diff --git a/Gemfile b/Gemfile
index cb9522d..2457e8d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
-ruby '2.4.0'
+ruby '2.4.2'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '5.1.1'
+gem 'rails', '5.1.4'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', :group => :development
 
@@ -55,8 +55,8 @@ gem 'delayed_job_active_record'
 gem 'puma'
 
 group :development do
- gem 'rubocop'     
+ gem 'rubocop'
  gem 'bullet'
  gem 'brakeman'
 end
-    
+
diff --git a/Gemfile.lock b/Gemfile.lock
index e78c9a0..ee86618 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,39 +1,39 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.1.1)
-      actionpack (= 5.1.1)
+    actioncable (5.1.4)
+      actionpack (= 5.1.4)
       nio4r (~> 2.0)
       websocket-driver (~> 0.6.1)
-    actionmailer (5.1.1)
-      actionpack (= 5.1.1)
-      actionview (= 5.1.1)
-      activejob (= 5.1.1)
+    actionmailer (5.1.4)
+      actionpack (= 5.1.4)
+      actionview (= 5.1.4)
+      activejob (= 5.1.4)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.1)
-      actionview (= 5.1.1)
-      activesupport (= 5.1.1)
+    actionpack (5.1.4)
+      actionview (= 5.1.4)
+      activesupport (= 5.1.4)
       rack (~> 2.0)
-      rack-test (~> 0.6.3)
+      rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.1)
-      activesupport (= 5.1.1)
+    actionview (5.1.4)
+      activesupport (= 5.1.4)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.1)
-      activesupport (= 5.1.1)
+    activejob (5.1.4)
+      activesupport (= 5.1.4)
       globalid (>= 0.3.6)
-    activemodel (5.1.1)
-      activesupport (= 5.1.1)
-    activerecord (5.1.1)
-      activemodel (= 5.1.1)
-      activesupport (= 5.1.1)
+    activemodel (5.1.4)
+      activesupport (= 5.1.4)
+    activerecord (5.1.4)
+      activemodel (= 5.1.4)
+      activesupport (= 5.1.4)
       arel (~> 8.0)
-    activesupport (5.1.1)
+    activesupport (5.1.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
@@ -41,12 +41,12 @@ GEM
     arel (8.0.0)
     ast (2.3.0)
     bcrypt (3.1.11)
-    brakeman (3.7.2)
+    brakeman (4.0.1)
     builder (3.2.3)
-    bullet (5.6.1)
+    bullet (5.7.0)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.10.0)
-    cancancan (2.0.0)
+    cancancan (2.1.2)
     coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0)
@@ -55,6 +55,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.0.5)
+    crass (1.0.3)
     dalli (2.7.6)
     delayed_job (4.1.3)
       activesupport (>= 3.0, < 5.2)
@@ -67,11 +68,12 @@ GEM
       railties (>= 4.1.0, < 5.2)
       responders
       warden (~> 1.2.3)
-    erubi (1.6.1)
+    erubi (1.7.0)
     execjs (2.7.0)
-    globalid (0.4.0)
+    globalid (0.4.1)
       activesupport (>= 4.2.0)
-    i18n (0.8.6)
+    i18n (0.9.1)
+      concurrent-ruby (~> 1.0)
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
@@ -81,42 +83,41 @@ GEM
       thor (>= 0.14, < 2.0)
     json (1.8.6)
     libv8 (3.16.14.19)
-    loofah (2.0.3)
+    loofah (2.1.1)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    mail (2.6.6)
-      mime-types (>= 1.16, < 4)
-    method_source (0.8.2)
-    mime-types (3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
-    mini_portile2 (2.2.0)
+    mail (2.7.0)
+      mini_mime (>= 0.1.1)
+    method_source (0.9.0)
+    mini_mime (1.0.0)
+    mini_portile2 (2.3.0)
     minitest (5.10.3)
     multi_json (1.12.2)
-    mysql2 (0.4.9)
-    newrelic_rpm (4.4.0.336)
+    mysql2 (0.4.10)
+    newrelic_rpm (4.6.0.338)
     nio4r (2.1.0)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
+    nokogiri (1.8.1)
+      mini_portile2 (~> 2.3.0)
     orm_adapter (0.5.0)
     parallel (1.12.0)
-    parser (2.4.0.0)
-      ast (~> 2.2)
+    parser (2.4.0.2)
+      ast (~> 2.3)
     powerpack (0.1.1)
-    puma (3.10.0)
+    puma (3.11.0)
     rack (2.0.3)
-    rack-test (0.6.3)
-      rack (>= 1.0)
-    rails (5.1.1)
-      actioncable (= 5.1.1)
-      actionmailer (= 5.1.1)
-      actionpack (= 5.1.1)
-      actionview (= 5.1.1)
-      activejob (= 5.1.1)
-      activemodel (= 5.1.1)
-      activerecord (= 5.1.1)
-      activesupport (= 5.1.1)
-      bundler (>= 1.3.0, < 2.0)
-      railties (= 5.1.1)
+    rack-test (0.8.2)
+      rack (>= 1.0, < 3)
+    rails (5.1.4)
+      actioncable (= 5.1.4)
+      actionmailer (= 5.1.4)
+      actionpack (= 5.1.4)
+      actionview (= 5.1.4)
+      activejob (= 5.1.4)
+      activemodel (= 5.1.4)
+      activerecord (= 5.1.4)
+      activesupport (= 5.1.4)
+      bundler (>= 1.3.0)
+      railties (= 5.1.4)
       sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
@@ -128,15 +129,15 @@ GEM
       rails_stdout_logging
     rails_serve_static_assets (0.0.5)
     rails_stdout_logging (0.0.5)
-    railties (5.1.1)
-      actionpack (= 5.1.1)
-      activesupport (= 5.1.1)
+    railties (5.1.4)
+      actionpack (= 5.1.4)
+      activesupport (= 5.1.4)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (2.2.2)
       rake
-    rake (12.1.0)
+    rake (12.3.0)
     rb-readline (0.5.5)
     rdoc (4.3.0)
     ref (2.0.0)
@@ -144,14 +145,14 @@ GEM
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)
     round_robin_tournament (0.0.1)
-    rubocop (0.49.1)
+    rubocop (0.51.0)
       parallel (~> 1.10)
       parser (>= 2.3.3.1, < 3.0)
       powerpack (~> 0.1)
-      rainbow (>= 1.99.1, < 3.0)
+      rainbow (>= 2.2.2, < 3.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.8.1)
+    ruby-progressbar (1.9.0)
     sdoc (0.4.2)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
@@ -173,9 +174,9 @@ GEM
     turbolinks (5.0.1)
       turbolinks-source (~> 5)
     turbolinks-source (5.0.3)
-    tzinfo (1.2.3)
+    tzinfo (1.2.4)
       thread_safe (~> 0.1)
-    uglifier (3.2.0)
+    uglifier (4.0.2)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.3.0)
     uniform_notifier (1.10.0)
@@ -183,7 +184,7 @@ GEM
       rack (>= 1.0)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.2)
+    websocket-extensions (0.1.3)
 
 PLATFORMS
   ruby
@@ -201,7 +202,7 @@ DEPENDENCIES
   mysql2
   newrelic_rpm
   puma
-  rails (= 5.1.1)
+  rails (= 5.1.4)
   rails_12factor
   rb-readline
   round_robin_tournament
@@ -214,7 +215,7 @@ DEPENDENCIES
   uglifier
 
 RUBY VERSION
-   ruby 2.4.0p0
+   ruby 2.4.2p198
 
 BUNDLED WITH
-   1.15.4
+   1.16.0
diff --git a/rails-dev-Dockerfile b/rails-dev-Dockerfile
index dea3cd8..8aa6a7e 100644
--- a/rails-dev-Dockerfile
+++ b/rails-dev-Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.0
+FROM ruby:2.4.2
 
 RUN apt-get -qq update \
   && apt-get -qq install -y \
diff --git a/rails-prod-Dockerfile b/rails-prod-Dockerfile
index be0ba22..5937155 100644
--- a/rails-prod-Dockerfile
+++ b/rails-prod-Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.0
+FROM ruby:2.4.2
 
 RUN apt-get -qq update \
   && DEBIAN_FRONTEND=noninteractive apt-get -qq install -y \