diff --git a/lib/ckb/serializers/hash_type_serializer.rb b/lib/ckb/serializers/hash_type_serializer.rb
index 580d4e7..3e503fe 100644
--- a/lib/ckb/serializers/hash_type_serializer.rb
+++ b/lib/ckb/serializers/hash_type_serializer.rb
@@ -26,6 +26,8 @@ def body
           "01"
         when "data1"
           "02"
+        when "data2"
+          "04"
         end
       end
     end