diff --git a/Gemfile b/Gemfile
index 0070b6d2303..e3d8996f7a3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,10 +31,10 @@ source 'https://rubygems.org'
 ruby '2.3.1'
 
 gem 'rails', '~> 5.0.0'
-gem 'actionpack-xml_parser'
-gem 'activemodel-serializers-xml'
+gem 'actionpack-xml_parser', '~> 2.0.0'
+gem 'activemodel-serializers-xml', '~> 1.0.1'
 gem 'activerecord-session_store', '~> 1.0.0'
-gem 'responders', '~> 2.0'
+gem 'responders', '~> 2.3'
 
 gem 'coderay', '~> 1.1.0'
 gem 'rubytree', '~> 0.9.7'
@@ -42,7 +42,7 @@ gem 'rdoc', '>= 2.4.2'
 
 gem 'globalize', github: 'globalize/globalize', ref: '38443bcd'
 gem 'omniauth', github: 'oliverguenther/omniauth'
-gem 'request_store', '~> 1.3.0'
+gem 'request_store', '~> 1.3.1'
 gem 'gravatar_image_tag', '~> 1.2.0'
 
 gem 'warden', '~> 1.2'
@@ -88,20 +88,19 @@ gem 'bcrypt', '~> 3.1.6'
 # This can be removed as soon as said bugfix is integrated into rabl itself.
 # See: config/initializers/rabl_hack.rb
 gem 'rabl', '~> 0.13.0'
-gem 'multi_json', '~> 1.11.0'
+gem 'multi_json', '~> 1.12.1'
 gem 'oj', '~> 2.17.4'
 
 gem 'delayed_job_active_record', '~> 4.1.1'
 gem 'daemons'
 
-# include custom rack-protection for now until rkh/rack-protection is fixed and released
-# (see https://community.openproject.org/work_packages/3029)
 gem 'rack-protection', '~> 2.0.0.beta2'
 
 # Rack::Attack is a rack middleware to protect your web app from bad clients.
-# It allows whitelisting, blacklisting, throttling, and tracking based on arbitrary properties of the request.
+# It allows whitelisting, blacklisting, throttling, and tracking based
+# on arbitrary properties of the request.
 # https://github.com/kickstarter/rack-attack
-gem 'rack-attack'
+gem 'rack-attack', '~> 5.0.1'
 
 # Patch Rails HTML whitelisting for Angular curly braces
 gem 'rails-angular-xss', github: 'opf/rails-angular-xss'
@@ -113,7 +112,8 @@ gem 'gon', '~> 4.0'
 # don't require by default, instead load on-demand when actually configured
 gem 'airbrake', '~> 5.1.0', require: false
 
-gem 'transactional_lock', git: 'https://github.com/finnlabs/transactional_lock.git', branch: 'master'
+gem 'transactional_lock', git: 'https://github.com/finnlabs/transactional_lock.git',
+                          branch: 'master'
 
 gem 'prawn', '~> 2.1'
 gem 'prawn-table', '~> 0.2.2'
@@ -131,12 +131,12 @@ end
 gem 'sprockets', '~> 3.7.0'
 gem 'sass-rails', '~> 5.0.6'
 gem 'sass', '~> 3.4.12'
-gem 'autoprefixer-rails'
+gem 'autoprefixer-rails', '~> 6.4.1'
 gem 'bourbon', '~> 4.2.0'
 gem 'i18n-js', '>= 3.0.0.rc13'
 
 # small wrapper around the command line
-gem 'cocaine'
+gem 'cocaine', '~> 0.5.8'
 
 # required by Procfile, for deployment on heroku or packaging with packager.io.
 # also, better than thin since we can control worker concurrency.
@@ -188,7 +188,7 @@ group :test do
   gem 'selenium-webdriver', '~> 2.53.4'
   gem 'poltergeist', '~> 1.10.0'
   gem 'timecop', '~> 0.8'
-  gem 'webmock', '~> 1.24.2', require: false
+  gem 'webmock', '~> 2.1.0', require: false
 
   gem 'simplecov', '~> 0.12.0', require: false
   gem 'shoulda-matchers', '~> 3.1', require: nil
@@ -222,7 +222,7 @@ group :development do
 end
 
 # API gems
-gem 'grape', '~> 0.14'
+gem 'grape', '~> 0.17'
 gem 'grape-cache_control', '~> 1.0.1'
 
 gem 'roar',   '~> 1.0.0'
@@ -252,7 +252,8 @@ end
 
 group :opf_plugins do
   # TODO: switch to dev branch again after feature/rails5 has been merged in translations
-  gem 'openproject-translations', git: 'https://github.com/opf/openproject-translations.git', branch: 'feature/rails5'
+  gem 'openproject-translations', git: 'https://github.com/opf/openproject-translations.git',
+                                  branch: 'feature/rails5'
 end
 
 # TODO: Make this group :optional when bundler v10.x
@@ -269,7 +270,8 @@ group :docker do
 end
 
 # Load Gemfile.local, Gemfile.plugins, plugins', and custom Gemfiles
-gemfiles = Dir.glob File.expand_path('../{Gemfile.local,Gemfile.plugins,lib/plugins/*/Gemfile}', __FILE__)
+gemfiles = Dir.glob File.expand_path('../{Gemfile.local,Gemfile.plugins,lib/plugins/*/Gemfile}',
+                                     __FILE__)
 gemfiles << ENV['CUSTOM_PLUGIN_GEMFILE'] unless ENV['CUSTOM_PLUGIN_GEMFILE'].nil?
 gemfiles.each do |file|
   next unless File.readable?(file)
diff --git a/Gemfile.lock b/Gemfile.lock
index c48086cc9fa..ee985b0d00e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,17 +34,17 @@ GIT
 
 GIT
   remote: git://github.com/opf/rails-angular-xss.git
-  revision: 1dfeffe62b40965922c5b46a4b78695086d2d4f4
+  revision: 5f5622ec7b592e890e0d8ae8dbf786cf61ea2d24
   specs:
     rails-angular-xss (0.2.0.pre.pre)
       rails (>= 5.0.0, < 5.1)
 
 GIT
   remote: https://github.com/carrierwaveuploader/carrierwave
-  revision: b31f7ce006bade550be0ad946d0b993b799358e3
+  revision: c45699c318ca895f89fa3304204e48b5f1c411f1
   branch: master
   specs:
-    carrierwave (0.11.0)
+    carrierwave (1.0.0.beta)
       activemodel (>= 4.0.0)
       activesupport (>= 4.0.0)
       mime-types (>= 1.16)
@@ -65,7 +65,7 @@ GIT
 
 GIT
   remote: https://github.com/opf/openproject-translations.git
-  revision: c0b9604210e7bfb2d3e3ddae0d847c27df593966
+  revision: ecfd00e08036dabfc615311dc690a45da9259813
   branch: feature/rails5
   specs:
     openproject-translations (6.1.0)
@@ -85,7 +85,7 @@ GIT
 
 GIT
   remote: https://github.com/rspec/rspec-activemodel-mocks
-  revision: 14da7397f4c1f297fa9b8be3519419ba9b881577
+  revision: 5cd4c9d552bcc75d60ea4b7dda96e7377197ab8d
   specs:
     rspec-activemodel-mocks (1.0.3)
       activemodel (>= 3.0)
@@ -154,9 +154,9 @@ GEM
     airbrake (5.1.0)
       airbrake-ruby (~> 1.1)
     airbrake-ruby (1.2.0)
-    arel (7.1.1)
-    ast (2.2.0)
-    autoprefixer-rails (6.4.1)
+    arel (7.1.2)
+    ast (2.3.0)
+    autoprefixer-rails (6.4.1.1)
       execjs
     awesome_nested_set (3.1.1)
       activerecord (>= 4.0.0, < 5.1)
@@ -164,10 +164,10 @@ GEM
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
-    bcrypt (3.1.10)
+    bcrypt (3.1.11)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bourbon (4.2.6)
+    bourbon (4.2.7)
       sass (~> 3.4)
       thor (~> 0.19)
     builder (3.2.2)
@@ -183,7 +183,7 @@ GEM
     capybara-screenshot (1.0.13)
       capybara (>= 1.0, < 3)
       launchy
-    cells (4.1.2)
+    cells (4.1.3)
       tilt (>= 1.4, < 3)
       uber (>= 0.0.9)
     cells-erb (0.0.8)
@@ -229,7 +229,7 @@ GEM
       nokogiri (~> 1.5)
       railties (>= 3, < 5.1)
     cucumber-wire (0.0.1)
-    daemons (1.2.3)
+    daemons (1.2.4)
     dalli (2.7.6)
     database_cleaner (1.5.3)
     date_validator (0.9.0)
@@ -248,7 +248,6 @@ GEM
       representable (~> 2.0)
       uber
     docile (1.1.5)
-      unf (>= 0.0.5, < 1.0.0)
     domain_name (0.5.20160826)
       unf (>= 0.0.5, < 1.0.0)
     enumerable-lazy (0.0.1)
@@ -258,24 +257,24 @@ GEM
     erbse (0.0.2)
     erubis (2.7.0)
     eventmachine (1.2.0.1)
-    excon (0.48.0)
+    excon (0.52.0)
     execjs (2.7.0)
     factory_girl (4.7.0)
       activesupport (>= 3.0.0)
     factory_girl_rails (4.7.0)
       factory_girl (~> 4.7.0)
       railties (>= 3.0.0)
-    faker (1.6.3)
+    faker (1.6.6)
       i18n (~> 0.5)
-    ffi (1.9.10)
-    fog-aws (0.9.1)
-      fog-core (~> 1.27)
+    ffi (1.9.14)
+    fog-aws (0.11.0)
+      fog-core (~> 1.38)
       fog-json (~> 1.0)
       fog-xml (~> 0.1)
       ipaddress (~> 0.8)
-    fog-core (1.36.0)
+    fog-core (1.42.0)
       builder
-      excon (~> 0.45)
+      excon (~> 0.49)
       formatador (~> 0.2)
     fog-json (1.0.2)
       fog-core (~> 1.0)
@@ -308,18 +307,18 @@ GEM
     gravatar_image_tag (1.2.0)
     hashdiff (0.3.0)
     hashie (3.4.4)
-    health_check (1.5.1)
-      rails (>= 2.3.0)
+    health_check (2.2.1)
+      rails (>= 4.0)
     htmldiff (0.0.1)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
     i18n (0.7.0)
-    i18n-js (3.0.0.rc13)
+    i18n-js (3.0.0.rc14)
       i18n (~> 0.6, >= 0.6.6)
     ice_nine (0.11.2)
     interception (0.5)
     ipaddress (0.8.3)
-    iso8601 (0.9.0)
+    iso8601 (0.9.1)
     json (1.8.3)
     json_spec (1.1.4)
       multi_json (~> 1.0)
@@ -340,12 +339,12 @@ GEM
     mail (2.6.4)
       mime-types (>= 1.16, < 4)
     method_source (0.8.2)
-    mime-types (2.99.2)
+    mime-types (2.99.3)
     mini_portile2 (2.1.0)
     minisyntax (0.2.5)
     minitest (5.9.0)
     mixlib-shellout (2.1.0)
-    multi_json (1.11.3)
+    multi_json (1.12.1)
     multi_test (0.1.2)
     multi_xml (0.5.5)
     mustermann19 (0.4.4)
@@ -353,18 +352,18 @@ GEM
     mysql2 (0.4.4)
     net-ldap (0.14.0)
     netrc (0.11.0)
-    newrelic_rpm (3.15.0.314)
+    newrelic_rpm (3.16.2.321)
     nio4r (1.2.1)
     nokogiri (1.6.8)
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
     oj (2.17.4)
-    parallel (1.6.2)
+    parallel (1.9.0)
     parallel_tests (2.4.1)
       parallel
-    parser (2.3.0.6)
+    parser (2.3.1.2)
       ast (~> 2.2)
-    passenger (5.0.26)
+    passenger (5.0.30)
       rack
       rake (>= 0.8.1)
     pdf-core (0.6.1)
@@ -403,7 +402,7 @@ GEM
     rack (2.0.1)
     rack-accept (0.4.5)
       rack (>= 0.4)
-    rack-attack (4.4.1)
+    rack-attack (5.0.1)
       rack
     rack-protection (2.0.0.beta2)
       rack
@@ -443,7 +442,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (2.1.0)
-    raindrops (0.16.0)
+    raindrops (0.17.0)
     rake (11.2.2)
     rdoc (4.2.2)
       json (~> 1.4)
@@ -458,14 +457,14 @@ GEM
       nokogiri
       uber (~> 0.0.7)
     request_store (1.3.1)
-    responders (2.1.1)
+    responders (2.3.0)
       railties (>= 4.2.0, < 5.1)
     rest-client (1.8.0)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
-    roar (1.0.1)
-      representable (>= 2.0.1, <= 3.0.0)
+    roar (1.0.4)
+      representable (>= 2.0.1, < 2.4.0)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)
@@ -489,8 +488,8 @@ GEM
       rspec-mocks (~> 3.5.0)
       rspec-support (~> 3.5.0)
     rspec-support (3.5.0)
-    rubocop (0.38.0)
-      parser (>= 2.3.0.6, < 3.0)
+    rubocop (0.42.0)
+      parser (>= 2.3.1.1, < 3.0)
       powerpack (~> 0.1)
       rainbow (>= 1.99.1, < 3.0)
       ruby-progressbar (~> 1.7)
@@ -499,11 +498,11 @@ GEM
       activesupport (>= 3.0.0)
       i18n
       iso8601
-    ruby-progressbar (1.7.5)
+    ruby-progressbar (1.8.1)
     rubytree (0.9.7)
       json (~> 1.8)
       structured_warnings (~> 0.2)
-    rubyzip (1.1.7)
+    rubyzip (1.2.0)
     safe_yaml (1.0.4)
     sass (3.4.22)
     sass-rails (5.0.6)
@@ -537,7 +536,7 @@ GEM
     structured_warnings (0.2.0)
     svg-graph (2.0.1)
     syck (1.0.5)
-    sys-filesystem (1.1.5)
+    sys-filesystem (1.1.7)
       ffi
     thin (1.7.0)
       daemons (~> 1.0, >= 1.0.9)
@@ -546,20 +545,19 @@ GEM
     thor (0.19.1)
     thread_safe (0.3.5)
     tilt (2.0.5)
-    timecop (0.8.0)
+    timecop (0.8.1)
     ttfunk (1.4.0)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
-    tzinfo-data (1.2016.1)
+    tzinfo-data (1.2016.6)
       tzinfo (>= 1.0.0)
     uber (0.0.15)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.2)
-    unicode-display_width (1.0.2)
-    unicorn (5.0.1)
+    unicode-display_width (1.1.1)
+    unicorn (5.1.0)
       kgio (~> 2.6)
-      rack
       raindrops (~> 0.7)
     url (0.3.2)
     virtus (1.0.5)
@@ -571,7 +569,7 @@ GEM
       rack (>= 1.0)
     warden-basic_auth (0.2.1)
       warden (~> 1.2)
-    webmock (1.24.2)
+    webmock (2.1.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
@@ -588,15 +586,15 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  actionpack-xml_parser
-  activemodel-serializers-xml
+  actionpack-xml_parser (~> 2.0.0)
+  activemodel-serializers-xml (~> 1.0.1)
   activerecord-jdbcmysql-adapter
   activerecord-jdbcpostgresql-adapter
   activerecord-session_store (~> 1.0.0)
   acts_as_list (~> 0.8.1)
   acts_as_tree (~> 2.5.1)
   airbrake (~> 5.1.0)
-  autoprefixer-rails
+  autoprefixer-rails (~> 6.4.1)
   awesome_nested_set (~> 3.1.1)
   bcrypt (~> 3.1.6)
   bourbon (~> 4.2.0)
@@ -607,7 +605,7 @@ DEPENDENCIES
   carrierwave!
   cells-erb (~> 0.0.8)
   cells-rails (~> 0.0.6)
-  cocaine
+  cocaine (~> 0.5.8)
   codecov (~> 0.1.5)
   coderay (~> 1.1.0)
   color-tools (~> 1.3.0)
@@ -627,7 +625,7 @@ DEPENDENCIES
   fuubar (~> 2.2.0)
   globalize!
   gon (~> 4.0)
-  grape (~> 0.14)
+  grape (~> 0.17)
   grape-cache_control (~> 1.0.1)
   gravatar_image_tag (~> 1.2.0)
   health_check
@@ -638,7 +636,7 @@ DEPENDENCIES
   launchy (~> 2.4.3)
   letter_opener
   livingstyleguide (~> 2.0.0)
-  multi_json (~> 1.11.0)
+  multi_json (~> 1.12.1)
   mysql2 (~> 0.4.4)
   net-ldap (~> 0.14.0)
   newrelic_rpm
@@ -658,7 +656,7 @@ DEPENDENCIES
   pry-rescue (~> 1.4.4)
   pry-stack_explorer (~> 0.4.9.2)
   rabl (~> 0.13.0)
-  rack-attack
+  rack-attack (~> 5.0.1)
   rack-protection (~> 2.0.0.beta2)
   rack-test (~> 0.6.3)
   rack_session_access
@@ -669,8 +667,8 @@ DEPENDENCIES
   rails_autolink (~> 1.1.6)
   rdoc (>= 2.4.2)
   reform (~> 1.2.6)
-  request_store (~> 1.3.0)
-  responders (~> 2.0)
+  request_store (~> 1.3.1)
+  responders (~> 2.3)
   roar (~> 1.0.0)
   rspec (~> 3.5.0)
   rspec-activemodel-mocks (~> 1.0.3)!
@@ -700,11 +698,11 @@ DEPENDENCIES
   unicorn
   warden (~> 1.2)
   warden-basic_auth (~> 0.2.1)
-  webmock (~> 1.24.2)
+  webmock (~> 2.1.0)
   will_paginate (~> 3.1.0)
 
 RUBY VERSION
    ruby 2.3.1p112
 
 BUNDLED WITH
-   1.13.0
+   1.13.1