diff --git a/Pro-4.0-Upgrade.md b/Pro-4.0-Upgrade.md
new file mode 100644
index 00000000..127e07c1
--- /dev/null
+++ b/Pro-4.0-Upgrade.md
@@ -0,0 +1,32 @@
+# Welcome to Sidekiq Pro 4.0!
+
+Sidekiq Pro 4.0 is designed to work with Sidekiq 5.0.
+
+## What's New
+
+* Batches now "die" if any of their jobs die.  You can enumerate the set
+  of dead batches and their associated dead jobs.  The success callback
+  for a dead batch will never fire unless these jobs are fixed.
+```ruby
+Sidekiq::Batch::DeadSet.new.each do |status|
+  status.dead? # => true
+  status.dead_jobs # => [...]
+end
+```
+* The older `reliable_fetch` and `timed_fetch` algorithms have been
+  removed.  Only super\_fetch is available in 4.0.
+* The statsd middleware has been tweaked to remove support for legacy,
+  pre-3.6.0 configuration.
+
+## Upgrade
+
+* Upgrade to the latest Sidekiq Pro 3.x.
+```ruby
+gem 'sidekiq-pro', '< 4'
+```
+* Fix any deprecation warnings you see.
+* Upgrade to 4.x.
+```ruby
+gem 'sidekiq-pro', '< 5'
+```
+
diff --git a/Pro-Changes.md b/Pro-Changes.md
index 77c01ab5..49b05a59 100644
--- a/Pro-Changes.md
+++ b/Pro-Changes.md
@@ -4,6 +4,21 @@
 
 Please see [http://sidekiq.org/](http://sidekiq.org/) for more details and how to buy.
 
+HEAD
+---------
+
+- See the [Sidekiq Pro 4.0](Pro-4.0-Upgrade.md) release notes.
+
+
+3.7.1
+---------
+
+- Deprecate timed\_fetch.  Switch to super\_fetch:
+```ruby
+config.super_fetch!
+```
+
+
 3.7.0
 ---------
 
@@ -11,6 +26,7 @@ Please see [http://sidekiq.org/](http://sidekiq.org/) for more details and how t
   cases with regard to Sidekiq::Shutdown.  This should greatly reduce
   the chances of seeing the long-standing "negative pending count" problem. [#3710]
 
+
 3.6.1
 ---------