diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce18b9c7d..5efb7da38 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,21 @@
 This project follows [semver 2.0.0](http://semver.org/spec/v2.0.0.html) and the
 recommendations of [keepachangelog.com](http://keepachangelog.com/).
 
-## 6.0.0 (Unreleased)
+## Unreleased
+
+### Breaking Changes
+
+- None
+
+### Added
+
+- None
+
+### Fixed
+
+- None
+
+## 6.0.0 (2016-12-03)
 
 Now with rails 5.1 support, and less model pollution! About 40 methods that were
 polluting your models' namespaces have been removed, reducing the chances of a
diff --git a/README.md b/README.md
index 60bea0086..df1e7c5fc 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ has been destroyed.
 
 | Version        | Documentation |
 | -------------- | ------------- |
-| Unreleased     | https://github.com/airblade/paper_trail/blob/master/README.md |
+| 6.0.0          | https://github.com/airblade/paper_trail/blob/master/README.md |
 | 5.2.3          | https://github.com/airblade/paper_trail/blob/v5.2.3/README.md |
 | 4.2.0          | https://github.com/airblade/paper_trail/blob/v4.2.0/README.md |
 | 3.0.9          | https://github.com/airblade/paper_trail/blob/v3.0.9/README.md |
@@ -62,7 +62,7 @@ has been destroyed.
 
 | paper_trail    | branch     | tags   | ruby     | activerecord  |
 | -------------- | ---------- | ------ | -------- | ------------- |
-| 6 (unreleased) | master     |        | >= 1.9.3 | >= 4.0, < 6   |
+| 6              | master     | v6.x   | >= 1.9.3 | >= 4.0, < 6   |
 | 5              | 5-stable   | v5.x   | >= 1.9.3 | >= 3.0, < 5.1 |
 | 4              | 4-stable   | v4.x   | >= 1.8.7 | >= 3.0, < 5.1 |
 | 3              | 3.0-stable | v3.x   | >= 1.8.7 | >= 3.0, < 5   |
diff --git a/lib/paper_trail/record_trail.rb b/lib/paper_trail/record_trail.rb
index aefb74910..05b66a2f7 100644
--- a/lib/paper_trail/record_trail.rb
+++ b/lib/paper_trail/record_trail.rb
@@ -456,6 +456,42 @@ def add_transaction_id_to(data)
       data[:transaction_id] = PaperTrail.transaction_id
     end
 
+    # @api private
+    def attribute_changed_in_latest_version?(attr_name)
+      if @in_after_callback && RAILS_GTE_5_1
+        @record.saved_change_to_attribute?(attr_name.to_s)
+      else
+        @record.attribute_changed?(attr_name.to_s)
+      end
+    end
+
+    # @api private
+    def attribute_in_previous_version(attr_name)
+      if @in_after_callback && RAILS_GTE_5_1
+        @record.attribute_before_last_save(attr_name.to_s)
+      else
+        @record.attribute_was(attr_name.to_s)
+      end
+    end
+
+    # @api private
+    def changed_in_latest_version
+      if @in_after_callback && RAILS_GTE_5_1
+        @record.saved_changes.keys
+      else
+        @record.changed
+      end
+    end
+
+    # @api private
+    def changes_in_latest_version
+      if @in_after_callback && RAILS_GTE_5_1
+        @record.saved_changes
+      else
+        @record.changes
+      end
+    end
+
     # Given a HABTM association, returns an array of ids.
     # @api private
     def habtm_assoc_ids(habtm_assoc)
@@ -502,37 +538,5 @@ def version
     def versions
       @record.public_send(@record.class.versions_association_name)
     end
-
-    def attribute_in_previous_version(attr_name)
-      if @in_after_callback && RAILS_GTE_5_1
-        @record.attribute_before_last_save(attr_name.to_s)
-      else
-        @record.attribute_was(attr_name.to_s)
-      end
-    end
-
-    def changed_in_latest_version
-      if @in_after_callback && RAILS_GTE_5_1
-        @record.saved_changes.keys
-      else
-        @record.changed
-      end
-    end
-
-    def changes_in_latest_version
-      if @in_after_callback && RAILS_GTE_5_1
-        @record.saved_changes
-      else
-        @record.changes
-      end
-    end
-
-    def attribute_changed_in_latest_version?(attr_name)
-      if @in_after_callback && RAILS_GTE_5_1
-        @record.saved_change_to_attribute?(attr_name.to_s)
-      else
-        @record.attribute_changed?(attr_name.to_s)
-      end
-    end
   end
 end
diff --git a/lib/paper_trail/version_number.rb b/lib/paper_trail/version_number.rb
index b7497fbde..6ceb05849 100644
--- a/lib/paper_trail/version_number.rb
+++ b/lib/paper_trail/version_number.rb
@@ -4,7 +4,7 @@ module VERSION
     MAJOR = 6
     MINOR = 0
     TINY = 0
-    PRE = "pre".freeze
+    PRE = nil
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".").freeze
 
diff --git a/paper_trail.gemspec b/paper_trail.gemspec
index 8f94bb42e..ba583209b 100644
--- a/paper_trail.gemspec
+++ b/paper_trail.gemspec
@@ -20,11 +20,8 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = ">= 1.3.6"
   s.required_ruby_version = ">= 1.9.3"
 
-  # Rails 5.1 will deprecate the current behavior of AR::Dirty
-  # (https://github.com/rails/rails/pull/25337) which is pretty important
-  # to PT. I haven't found good instructions yet on how to upgrade, but
-  # Sean Griffin described it as easy, on his podcast (http://bikeshed.fm/87).
-  s.add_dependency "activerecord", [">= 4.0", "< 5.1"]
+  # Rails does not follow semver, makes breaking changes in minor versions.
+  s.add_dependency "activerecord", [">= 4.0", "< 5.2"]
   s.add_dependency "request_store", "~> 1.1"
 
   s.add_development_dependency "appraisal", "~> 2.1"