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# Welcome to Sidekiq Pro 3.0!
Sidekiq Pro 3.0 is designed to work with Sidekiq 4.0.
## What's New
* **Redis 2.8.0 or greater is required.** Redis 2.8 was released two years
ago and contains **many** useful features which Sidekiq couldn't
leverage until now. **Redis 3.0.3 or greater is recommended** for large
scale use.
* Sidekiq Pro no longer uses Celluloid. If your application code uses Celluloid,
you will need to pull it in yourself.
* Pausing and unpausing queues is now instantaneous, no more polling!
* Reliable fetch has been re-implemented due to the fetch changes in
Sidekiq 4.0.
* Support for platforms without persistent hostnames. Since the reliable\_fetch
algorithm requires a persistent hostname, an alternative reliability
algorithm is now available for platforms like Heroku and Docker:
```ruby
Sidekiq.configure_server do |config|
config.timed_fetch!
end
```
The wiki contains [much more detail about each reliability option](https://github.com/mperham/sidekiq/wiki/Pro-Reliability-Server).
* The old 'sidekiq/notifications' features have been removed.
## Upgrade
First, make sure you are using Redis 2.8 or greater. Next:
* Upgrade to the latest Sidekiq Pro 2.x.
```ruby
gem 'sidekiq-pro', '< 3'
```
* Fix any deprecation warnings you see.
* Upgrade to 3.x.
```ruby
gem 'sidekiq-pro', '< 4'
```
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