diff --git a/CHANGELOG.md b/CHANGELOG.md
index 228c40e..7ae2694 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,15 @@
 # Change Log
 
-## Unreleased
+## Version 1.6.6 - 2015-04-05
+### Changed
+
+*   Upgrade Polyamorous dependency to version 1.2.0, which uses Module#prepend instead of monkey-patching for hooking into Active Record (with Ruby 2.x).
+
+    *Jon Atack*
+
 ### Fixed
 
-*   A better fix for the "undefined method `model_name` for Ransack::Search"
+*   An improved fix for the "undefined method `model_name` for Ransack::Search"
     issue [#518](https://github.com/activerecord-hackery/ransack/issues/518)
     affecting Rails 4.2.1 and 5.0.0. This fix allows us to remove the
     ActionView patch in Ransack version 1.6.4.
@@ -18,11 +24,17 @@
 
     *Nahuel Cuesta Luengo*
 
+*   Fix RubyGems YARD rendering of the README docs.
+
+    *Jon Atack*
+
 ### Added
 
 *   Add the Ruby version to the the header message that shows the database,
     Active Record and Arel versions when running tests.
 
+*   Add Code Climate analysis.
+
     *Jon Atack*
 
 
diff --git a/README.md b/README.md
index 0f27876..4f46674 100644
--- a/README.md
+++ b/README.md
@@ -30,19 +30,19 @@ If you're viewing this at
 [github.com/activerecord-hackery/ransack](https://github.com/activerecord-hackery/ransack),
 you're reading the documentation for the master branch with the latest features.
 [View documentation for the last release (1.6.6).]
-(https://github.com/activerecord-hackery/ransack/tree/v1.6.5)
+(https://github.com/activerecord-hackery/ransack/tree/v1.6.6)
 
 ## Getting started
 
 Ransack is compatible with Rails 3 and 4 (including 4.2.1) on Ruby 1.9 and
-later. It currently works with Rails 5 as well, though changes in Arel and
-Active Record keep that a moving target. If you are using Ruby 1.8, you can use
-an earlier version of Ransack up to v1.3.0.
+later (Ruby 2.2 recommended). Ransack currently works with Rails master (5.0.0)
+too! If you are using Ruby 1.8, you can use an earlier version of Ransack up to
+1.3.0.
 
 Ransack works out-of-the-box with Active Record and also features experimental
 support for Mongoid 4.0 (without associations, further details below).
 
-In your Gemfile, for the last officially released Ransack gem:
+In your Gemfile, for the last officially released gem:
 
 ```ruby
 gem 'ransack'
diff --git a/lib/ransack/version.rb b/lib/ransack/version.rb
index e464338..749ac2b 100644
--- a/lib/ransack/version.rb
+++ b/lib/ransack/version.rb
@@ -1,3 +1,3 @@
 module Ransack
-  VERSION = "1.6.5"
+  VERSION = '1.6.6'
 end