diff --git a/.travis.yml b/.travis.yml
index 1a66d45..9089076 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: ruby
 
 rvm:
- - '2.2.7'
+ - '2.5.3'
 
 env:
   global:
diff --git a/Gemfile.lock b/Gemfile.lock
index 7a3a58d..44a0511 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    active_model_serializers (0.10.8)
+    active_model_serializers (0.10.9)
       actionpack (>= 4.1, < 6)
       activemodel (>= 4.1, < 6)
       case_transform (>= 0.2)
@@ -52,7 +52,7 @@ GEM
     arel (9.0.0)
     ast (2.4.0)
     builder (3.2.3)
-    byebug (10.0.2)
+    byebug (11.0.0)
     capistrano (3.11.0)
       airbrussh (>= 1.0.0)
       i18n
@@ -81,12 +81,12 @@ GEM
     exception_notification (4.3.0)
       actionmailer (>= 4.0, < 6)
       activesupport (>= 4.0, < 6)
-    globalid (0.4.1)
+    globalid (0.4.2)
       activesupport (>= 4.2.0)
-    i18n (1.5.1)
+    i18n (1.6.0)
       concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.2)
-    json (2.1.0)
+    json (2.2.0)
     jsonapi-renderer (0.2.0)
     jwt (2.1.0)
     kaminari (1.1.1)
@@ -114,20 +114,21 @@ GEM
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
-    mocha (1.7.0)
+    mocha (1.8.0)
       metaclass (~> 0.0.1)
     multi_json (1.13.1)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
-    net-ssh (4.2.0)
+    net-ssh (5.1.0)
     nio4r (2.3.1)
-    nokogiri (1.9.1)
+    nokogiri (1.10.1)
       mini_portile2 (~> 2.4.0)
-    parallel (1.12.1)
-    parser (2.5.3.0)
+    parallel (1.14.0)
+    parser (2.6.0.0)
       ast (~> 2.4.0)
     pg (1.1.4)
     powerpack (0.1.2)
+    psych (3.1.0)
     puma (3.12.0)
     rack (2.0.6)
     rack-cors (1.0.2)
@@ -156,7 +157,7 @@ GEM
       ruby-graphviz (~> 1.2)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
-    rails-i18n (5.1.2)
+    rails-i18n (5.1.3)
       i18n (>= 0.7, < 2)
       railties (>= 5.0, < 6)
     railties (5.2.2)
@@ -167,11 +168,12 @@ GEM
       thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (12.3.2)
-    rubocop (0.62.0)
+    rubocop (0.65.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
       powerpack (~> 0.1)
+      psych (>= 3.1.0)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.4.0)
@@ -192,13 +194,13 @@ GEM
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
     sqlite3 (1.3.13)
-    sshkit (1.18.0)
+    sshkit (1.18.2)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
     streamio-ffmpeg (3.0.2)
       multi_json (~> 1.8)
     swagger-blocks (2.0.2)
-    term-ansicolor (1.7.0)
+    term-ansicolor (1.7.1)
       tins (~> 1.0)
     thor (0.19.4)
     thread_safe (0.3.6)
@@ -237,4 +239,4 @@ DEPENDENCIES
   swagger-blocks
 
 BUNDLED WITH
-   1.16.1
+   1.16.2
diff --git a/doc/deployment.md b/doc/deployment.md
index 69abffc..33597b1 100644
--- a/doc/deployment.md
+++ b/doc/deployment.md
@@ -4,8 +4,8 @@
 
 The following software must be installed on your system:
 
-* Ruby >= 2.2.0
-* PostgreSQL >= 8.0
+* Ruby >= 2.5.0
+* PostgreSQL >= 9.0
 * Ffmpeg >= 2.7.0
 * Apache HTTPD
 * mod_xsendfile
diff --git a/doc/development.md b/doc/development.md
index 2ee4452..502d976 100644
--- a/doc/development.md
+++ b/doc/development.md
@@ -1,6 +1,6 @@
 # Development
 
-RAAR is a Ruby application, so you need [Ruby 2.2](https://www.ruby-lang.org/) and [Bundler](http://bundler.io) installed on your system to work on it. For development purposes, a simple [Sqlite](https://www.sqlite.org) database is used by default. You may change the database by setting the respective environment variables described in the [Deployment](deployment.md) documentation. There you'll also find a list of all the other third party libraries required.
+RAAR is a Ruby application, so you need [Ruby 2.5](https://www.ruby-lang.org/) and [Bundler](http://bundler.io) installed on your system to work on it. For development purposes, a simple [Sqlite](https://www.sqlite.org) database is used by default. You may change the database by setting the respective environment variables described in the [Deployment](deployment.md) documentation. There you'll also find a list of all the other third party libraries required.
 
 Once everything is set up and you cloned the Git repository, install all required Gems and prepare the Sqlite3 database with: