Some important upgrading information ==================================== Upgrading to 0.1.9 ------------------ The "safely" method and logging of backtraces functionality of daemon-kit has now been extracted into a separate gem called 'safely', which is available on github at https://github.com/kennethkalmer/safely. You now need to add 'safely' to your Gemfile like so: gem "safely" And update your _environment.rb_ to no longer configure the _safety_net_ attribute (which has been removed completely and will result in an undefined method exception). To configure safely, make an initializer with your configuration. Alternatively you generate a new daemon and copy the safely initializer into your current project as a reference.