diff --git a/lib/dry/types/builder.rb b/lib/dry/types/builder.rb
index e647d713..51761b27 100644
--- a/lib/dry/types/builder.rb
+++ b/lib/dry/types/builder.rb
@@ -72,8 +72,8 @@ def optional
       # @return [Constrained]
       #
       # @api public
-      def constrained(options)
-        constrained_type.new(self, rule: Types.Rule(options))
+      def constrained(...)
+        constrained_type.new(self, rule: Types.Rule(...))
       end
 
       # Turn a type into a type with a default value
diff --git a/lib/dry/types/sum.rb b/lib/dry/types/sum.rb
index 2dd60c32..506ab313 100644
--- a/lib/dry/types/sum.rb
+++ b/lib/dry/types/sum.rb
@@ -84,9 +84,9 @@ def meta(data = Undefined)
       # @see Builder#constrained
       #
       # @api public
-      def constrained(options)
+      def constrained(...)
         if optional?
-          right.constrained(options).optional
+          right.constrained(...).optional
         else
           super
         end