diff --git a/lib/wash_out/param.rb b/lib/wash_out/param.rb
index 83c9bf5e..a6ccdbec 100644
--- a/lib/wash_out/param.rb
+++ b/lib/wash_out/param.rb
@@ -71,6 +71,7 @@ def load(data, key)
           when 'datetime';     :to_datetime
           when 'time';         :to_time
           when 'base64Binary'; lambda{|dat| Base64.decode64(dat)}
+          when 'uuid';         :to_s
           else raise RuntimeError, "Invalid WashOut simple type: #{type}"
         end
 
diff --git a/lib/wash_out/version.rb b/lib/wash_out/version.rb
index f015a044..02ff9bd2 100644
--- a/lib/wash_out/version.rb
+++ b/lib/wash_out/version.rb
@@ -1,3 +1,3 @@
 module WashOut
-  VERSION = "0.12.0"
+  VERSION = "0.12.1"
 end