diff --git a/.gitignore b/.gitignore
index 5137135a..cecd43c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,5 @@ config/twitter.yml
 .DS_Store
 public/assets
 coverage/
+docker-compose.override.yml
+node_modules/
diff --git a/app/models/tomato.rb b/app/models/tomato.rb
index 17a3200d..37ab252b 100644
--- a/app/models/tomato.rb
+++ b/app/models/tomato.rb
@@ -16,7 +16,7 @@ class Tomato
   after_create :increment_score
   after_destroy :decrement_score
 
-  DURATION       = Rails.env.development? ? 25 : 25 * 60 # pomodoro default duration in seconds
+  DURATION       = Rails.env.development? ? ENV.fetch("DURATION", 25).to_i : 25 * 60 # pomodoro default duration in seconds
   BREAK_DURATION = Rails.env.development? ? 5  : 5 * 60  # pomodoro default break duration in seconds
 
   include ActionView::Helpers::TextHelper
diff --git a/config/initializers/omniauth.rb b/config/initializers/omniauth.rb
index 4610d068..2f4f85a9 100644
--- a/config/initializers/omniauth.rb
+++ b/config/initializers/omniauth.rb
@@ -1,4 +1,4 @@
-if Rails.env.production?
+if ENV.has_key? 'GITHUB_CLIENT_ID'
   GITHUB = {
     'client_id' => ENV['GITHUB_CLIENT_ID'],
     'client_secret' => ENV['GITHUB_CLIENT_SECRET']
diff --git a/docker-compose.yml b/docker-compose.yml
index 6b9ee06d..277877d2 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,7 @@
 version: '3'
 services:
   mongo:
-    image: mongo
+    image: mongo:4
     ports:
     - 27017:27017
 
@@ -10,10 +10,14 @@ services:
     build: .
     volumes:
       - .:/tomatoes
+    tmpfs:
+      - /tomatoes/tmp
     entrypoint: ./docker-entrypoint.sh
     ports:
-      - 3000:3000
+      - 4000:3000
     depends_on:
       - mongo
     environment:
       - DO_HOST=mongo
+      - DURATION=1500
+      - BREAK_DURATION=300