diff --git a/.travis.yml b/.travis.yml
index a98d6fa..8db2d25 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: ruby
 services:
 - docker
 rvm:
-- 2.4.4
+- 2.5.1
 env:
 - DB=sqlite
 script:
diff --git a/Gemfile b/Gemfile
index 320b4d2..48e0e1c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
-ruby '2.4.4'
+ruby '2.5.1'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '5.1.6'
+gem 'rails', '5.2.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', :group => :development
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 7ffd591..25d8381 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,51 +1,55 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.1.6)
-      actionpack (= 5.1.6)
+    actioncable (5.2.1)
+      actionpack (= 5.2.1)
       nio4r (~> 2.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.1.6)
-      actionpack (= 5.1.6)
-      actionview (= 5.1.6)
-      activejob (= 5.1.6)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.1)
+      actionpack (= 5.2.1)
+      actionview (= 5.2.1)
+      activejob (= 5.2.1)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.6)
-      actionview (= 5.1.6)
-      activesupport (= 5.1.6)
+    actionpack (5.2.1)
+      actionview (= 5.2.1)
+      activesupport (= 5.2.1)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.6)
-      activesupport (= 5.1.6)
+    actionview (5.2.1)
+      activesupport (= 5.2.1)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.6)
-      activesupport (= 5.1.6)
+    activejob (5.2.1)
+      activesupport (= 5.2.1)
       globalid (>= 0.3.6)
-    activemodel (5.1.6)
-      activesupport (= 5.1.6)
-    activerecord (5.1.6)
-      activemodel (= 5.1.6)
-      activesupport (= 5.1.6)
-      arel (~> 8.0)
-    activesupport (5.1.6)
+    activemodel (5.2.1)
+      activesupport (= 5.2.1)
+    activerecord (5.2.1)
+      activemodel (= 5.2.1)
+      activesupport (= 5.2.1)
+      arel (>= 9.0)
+    activestorage (5.2.1)
+      actionpack (= 5.2.1)
+      activerecord (= 5.2.1)
+      marcel (~> 0.3.1)
+    activesupport (5.2.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.4.0)
-    arel (8.0.0)
+    arel (9.0.0)
     ast (2.4.0)
     backports (3.11.3)
     bcrypt (3.1.12)
     brakeman (4.3.1)
     builder (3.2.3)
-    bullet (5.7.5)
+    bullet (5.7.6)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11.0)
     cancancan (2.2.0)
@@ -67,7 +71,7 @@ GEM
     delayed_job_active_record (4.1.3)
       activerecord (>= 3.0, < 5.3)
       delayed_job (>= 3.0, < 5)
-    devise (4.4.3)
+    devise (4.5.0)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
       railties (>= 4.1.0, < 6.0)
@@ -105,7 +109,7 @@ GEM
     highline (1.7.10)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
-    i18n (1.0.1)
+    i18n (1.1.0)
       concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.1)
     jbuilder (2.7.0)
@@ -124,11 +128,14 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
+    marcel (0.3.2)
+      mimemagic (~> 0.3.2)
     method_source (0.9.0)
-    mime-types (3.1)
+    mime-types (3.2.2)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
-    mini_mime (1.0.0)
+    mime-types-data (3.2018.0812)
+    mimemagic (0.3.2)
+    mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     multi_json (1.13.1)
@@ -156,17 +163,18 @@ GEM
     rack (2.0.5)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.1.6)
-      actioncable (= 5.1.6)
-      actionmailer (= 5.1.6)
-      actionpack (= 5.1.6)
-      actionview (= 5.1.6)
-      activejob (= 5.1.6)
-      activemodel (= 5.1.6)
-      activerecord (= 5.1.6)
-      activesupport (= 5.1.6)
+    rails (5.2.1)
+      actioncable (= 5.2.1)
+      actionmailer (= 5.2.1)
+      actionpack (= 5.2.1)
+      actionview (= 5.2.1)
+      activejob (= 5.2.1)
+      activemodel (= 5.2.1)
+      activerecord (= 5.2.1)
+      activestorage (= 5.2.1)
+      activesupport (= 5.2.1)
       bundler (>= 1.3.0)
-      railties (= 5.1.6)
+      railties (= 5.2.1)
       sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
@@ -178,12 +186,12 @@ GEM
       rails_stdout_logging
     rails_serve_static_assets (0.0.5)
     rails_stdout_logging (0.0.5)
-    railties (5.1.6)
-      actionpack (= 5.1.6)
-      activesupport (= 5.1.6)
+    railties (5.2.1)
+      actionpack (= 5.2.1)
+      activesupport (= 5.2.1)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
+      thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (12.3.1)
     rb-readline (0.5.5)
@@ -205,7 +213,7 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.9.0)
+    ruby-progressbar (1.10.0)
     sdoc (1.0.0)
       rdoc (>= 5.0)
     spring (2.0.2)
@@ -225,7 +233,7 @@ GEM
       ref
     thor (0.20.0)
     thread_safe (0.3.6)
-    travis (1.8.8)
+    travis (1.8.9)
       backports
       faraday (~> 0.9)
       faraday_middleware (~> 0.9, >= 0.9.1)
@@ -234,16 +242,16 @@ GEM
       launchy (~> 2.1)
       pusher-client (~> 0.4)
       typhoeus (~> 0.6, >= 0.6.8)
-    turbolinks (5.1.1)
-      turbolinks-source (~> 5.1)
-    turbolinks-source (5.1.0)
+    turbolinks (5.2.0)
+      turbolinks-source (~> 5.2)
+    turbolinks-source (5.2.0)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     tzinfo-data (1.2018.5)
       tzinfo (>= 1.0.0)
-    uglifier (4.1.17)
+    uglifier (4.1.18)
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
@@ -253,7 +261,7 @@ GEM
     warden (1.2.7)
       rack (>= 1.0)
     websocket (1.2.8)
-    websocket-driver (0.6.5)
+    websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
 
@@ -276,7 +284,7 @@ DEPENDENCIES
   newrelic_rpm
   passenger
   puma
-  rails (= 5.1.6)
+  rails (= 5.2.1)
   rails_12factor
   rb-readline
   round_robin_tournament
@@ -291,7 +299,7 @@ DEPENDENCIES
   uglifier
 
 RUBY VERSION
-   ruby 2.4.4p296
+   ruby 2.5.1p57
 
 BUNDLED WITH
    1.16.2
diff --git a/deploy/rails-dev-Dockerfile b/deploy/rails-dev-Dockerfile
index 003244d..1202443 100644
--- a/deploy/rails-dev-Dockerfile
+++ b/deploy/rails-dev-Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.4
+FROM ruby:2.5.1
 
 RUN apt-get -qq update \
   && apt-get -qq install -y \
diff --git a/deploy/rails-prod-Dockerfile b/deploy/rails-prod-Dockerfile
index e9957f1..05a2297 100644
--- a/deploy/rails-prod-Dockerfile
+++ b/deploy/rails-prod-Dockerfile
@@ -2,8 +2,8 @@ FROM ubuntu:xenial
 
 HEALTHCHECK --start-period=30s CMD curl --insecure https://127.0.0.1/
 
-ENV RUBY_VERSION=2.4.4
-ENV RUBY_MAJOR_VERSION=2.4
+ENV RUBY_VERSION=2.5.1
+ENV RUBY_MAJOR_VERSION=2.5
 
 ENV TINI_VERSION v0.18.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini