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+# Update from 4.2 to 4.3
+
+## GitLab CI 4.x requires GitLab 6.3 or higher
+
+### 1. stop CI server
+
+    sudo service gitlab_ci stop
+
+### 2. Switch to your gitlab_ci user
+
+```
+sudo su gitlab_ci
+cd /home/gitlab_ci/gitlab-ci
+```
+
+### 3. get latest code
+
+```
+git fetch
+git checkout 4-3-stable
+```
+
+### 4. Install libs, migrations etc
+
+Edit web server settings
+
+```
+cp config/unicorn.rb.example config/unicorn.rb
+editor config/unicorn.rb
+```
+
+Then:
+
+```
+# For MySQL users
+bundle install --without postgres development test --deployment
+
+# For Postgres users
+bundle install --without mysql development test --deployment
+
+# Run migrations
+bundle exec rake db:migrate RAILS_ENV=production
+```
+
+### 5. Setup unicorn
+```
+cp config/unicorn.rb.example config/unicorn.rb
+```
+
+### 6. Install the new init script
+As a user with sudo rights:
+
+```
+cd /home/gitlab_ci/gitlab-ci
+sudo cp lib/support/init.d/gitlab_ci /etc/init.d/gitlab_ci
+sudo chmod +x /etc/init.d/gitlab_ci
+```
+
+### 7. Start web application
+
+    sudo service gitlab_ci start