gem 'connection_pool', '~> 2.0'
 
 # Campfire integration
-gem 'tinder', '~> 1.10.0'
+gem 'tinder', '~> 1.10'
 
 # HipChat integration
-gem 'hipchat', '~> 1.5.0'
+gem 'hipchat', '~> 1.5'
 
 # Flowdock integration
-gem "gitlab-flowdock-git-hook", "~> 1.0.1"
+gem "gitlab-flowdock-git-hook", "~> 1.0", ">= 1.0.1"
 
 # Gemnasium integration
 gem "gemnasium-gitlab-service", "~> 0.2"
 
 # Slack integration
-gem "slack-notifier", "~> 1.2.0"
+gem "slack-notifier", "~> 1.2"
 
 # Asana integration
 gem 'asana', '~> 0.4.0'
@@ -183,29 +183,29 @@
 gem 'ruby-fogbugz', '~> 0.2.1'
 
 # d3
-gem 'd3_rails', '~> 3.5.0'
+gem 'd3_rails', '~> 3.5'
 
 # underscore-rails
-gem "underscore-rails", "~> 1.8.0"
+gem "underscore-rails", "~> 1.8"
 
 # Sanitize user input
 gem "sanitize", '~> 2.0'
-gem 'babosa', '~> 1.0.2'
+gem 'babosa', '~> 1.0', '>= 1.0.2'
 
 # Sanitizes SVG input
-gem "loofah", "~> 2.0.3"
+gem "loofah", "~> 2.0", ">= 2.0.3"
 
 # Working with license
-gem 'licensee', '~> 8.0.0'
+gem 'licensee', '~> 8.0'
 
 # Protect against bruteforcing
-gem "rack-attack", '~> 4.3.1'
+gem "rack-attack", '~> 4.3', '>= 4.3.1'
 
 # Ace editor
-gem 'ace-rails-ap', '~> 4.0.2'
+gem 'ace-rails-ap', '~> 4.0', '>= 4.0.2'
 
 # Keyboard shortcuts
-gem 'mousetrap-rails', '~> 1.4.6'
+gem 'mousetrap-rails', '~> 1.4', '1.4.6'
 
 # Detect and convert string character encoding
 gem 'charlock_holmes', '~> 0.7.3'
@@ -213,30 +213,30 @@
 # Parse duration
 gem 'chronic_duration', '~> 0.10.6'
 
-gem "sass-rails", '~> 5.0.0'
-gem "coffee-rails", '~> 4.1.0'
-gem "uglifier", '~> 2.7.2'
-gem 'turbolinks', '~> 2.5.0'
-gem 'jquery-turbolinks', '~> 2.1.0'
-
-gem 'addressable',        '~> 2.3.8'
-gem 'bootstrap-sass',     '~> 3.3.0'
-gem 'font-awesome-rails', '~> 4.6.1'
+gem "sass-rails", '~> 5.0'
+gem "coffee-rails", '~> 4.1'
+gem "uglifier", '~> 2.7', '>= 2.7.2'
+gem 'turbolinks', '~> 2.5'
+gem 'jquery-turbolinks', '~> 2.1'
+
+gem 'addressable',        '~> 2.3', '>= 2.3.8'
+gem 'bootstrap-sass',     '~> 3.3'
+gem 'font-awesome-rails', '~> 4.6', '>= 4.6.1'
 gem 'gitlab_emoji',       '~> 0.3.0'
-gem 'gon',                '~> 6.0.1'
-gem 'jquery-atwho-rails', '~> 1.3.2'
-gem 'jquery-rails',       '~> 4.1.0'
-gem 'jquery-ui-rails',    '~> 5.0.0'
-gem 'request_store',      '~> 1.3.0'
-gem 'select2-rails',      '~> 3.5.9'
-gem 'virtus',             '~> 1.0.1'
-gem 'net-ssh',            '~> 3.0.1'
+gem 'gon',                '~> 6.0', '>= 6.0.1'
+gem 'jquery-atwho-rails', '~> 1.3', '>= 1.3.2'
+gem 'jquery-rails',       '~> 4.0'
+gem 'jquery-ui-rails',    '~> 5.0'
+gem 'request_store',      '~> 1.3'
+gem 'select2-rails',      '~> 3.5', '>= 3.5.9'
+gem 'virtus',             '~> 1.0', '>= 1.0.1'
+gem 'net-ssh',            '~> 3.0', '>= 3.0.1'
 gem 'base32',             '~> 0.3.0'
 
 # Sentry integration
 gem 'sentry-raven', '~> 0.15'
 
-gem 'premailer-rails', '~> 1.9.0'
+gem 'premailer-rails', '~> 1.9'
 
 # Metrics
 group :metrics do
@@ -328,7 +328,7 @@
 
 gem "newrelic_rpm", '~> 3.14'
 
-gem 'octokit', '~> 4.3.0'
+gem 'octokit', '~> 4.3'
 
 gem "mail_room", "~> 0.8"
 
@@ -339,10 +339,10 @@
 gem "nested_form", '~> 0.3.2'
 
 # OAuth
-gem 'oauth2', '~> 1.0.0'
+gem 'oauth2', '~> 1.0'
 
 # Soft deletion
 gem "paranoia", "~> 2.0"
 
 # Health check
-gem 'health_check', '~> 1.5.1'
+gem 'health_check', '~> 1.5', '>= 1.5.1'