diff --git a/lib/metanorma/ribose/isodoc.rng b/lib/metanorma/ribose/isodoc.rng
index 3a71baa..96243b5 100644
--- a/lib/metanorma/ribose/isodoc.rng
+++ b/lib/metanorma/ribose/isodoc.rng
@@ -2504,6 +2504,16 @@
           <text/>
         </element>
       </optional>
+      <optional>
+        <element name="amendment">
+          <text/>
+        </element>
+      </optional>
+      <optional>
+        <element name="corrigendum">
+          <text/>
+        </element>
+      </optional>
       <optional>
         <element name="language">
           <text/>
diff --git a/lib/metanorma/ribose/version.rb b/lib/metanorma/ribose/version.rb
index 073cc5e..ec5b91d 100644
--- a/lib/metanorma/ribose/version.rb
+++ b/lib/metanorma/ribose/version.rb
@@ -1,5 +1,5 @@
 module Metanorma
   module Ribose
-    VERSION = "2.1.4".freeze
+    VERSION = "2.1.5".freeze
   end
 end