diff --git a/lib/active_interaction/extras/filters/uuid_filter.rb b/lib/active_interaction/extras/filters/uuid_filter.rb
index e531b1c..2c43df1 100644
--- a/lib/active_interaction/extras/filters/uuid_filter.rb
+++ b/lib/active_interaction/extras/filters/uuid_filter.rb
@@ -3,7 +3,7 @@
 class ActiveInteraction::Extras::Filters::UUIDFilter < ActiveInteraction::StringFilter
   register :uuid
 
-  REGEX = /^[0-9A-F]{8}-[0-9A-F]{4}-[4][0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i.freeze
+  REGEX = /^[0-9A-F]{8}-[0-9A-F]{4}-[47][0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i.freeze
 
   def matches?(value)
     super && REGEX.match?(value)