diff --git a/.travis.yml b/.travis.yml
index 8db2d25..a98d6fa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: ruby
 services:
 - docker
 rvm:
-- 2.5.1
+- 2.4.4
 env:
 - DB=sqlite
 script:
diff --git a/Gemfile b/Gemfile
index 500aed0..6def1d1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '2.5.1'
+ruby '2.4.4'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '5.2.0'
 # Use sqlite3 as the database for Active Record
@@ -52,7 +52,7 @@ gem 'cancancan'
 gem 'round_robin_tournament'
 gem 'rb-readline'
 gem 'delayed_job_active_record'
-#gem 'puma'
+gem 'puma'
 gem 'passenger'
 gem 'travis'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 806ed73..19680c8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,17 +149,18 @@ GEM
       mini_portile2 (~> 2.3.0)
     orm_adapter (0.5.0)
     parallel (1.12.1)
-    parser (2.5.1.0)
+    parser (2.5.1.2)
       ast (~> 2.4.0)
     passenger (5.3.3)
       rack
       rake (>= 0.8.1)
     powerpack (0.1.2)
+    puma (3.12.0)
     pusher-client (0.6.2)
       json
       websocket (~> 1.0)
     rack (2.0.5)
-    rack-test (1.0.0)
+    rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)
       actioncable (= 5.2.0)
@@ -203,10 +204,10 @@ GEM
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
     round_robin_tournament (0.0.1)
-    rubocop (0.58.0)
+    rubocop (0.58.1)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.5)
+      parser (>= 2.5, != 2.5.1.1)
       powerpack (~> 0.1)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
@@ -247,7 +248,7 @@ GEM
       ethon (>= 0.8.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.14)
+    uglifier (4.1.15)
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
@@ -278,6 +279,7 @@ DEPENDENCIES
   mysql2
   newrelic_rpm
   passenger
+  puma
   rails (= 5.2.0)
   rails_12factor
   rb-readline
@@ -292,7 +294,7 @@ DEPENDENCIES
   uglifier
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 2.4.4p296
 
 BUNDLED WITH
-   1.16.1
+   1.16.2
diff --git a/Procfile b/Procfile
index bc4cbfd..d7674de 100644
--- a/Procfile
+++ b/Procfile
@@ -1,3 +1,3 @@
 worker: bundle exec rake jobs:work
-#web: bundle exec puma -t 5:5 -p ${PORT:-3000} -e ${RACK_ENV:-development}
-web: bundle exec passenger start -p $PORT --max-pool-size 3
+web: bundle exec puma -t 5:5 -p ${PORT:-3000} -e ${RACK_ENV:-development}
+#web: bundle exec passenger start -p $PORT --max-pool-size 3
diff --git a/deploy/rails-dev-Dockerfile b/deploy/rails-dev-Dockerfile
index 1202443..003244d 100644
--- a/deploy/rails-dev-Dockerfile
+++ b/deploy/rails-dev-Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.5.1
+FROM ruby:2.4.4
 
 RUN apt-get -qq update \
   && apt-get -qq install -y \
diff --git a/deploy/rails-prod-Dockerfile b/deploy/rails-prod-Dockerfile
index f204733..902858f 100644
--- a/deploy/rails-prod-Dockerfile
+++ b/deploy/rails-prod-Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.5.1
+FROM ruby:2.4.4
 
 HEALTHCHECK --start-period=30s CMD curl --insecure https://127.0.0.1/
 
@@ -70,5 +70,5 @@ RUN RAILS_ENV=production bundle exec rake assets:precompile
 
 # By default, simply start puma.
 WORKDIR /rails
-#CMD bundle exec puma -t 3:3 -b 'ssl://0.0.0.0:443?key=/ssl/server.key&verify_mode=none&cert=/ssl/server.crt'  -e production
-CMD bundle exec passenger start -p 443 --max-pool-size 3 --environment production --ssl --ssl-certificate /ssl/server.crt --ssl-certificate-key /ssl/server.key
\ No newline at end of file
+CMD bundle exec puma -t 3:3 -b 'ssl://0.0.0.0:443?key=/ssl/server.key&verify_mode=none&cert=/ssl/server.crt'  -e production
+#CMD bundle exec passenger start -p 443 --max-pool-size 3 --environment production --ssl --ssl-certificate /ssl/server.crt --ssl-certificate-key /ssl/server.key
\ No newline at end of file