diff --git a/lib/dry/effects/all.rb b/lib/dry/effects/all.rb
index 56f9066..6c343d9 100644
--- a/lib/dry/effects/all.rb
+++ b/lib/dry/effects/all.rb
@@ -21,12 +21,11 @@ module Effects
         end
 
         singleton_class.class_eval do
-          define_method(class_name) do |*args|
-            effect_modules.fetch_or_store([key, args]) do
-              ::Dry::Effects.effects[key].new(*args).freeze
+          define_method(class_name) do |*args, **kwargs|
+            effect_modules.fetch_or_store([key, args, kwargs]) do
+              ::Dry::Effects.effects[key].new(*args, **kwargs).freeze
             end
           end
-          ruby2_keywords(class_name) if respond_to?(:ruby2_keywords, true)
         end
       end
 
diff --git a/lib/dry/effects/initializer.rb b/lib/dry/effects/initializer.rb
index 876e337..a387b50 100644
--- a/lib/dry/effects/initializer.rb
+++ b/lib/dry/effects/initializer.rb
@@ -6,22 +6,20 @@ module Initializer
       # @api private
       module DefineWithHook
         # @api private
-        def param(*)
+        def param(...)
           super.tap do
             @params_arity = nil
             __define_with__
           end
         end
-        ruby2_keywords(:param) if respond_to?(:ruby2_keywords, true)
 
         # @api private
-        def option(*)
+        def option(...)
           super.tap do
             __define_with__ unless method_defined?(:with)
             @has_options = true
           end
         end
-        ruby2_keywords(:option) if respond_to?(:ruby2_keywords, true)
 
         # @api private
         def params_arity