diff --git a/.ruby-version b/.ruby-version
index b1b25a5..bc4abe8 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.2.2
+2.3.8
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..6871cf1
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,18 @@
+FROM ruby:2.3.8
+
+ENV RAILS_ENV=production
+
+RUN apt update && apt install -y nodejs cmake
+
+WORKDIR /app
+
+COPY ./Gemfile ./Gemfile.lock /app/
+
+RUN gem install bundler
+
+COPY . /app
+
+RUN bundle install
+
+
+CMD bundle exec rails s -b 0.0.0.0
diff --git a/Gemfile b/Gemfile
index e36c33a..bc63db7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -104,7 +104,7 @@ gem 'friendly_id'
 gem 'jquery-turbolinks'
 
 # Use datenfisch (https://github.com/Iasoon/datenfisch.git)
-gem 'datenfisch', git: 'git://github.com/iasoon/datenfisch-sucks.git',
+gem 'datenfisch', git: 'https://github.com/iasoon/datenfisch-sucks.git',
                   ref: '4f39bb3686b5facfb2552fe186d568ce3d259993'
 
 # Use jQuery plugin datatables (https://github.com/DataTables/DataTables)
diff --git a/config/initializers/devise.rb b/config/initializers/devise.rb
index 478b88c..cd73a86 100644
--- a/config/initializers/devise.rb
+++ b/config/initializers/devise.rb
@@ -10,6 +10,8 @@
   # Configure the class responsible to send e-mails.
   # config.mailer = 'Devise::Mailer'
 
+  config.secret_key = '01fc1ab3cb991eb1e4cdb11ee7f99dbdd530da38eda3928627f7ab5c19632d8f47c203b988e29f9c7dc18f619d5bf7da3a682f1dd935d9174f6a2a04d0bae36f'
+
   # ==> ORM configuration
   # Load and configure the ORM. Supports :active_record (default) and
   # :mongoid (bson_ext recommended) by default. Other ORMs may be
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..2571db0
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,32 @@
+version: '3.3'
+
+services:
+  db:
+    image: mariadb:10.8
+    volumes:
+      - db_data:/var/lib/mysql
+    command: ['--character-set-server=utf8mb4', '--collation-server=utf8mb4_unicode_ci']
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD: strong-password
+      MYSQL_DATABASE: gamification
+      MYSQL_USER: gamification
+      MYSQL_PASSWORD: password
+
+  web:
+    build: .
+    depends_on:
+      - db
+    ports:
+      - "3003:3000"
+    restart: always
+    environment:
+      DATABASE_URL: mysql2://gamification:password@db/gamification
+      RAILS_LOG_TO_STDOUT: 1
+      SECRET_AUTH_USERNAME: admin
+      SECRET_AUTH_PASSWORD: admin-password
+      RAILS_SERVE_STATIC_FILES: 1
+
+volumes:
+  db_data: {}
+