diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71008c9..e7fbfbf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,25 @@
 
 All notable changes to this project will be documented in this file.
 
+## [6.5.0] - 2021-02-07
+
+### Added
+
+- Added ability to normalize throttle discriminator by setting `Rack::Attack.throttle_discriminator_normalizer` (@fatkodima)
+
+  Example:
+
+      Rack::Attack.throttle_discriminator_normalizer = ->(discriminator) { ... }
+
+  or disable default normalization with:
+
+      Rack::Attack.throttle_discriminator_normalizer = nil
+
+### Removed
+
+- Dropped support for ruby v2.4
+- Dropped support for rails v5.1
+
 ## [6.4.0] - 2021-01-23
 
 ### Added
@@ -232,6 +251,7 @@ so your custom code is less prone to race conditions ([#282](https://github.com/
  - Remove unused variable
  - Extract mandatory options to constants
 
+[6.5.0]: https://github.com/rack/rack-attack/compare/v6.4.0...v6.5.0/
 [6.4.0]: https://github.com/rack/rack-attack/compare/v6.3.1...v6.4.0/
 [6.3.1]: https://github.com/rack/rack-attack/compare/v6.3.0...v6.3.1/
 [6.3.0]: https://github.com/rack/rack-attack/compare/v6.2.2...v6.3.0/
diff --git a/lib/rack/attack.rb b/lib/rack/attack.rb
index 47ba82f..bc9dbed 100644
--- a/lib/rack/attack.rb
+++ b/lib/rack/attack.rb
@@ -31,7 +31,7 @@ module Rack
     autoload :Allow2Ban,            'rack/attack/allow2ban'
 
     class << self
-      attr_accessor :enabled, :notifier, :discriminator_normalizer
+      attr_accessor :enabled, :notifier, :throttle_discriminator_normalizer
       attr_reader :configuration
 
       def instrument(request)
@@ -87,7 +87,7 @@ module Rack
     # Set defaults
     @enabled = true
     @notifier = ActiveSupport::Notifications if defined?(ActiveSupport::Notifications)
-    @discriminator_normalizer = lambda do |discriminator|
+    @throttle_discriminator_normalizer = lambda do |discriminator|
       discriminator.to_s.strip.downcase
     end
     @configuration = Configuration.new
diff --git a/lib/rack/attack/throttle.rb b/lib/rack/attack/throttle.rb
index 1cc50f4..6992339 100644
--- a/lib/rack/attack/throttle.rb
+++ b/lib/rack/attack/throttle.rb
@@ -51,8 +51,8 @@ module Rack
 
       def discriminator_for(request)
         discriminator = block.call(request)
-        if discriminator && Rack::Attack.discriminator_normalizer
-          discriminator = Rack::Attack.discriminator_normalizer.call(discriminator)
+        if discriminator && Rack::Attack.throttle_discriminator_normalizer
+          discriminator = Rack::Attack.throttle_discriminator_normalizer.call(discriminator)
         end
         discriminator
       end
diff --git a/lib/rack/attack/version.rb b/lib/rack/attack/version.rb
index fb11922..0c28e15 100644
--- a/lib/rack/attack/version.rb
+++ b/lib/rack/attack/version.rb
@@ -2,6 +2,6 @@
 
 module Rack
   class Attack
-    VERSION = '6.4.0'
+    VERSION = '6.5.0'
   end
 end
diff --git a/spec/rack_attack_throttle_spec.rb b/spec/rack_attack_throttle_spec.rb
index feb599c..0b0d68a 100644
--- a/spec/rack_attack_throttle_spec.rb
+++ b/spec/rack_attack_throttle_spec.rb
@@ -145,7 +145,7 @@ describe 'Rack::Attack.throttle with block retuning nil' do
   end
 end
 
-describe 'Rack::Attack.throttle with discriminator_normalizer' do
+describe 'Rack::Attack.throttle with throttle_discriminator_normalizer' do
   before do
     @period = 60
     @emails = [
@@ -161,16 +161,16 @@ describe 'Rack::Attack.throttle with discriminator_normalizer' do
     end
   end
 
-  it 'should not differentiate requests when discriminator_normalizer is enabled' do
+  it 'should not differentiate requests when throttle_discriminator_normalizer is enabled' do
     post_logins
     key = "rack::attack:#{Time.now.to_i / @period}:logins/email:person@example.com"
     _(Rack::Attack.cache.store.read(key)).must_equal 3
   end
 
-  it 'should differentiate requests when discriminator_normalizer is disabled' do
+  it 'should differentiate requests when throttle_discriminator_normalizer is disabled' do
     begin
-      prev = Rack::Attack.discriminator_normalizer
-      Rack::Attack.discriminator_normalizer = nil
+      prev = Rack::Attack.throttle_discriminator_normalizer
+      Rack::Attack.throttle_discriminator_normalizer = nil
 
       post_logins
       @emails.each do |email|
@@ -178,7 +178,7 @@ describe 'Rack::Attack.throttle with discriminator_normalizer' do
         _(Rack::Attack.cache.store.read(key)).must_equal 1
       end
     ensure
-      Rack::Attack.discriminator_normalizer = prev
+      Rack::Attack.throttle_discriminator_normalizer = prev
     end
   end